Merge branch 'release/2026.01' into maxim/2025.07-Flat-UI

43 files changed, 649 insertions, 428 deletions

diff --git a/indra/llcommon/llapr.cpp b/indra/llcommon/llapr.cpp
index 01763c49aa..eeff2694a7 100644
--- a/indra/llcommon/llapr.cpp
+++ b/indra/llcommon/llapr.cpp
@@ -154,7 +154,7 @@ LLVolatileAPRPool::LLVolatileAPRPool(bool is_local, apr_pool_t *parent, apr_size
     //create mutex
     if(!is_local) //not a local apr_pool, that is: shared by multiple threads.
     {
-        mMutexp.reset(new std::mutex());
+        mMutexp = std::make_unique<std::mutex>();
     }
 }
 
diff --git a/indra/llcommon/llapr.h b/indra/llcommon/llapr.h
index 693cd7c01f..11e474b5dd 100644
--- a/indra/llcommon/llapr.h
+++ b/indra/llcommon/llapr.h
@@ -33,7 +33,6 @@
 #include <sys/param.h>  // Need PATH_MAX in APR headers...
 #endif
 
-#include <boost/noncopyable.hpp>
 #include "llwin32headers.h"
 #include "apr_thread_proc.h"
 #include "apr_getopt.h"
@@ -145,7 +144,7 @@ private:
 //      2, a global pool.
 //
 
-class LL_COMMON_API LLAPRFile : boost::noncopyable
+class LL_COMMON_API LLAPRFile
 {
     // make this non copyable since a copy closes the file
 private:
@@ -153,9 +152,12 @@ private:
     LLVolatileAPRPool *mCurrentFilePoolp ; //currently in use apr_pool, could be one of them: sAPRFilePoolp, or a temp pool.
 
 public:
-    LLAPRFile() ;
+    LLAPRFile();
     LLAPRFile(const std::string& filename, apr_int32_t flags, LLVolatileAPRPool* pool = NULL);
-    ~LLAPRFile() ;
+    ~LLAPRFile();
+
+    LLAPRFile(const LLAPRFile&) = delete;
+    LLAPRFile& operator=(const LLAPRFile&) = delete;
 
     apr_status_t open(const std::string& filename, apr_int32_t flags, LLVolatileAPRPool* pool = NULL, S32* sizep = NULL);
     apr_status_t open(const std::string& filename, apr_int32_t flags, bool use_global_pool); //use gAPRPoolp.
diff --git a/indra/llcommon/llcallbacklist.h b/indra/llcommon/llcallbacklist.h
index d6c415f7c5..036e575117 100644
--- a/indra/llcommon/llcallbacklist.h
+++ b/indra/llcommon/llcallbacklist.h
@@ -27,8 +27,9 @@
 #ifndef LL_LLCALLBACKLIST_H
 #define LL_LLCALLBACKLIST_H
 
-#include "llstl.h"
-#include <boost/function.hpp>
+#include "stdtypes.h"
+
+#include <functional>
 #include <list>
 
 class LLCallbackList
@@ -59,8 +60,8 @@ protected:
     callback_list_t mCallbackList;
 };
 
-typedef boost::function<void ()> nullary_func_t;
-typedef boost::function<bool ()> bool_func_t;
+typedef std::function<void ()> nullary_func_t;
+typedef std::function<bool ()> bool_func_t;
 
 // Call a given callable once in idle loop.
 void doOnIdleOneTime(nullary_func_t callable);
diff --git a/indra/llcommon/llcoros.h b/indra/llcommon/llcoros.h
index c3820ae987..9df52b6ed5 100644
--- a/indra/llcommon/llcoros.h
+++ b/indra/llcommon/llcoros.h
@@ -37,7 +37,7 @@
 #include "mutex.h"
 #include "llsingleton.h"
 #include "llinstancetracker.h"
-#include <boost/function.hpp>
+#include <functional>
 #include <string>
 #include <exception>
 #include <queue>
@@ -112,7 +112,7 @@ public:
     /// stuck with the term "coroutine."
     typedef boost::fibers::fiber coro;
     /// Canonical callable type
-    typedef boost::function<void()> callable_t;
+    typedef std::function<void()> callable_t;
 
     /**
      * Create and start running a new coroutine with specified name. The name
diff --git a/indra/llcommon/lldeadmantimer.h b/indra/llcommon/lldeadmantimer.h
index 3f10420d41..19d65b78b6 100644
--- a/indra/llcommon/lldeadmantimer.h
+++ b/indra/llcommon/lldeadmantimer.h
@@ -99,13 +99,10 @@ public:
     ///                 during updates.  If false, cpu usage data isn't
     ///                 collected and will be zero if queried.
     LLDeadmanTimer(F64 horizon, bool inc_cpu);
+    ~LLDeadmanTimer() = default;
 
-    ~LLDeadmanTimer()
-        {}
-
-private:
-    LLDeadmanTimer(const LLDeadmanTimer &);             // Not defined
-    void operator=(const LLDeadmanTimer &);             // Not defined
+    LLDeadmanTimer(const LLDeadmanTimer &) = delete;
+    LLDeadmanTimer& operator=(const LLDeadmanTimer&) = delete;
 
 public:
     /// Get the current time.  Zero-basis for this time
diff --git a/indra/llcommon/lldependencies.h b/indra/llcommon/lldependencies.h
index 47b6fedc7d..a1b5c83caf 100644
--- a/indra/llcommon/lldependencies.h
+++ b/indra/llcommon/lldependencies.h
@@ -30,6 +30,7 @@
 #if ! defined(LL_LLDEPENDENCIES_H)
 #define LL_LLDEPENDENCIES_H
 
+#include <functional>
 #include <string>
 #include <vector>
 #include <set>
@@ -38,7 +39,6 @@
 #include <boost/iterator/transform_iterator.hpp>
 #include <boost/iterator/indirect_iterator.hpp>
 #include <boost/range/iterator_range.hpp>
-#include <boost/function.hpp>
 #include <boost/bind.hpp>
 #include "llexception.h"
 
@@ -217,7 +217,7 @@ class LLDependencies: public LLDependenciesBase
     /// We have various ways to get the dependencies for a given DepNode.
     /// Rather than having to restate each one for 'after' and 'before'
     /// separately, pass a dep_selector so we can apply each to either.
-    typedef boost::function<const typename DepNode::dep_set&(const DepNode&)> dep_selector;
+    typedef std::function<const typename DepNode::dep_set&(const DepNode&)> dep_selector;
 
 public:
     LLDependencies() {}
@@ -340,7 +340,7 @@ private:
 
 public:
     /// iterator over value_type entries
-    typedef boost::transform_iterator<boost::function<value_type(DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<value_type(DepNodeMapEntry&)>,
                                       typename DepNodeMap::iterator> iterator;
     /// range over value_type entries
     typedef boost::iterator_range<iterator> range;
@@ -352,7 +352,7 @@ public:
     }
 
     /// iterator over const_value_type entries
-    typedef boost::transform_iterator<boost::function<const_value_type(const DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<const_value_type(const DepNodeMapEntry&)>,
                                       typename DepNodeMap::const_iterator> const_iterator;
     /// range over const_value_type entries
     typedef boost::iterator_range<const_iterator> const_range;
@@ -364,7 +364,7 @@ public:
     }
 
     /// iterator over stored NODEs
-    typedef boost::transform_iterator<boost::function<NODE&(DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<NODE&(DepNodeMapEntry&)>,
                                       typename DepNodeMap::iterator> node_iterator;
     /// range over stored NODEs
     typedef boost::iterator_range<node_iterator> node_range;
@@ -380,7 +380,7 @@ public:
     }
 
     /// const iterator over stored NODEs
-    typedef boost::transform_iterator<boost::function<const NODE&(const DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<const NODE&(const DepNodeMapEntry&)>,
                                       typename DepNodeMap::const_iterator> const_node_iterator;
     /// const range over stored NODEs
     typedef boost::iterator_range<const_node_iterator> const_node_range;
@@ -396,7 +396,7 @@ public:
     }
 
     /// const iterator over stored KEYs
-    typedef boost::transform_iterator<boost::function<const KEY&(const DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<const KEY&(const DepNodeMapEntry&)>,
                                       typename DepNodeMap::const_iterator> const_key_iterator;
     /// const range over stored KEYs
     typedef boost::iterator_range<const_key_iterator> const_key_range;
diff --git a/indra/llcommon/lldoubledispatch.h b/indra/llcommon/lldoubledispatch.h
index 25039c3e9c..ad4dc57d58 100644
--- a/indra/llcommon/lldoubledispatch.h
+++ b/indra/llcommon/lldoubledispatch.h
@@ -30,9 +30,7 @@
 #define LL_LLDOUBLEDISPATCH_H
 
 #include <list>
-#include <boost/function.hpp>
-#include <boost/bind.hpp>
-#include <boost/ref.hpp>
+#include <functional>
 
 /**
  * This class supports function calls which are virtual on the dynamic type of
@@ -156,9 +154,9 @@ public:
         insert(t1, t2, func);
         if (symmetrical)
         {
-            // Use boost::bind() to construct a param-swapping thunk. Don't
+            // Use std::bind() to construct a param-swapping thunk. Don't
             // forget to reverse the parameters too.
-            insert(t2, t1, boost::bind(func, _2, _1));
+            insert(t2, t1, std::bind(func, std::placeholders::_2, std::placeholders::_1));
         }
     }
 
@@ -193,7 +191,7 @@ public:
         insert(Type<Type1>(), Type<Type2>(), func, insertion);
         if (symmetrical)
         {
-            insert(Type<Type2>(), Type<Type1>(), boost::bind(func, _2, _1), insertion);
+            insert(Type<Type2>(), Type<Type1>(), std::bind(func, std::placeholders::_2, std::placeholders::_1), insertion);
         }
     }
 
@@ -271,8 +269,8 @@ private:
     typename DispatchTable::iterator find(const ParamBaseType& param1, const ParamBaseType& param2)
     {
         return std::find_if(mDispatch.begin(), mDispatch.end(),
-                            boost::bind(&EntryBase::matches, _1,
-                                        boost::ref(param1), boost::ref(param2)));
+                            std::bind(&EntryBase::matches, std::placeholders::_1,
+                                        std::ref(param1), std::ref(param2)));
     }
 
     /// Look up the first matching entry.
diff --git a/indra/llcommon/llerror.cpp b/indra/llcommon/llerror.cpp
index 3411e9c6bb..b14464382b 100644
--- a/indra/llcommon/llerror.cpp
+++ b/indra/llcommon/llerror.cpp
@@ -527,8 +527,8 @@ namespace
         mFileLevelMap(),
         mTagLevelMap(),
         mUniqueLogMessages(),
-        mCrashFunction(NULL),
-        mTimeFunction(NULL),
+        mCrashFunction(nullptr),
+        mTimeFunction(nullptr),
         mRecorders(),
         mShouldLogCallCounter(0)
     {
@@ -1231,7 +1231,7 @@ namespace
 
             std::ostringstream message_stream;
 
-            if (r->wantsTime() && s->mTimeFunction != NULL)
+            if (r->wantsTime() && s->mTimeFunction != nullptr)
             {
                 message_stream << s->mTimeFunction();
             }
diff --git a/indra/llcommon/llerrorcontrol.h b/indra/llcommon/llerrorcontrol.h
index 0a7b3d2046..d254fa5407 100644
--- a/indra/llcommon/llerrorcontrol.h
+++ b/indra/llcommon/llerrorcontrol.h
@@ -31,7 +31,7 @@
 #include "llerror.h"
 #include "llpointer.h"
 #include "llrefcount.h"
-#include "boost/function.hpp"
+#include <functional>
 #include <string>
 
 class LLSD;
@@ -92,7 +92,7 @@ namespace LLError
         Control functions.
     */
 
-    typedef boost::function<void(const std::string&)> FatalFunction;
+    typedef std::function<void(const std::string&)> FatalFunction;
 
     LL_COMMON_API void setFatalFunction(const FatalFunction&);
         // The fatal function will be called after an message of LEVEL_ERROR
diff --git a/indra/llcommon/lleventdispatcher.h b/indra/llcommon/lleventdispatcher.h
index 4c3c0f3414..97a60e2829 100644
--- a/indra/llcommon/lleventdispatcher.h
+++ b/indra/llcommon/lleventdispatcher.h
@@ -33,9 +33,7 @@
 #define LL_LLEVENTDISPATCHER_H
 
 #include <boost/fiber/fss.hpp>
-#include <boost/function_types/is_member_function_pointer.hpp>
 #include <boost/function_types/is_nonmember_callable_builtin.hpp>
-#include <boost/hof/is_invocable.hpp> // until C++17, when we get std::is_invocable
 #include <boost/iterator/transform_iterator.hpp>
 #include <functional>               // std::function
 #include <memory>                   // std::unique_ptr
@@ -99,7 +97,7 @@ public:
 
     template <typename CALLABLE,
               typename=typename std::enable_if<
-                  boost::hof::is_invocable<CALLABLE, LLSD>::value
+                  std::is_invocable<CALLABLE, LLSD>::value
              >::type>
     void add(const std::string& name,
              const std::string& desc,
@@ -295,9 +293,8 @@ public:
      * converted to the corresponding parameter type using LLSDParam.
      */
     template <typename CALLABLE,
-              typename=typename std::enable_if<
-                  ! boost::hof::is_invocable<CALLABLE, LLSD>()
-             >::type>
+              typename=typename std::enable_if_t<
+                  ! std::is_invocable<CALLABLE, LLSD>()>>
     void add(const std::string& name,
              const std::string& desc,
              CALLABLE&& f)
@@ -318,7 +315,7 @@ public:
      */
     template<typename Method, typename InstanceGetter,
              typename = typename std::enable_if<
-                 boost::function_types::is_member_function_pointer<Method>::value &&
+                 std::is_member_function_pointer<Method>::value &&
                  ! std::is_convertible<InstanceGetter, LLSD>::value
              >::type>
     void add(const std::string& name, const std::string& desc, Method f,
@@ -338,7 +335,7 @@ public:
     template<typename Function,
              typename = typename std::enable_if<
                  boost::function_types::is_nonmember_callable_builtin<Function>::value &&
-                 ! boost::hof::is_invocable<Function, LLSD>::value
+                 ! std::is_invocable<Function, LLSD>::value
              >::type>
     void add(const std::string& name, const std::string& desc, Function f,
              const LLSD& params, const LLSD& defaults=LLSD());
@@ -364,7 +361,7 @@ public:
      */
     template<typename Method, typename InstanceGetter,
              typename = typename std::enable_if<
-                 boost::function_types::is_member_function_pointer<Method>::value &&
+                 std::is_member_function_pointer<Method>::value &&
                  ! std::is_convertible<InstanceGetter, LLSD>::value
              >::type>
     void add(const std::string& name, const std::string& desc, Method f,
diff --git a/indra/llcommon/lleventfilter.h b/indra/llcommon/lleventfilter.h
index d8c7e15a27..8b917c23be 100644
--- a/indra/llcommon/lleventfilter.h
+++ b/indra/llcommon/lleventfilter.h
@@ -33,7 +33,8 @@
 #include "stdtypes.h"
 #include "lltimer.h"
 #include "llsdutil.h"
-#include <boost/function.hpp>
+
+#include <functional>
 
 class LLEventTimer;
 class LLDate;
@@ -92,8 +93,8 @@ public:
     /// construct and connect
     LLEventTimeoutBase(LLEventPump& source);
 
-    /// Callable, can be constructed with boost::bind()
-    typedef boost::function<void()> Action;
+    /// Callable, can be constructed with std::bind()
+    typedef std::function<void()> Action;
 
     /**
      * Start countdown timer for the specified number of @a seconds. Forward
diff --git a/indra/llcommon/llevents.cpp b/indra/llcommon/llevents.cpp
index 3c6743eac9..9a5324b598 100644
--- a/indra/llcommon/llevents.cpp
+++ b/indra/llcommon/llevents.cpp
@@ -44,7 +44,6 @@
 #include <cmath>
 #include <cctype>
 // external library headers
-#include <boost/range/iterator_range.hpp>
 #if LL_WINDOWS
 #pragma warning (push)
 #pragma warning (disable : 4701) // compiler thinks might use uninitialized var, but no
diff --git a/indra/llcommon/llevents.h b/indra/llcommon/llevents.h
index 4bf1fa07a2..18c05a0081 100644
--- a/indra/llcommon/llevents.h
+++ b/indra/llcommon/llevents.h
@@ -41,11 +41,7 @@
 
 #include <boost/signals2.hpp>
 #include <boost/bind.hpp>
-#include <boost/utility.hpp>        // noncopyable
 #include <boost/optional/optional.hpp>
-#include <boost/visit_each.hpp>
-#include <boost/ref.hpp>            // reference_wrapper
-#include <boost/type_traits/is_pointer.hpp>
 #include <boost/static_assert.hpp>
 #include "llsd.h"
 #include "llsingleton.h"
diff --git a/indra/llcommon/llfile.cpp b/indra/llcommon/llfile.cpp
index 53659ac13f..a539e4fe28 100644
--- a/indra/llcommon/llfile.cpp
+++ b/indra/llcommon/llfile.cpp
@@ -35,7 +35,6 @@
 
 #if LL_WINDOWS
 #include "llwin32headers.h"
-#include <stdlib.h>                 // Windows errno
 #include <vector>
 #else
 #include <errno.h>
@@ -49,6 +48,86 @@ static std::string empty;
 // variants of strerror() to report errors.
 
 #if LL_WINDOWS
+// For the situations where we directly call into Windows API functions we need to translate
+// the Windows error codes into errno values
+namespace
+{
+    struct errentry
+    {
+        unsigned long oserr; // Windows OS error value
+        int errcode;         // System V error code
+    };
+}
+
+// translation table between Windows OS error value and System V errno code
+static errentry const errtable[]
+{
+    { ERROR_INVALID_FUNCTION,       EINVAL    },  //    1
+    { ERROR_FILE_NOT_FOUND,         ENOENT    },  //    2
+    { ERROR_PATH_NOT_FOUND,         ENOENT    },  //    3
+    { ERROR_TOO_MANY_OPEN_FILES,    EMFILE    },  //    4
+    { ERROR_ACCESS_DENIED,          EACCES    },  //    5
+    { ERROR_INVALID_HANDLE,         EBADF     },  //    6
+    { ERROR_ARENA_TRASHED,          ENOMEM    },  //    7
+    { ERROR_NOT_ENOUGH_MEMORY,      ENOMEM    },  //    8
+    { ERROR_INVALID_BLOCK,          ENOMEM    },  //    9
+    { ERROR_BAD_ENVIRONMENT,        E2BIG     },  //   10
+    { ERROR_BAD_FORMAT,             ENOEXEC   },  //   11
+    { ERROR_INVALID_ACCESS,         EINVAL    },  //   12
+    { ERROR_INVALID_DATA,           EINVAL    },  //   13
+    { ERROR_INVALID_DRIVE,          ENOENT    },  //   15
+    { ERROR_CURRENT_DIRECTORY,      EACCES    },  //   16
+    { ERROR_NOT_SAME_DEVICE,        EXDEV     },  //   17
+    { ERROR_NO_MORE_FILES,          ENOENT    },  //   18
+    { ERROR_LOCK_VIOLATION,         EACCES    },  //   33
+    { ERROR_BAD_NETPATH,            ENOENT    },  //   53
+    { ERROR_NETWORK_ACCESS_DENIED,  EACCES    },  //   65
+    { ERROR_BAD_NET_NAME,           ENOENT    },  //   67
+    { ERROR_FILE_EXISTS,            EEXIST    },  //   80
+    { ERROR_CANNOT_MAKE,            EACCES    },  //   82
+    { ERROR_FAIL_I24,               EACCES    },  //   83
+    { ERROR_INVALID_PARAMETER,      EINVAL    },  //   87
+    { ERROR_NO_PROC_SLOTS,          EAGAIN    },  //   89
+    { ERROR_DRIVE_LOCKED,           EACCES    },  //  108
+    { ERROR_BROKEN_PIPE,            EPIPE     },  //  109
+    { ERROR_DISK_FULL,              ENOSPC    },  //  112
+    { ERROR_INVALID_TARGET_HANDLE,  EBADF     },  //  114
+    { ERROR_WAIT_NO_CHILDREN,       ECHILD    },  //  128
+    { ERROR_CHILD_NOT_COMPLETE,     ECHILD    },  //  129
+    { ERROR_DIRECT_ACCESS_HANDLE,   EBADF     },  //  130
+    { ERROR_NEGATIVE_SEEK,          EINVAL    },  //  131
+    { ERROR_SEEK_ON_DEVICE,         EACCES    },  //  132
+    { ERROR_DIR_NOT_EMPTY,          ENOTEMPTY },  //  145
+    { ERROR_NOT_LOCKED,             EACCES    },  //  158
+    { ERROR_BAD_PATHNAME,           ENOENT    },  //  161
+    { ERROR_MAX_THRDS_REACHED,      EAGAIN    },  //  164
+    { ERROR_LOCK_FAILED,            EACCES    },  //  167
+    { ERROR_ALREADY_EXISTS,         EEXIST    },  //  183
+    { ERROR_FILENAME_EXCED_RANGE,   ENOENT    },  //  206
+    { ERROR_NESTING_NOT_ALLOWED,    EAGAIN    },  //  215
+    { ERROR_NO_UNICODE_TRANSLATION, EILSEQ    },  // 1113
+    { ERROR_NOT_ENOUGH_QUOTA,       ENOMEM    }   // 1816
+};
+
+static int set_errno_from_oserror(unsigned long oserr)
+{
+    if (!oserr)
+        return 0;
+
+    // Check the table for the Windows OS error code
+    for (const struct errentry &entry : errtable)
+    {
+        if (oserr == entry.oserr)
+        {
+            _set_errno(entry.errcode);
+            return -1;
+        }
+    }
+
+    _set_errno(EINVAL);
+    return -1;
+}
+
 // On Windows, use strerror_s().
 std::string strerr(int errn)
 {
@@ -57,7 +136,67 @@ std::string strerr(int errn)
     return buffer;
 }
 
-typedef std::basic_ios<char,std::char_traits < char > > _Myios;
+inline bool is_slash(wchar_t const c)
+{
+    return c == L'\\' || c == L'/';
+}
+
+static std::wstring utf8path_to_wstring(const std::string& utf8path)
+{
+    if (utf8path.size() >= MAX_PATH)
+    {
+        // By prepending "\\?\" to a path, Windows widechar file APIs will not fail on long path names
+        std::wstring utf16path = L"\\\\?\\" + ll_convert<std::wstring>(utf8path);
+        // We need to make sure that the path does not contain forward slashes as above
+        // prefix does bypass the path normalization that replaces slashes with backslashes
+        // before passing the path to kernel mode APIs
+        std::replace(utf16path.begin(), utf16path.end(), L'/', L'\\');
+        return utf16path;
+    }
+    return ll_convert<std::wstring>(utf8path);
+}
+
+static unsigned short get_fileattr(const std::wstring& utf16path, bool dontFollowSymLink = false)
+{
+    unsigned long  flags = FILE_FLAG_BACKUP_SEMANTICS;
+    if (dontFollowSymLink)
+    {
+        flags |= FILE_FLAG_OPEN_REPARSE_POINT;
+    }
+    HANDLE file_handle = CreateFileW(utf16path.c_str(), FILE_READ_ATTRIBUTES,
+                                     FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
+                                     nullptr, OPEN_EXISTING, flags, nullptr);
+    if (file_handle != INVALID_HANDLE_VALUE)
+    {
+        FILE_ATTRIBUTE_TAG_INFO attribute_info;
+        if (GetFileInformationByHandleEx(file_handle, FileAttributeTagInfo, &attribute_info, sizeof(attribute_info)))
+        {
+            // A volume path alone (only drive letter) is not recognized as directory while it technically is
+            bool is_directory = (attribute_info.FileAttributes & FILE_ATTRIBUTE_DIRECTORY) ||
+                                (iswalpha(utf16path[0]) && utf16path[1] == ':' &&
+                                 (!utf16path[2] || (is_slash(utf16path[2]) && !utf16path[3])));
+            unsigned short st_mode = is_directory ? S_IFDIR :
+                                     (attribute_info.FileAttributes & FILE_ATTRIBUTE_REPARSE_POINT ? S_IFLNK : S_IFREG);
+            st_mode |= (attribute_info.FileAttributes & FILE_ATTRIBUTE_READONLY) ? S_IREAD : S_IREAD | S_IWRITE;
+            // we do not try to guess executable flag
+
+            // propagate user bits to group/other fields:
+            st_mode |= (st_mode & 0700) >> 3;
+            st_mode |= (st_mode & 0700) >> 6;
+
+            CloseHandle(file_handle);
+            return st_mode;
+        }
+    }
+    // Retrieve last error and set errno before calling CloseHandle()
+    set_errno_from_oserror(GetLastError());
+
+    if (file_handle != INVALID_HANDLE_VALUE)
+    {
+        CloseHandle(file_handle);
+    }
+    return 0;
+}
 
 #else
 // On Posix we want to call strerror_r(), but alarmingly, there are two
@@ -108,18 +247,13 @@ std::string strerr(int errn)
 }
 #endif  // ! LL_WINDOWS
 
-// On either system, shorthand call just infers global 'errno'.
-std::string strerr()
-{
-    return strerr(errno);
-}
-
-int warnif(const std::string& desc, const std::string& filename, int rc, int accept=0)
+static int warnif(const std::string& desc, const std::string& filename, int rc, int accept = 0)
 {
     if (rc < 0)
     {
         // Capture errno before we start emitting output
         int errn = errno;
+
         // For certain operations, a particular errno value might be
         // acceptable -- e.g. stat() could permit ENOENT, mkdir() could permit
         // EEXIST. Don't warn if caller explicitly says this errno is okay.
@@ -176,62 +310,59 @@ int warnif(const std::string& desc, const std::string& filename, int rc, int acc
 // static
 int LLFile::mkdir(const std::string& dirname, int perms)
 {
+    // We often use mkdir() to ensure the existence of a directory that might
+    // already exist. There is no known case in which we want to call out as
+    // an error the requested directory already existing.
 #if LL_WINDOWS
     // permissions are ignored on Windows
-    std::wstring utf16dirname = ll_convert<std::wstring>(dirname);
-    int rc = _wmkdir(utf16dirname.c_str());
+    int rc = 0;
+    std::wstring utf16dirname = utf8path_to_wstring(dirname);
+    if (!CreateDirectoryW(utf16dirname.c_str(), nullptr))
+    {
+        // Only treat other errors than an already existing file as a real error
+        unsigned long oserr = GetLastError();
+        if (oserr != ERROR_ALREADY_EXISTS)
+        {
+            rc = set_errno_from_oserror(oserr);
+        }
+    }
 #else
     int rc = ::mkdir(dirname.c_str(), (mode_t)perms);
-#endif
-    // We often use mkdir() to ensure the existence of a directory that might
-    // already exist. There is no known case in which we want to call out as
-    // an error the requested directory already existing.
     if (rc < 0 && errno == EEXIST)
     {
         // this is not the error you want, move along
         return 0;
     }
+#endif
     // anything else might be a problem
-    return warnif("mkdir", dirname, rc, EEXIST);
+    return warnif("mkdir", dirname, rc);
 }
 
 // static
-int LLFile::rmdir(const std::string& dirname)
+int LLFile::rmdir(const std::string& dirname, int suppress_error)
 {
 #if LL_WINDOWS
-    // permissions are ignored on Windows
-    std::wstring utf16dirname = ll_convert<std::wstring>(dirname);
+    std::wstring utf16dirname = utf8path_to_wstring(dirname);
     int rc = _wrmdir(utf16dirname.c_str());
 #else
     int rc = ::rmdir(dirname.c_str());
 #endif
-    return warnif("rmdir", dirname, rc);
+    return warnif("rmdir", dirname, rc, suppress_error);
 }
 
 // static
-LLFILE* LLFile::fopen(const std::string& filename, const char* mode)    /* Flawfinder: ignore */
-{
-#if LL_WINDOWS
-    std::wstring utf16filename = ll_convert<std::wstring>(filename);
-    std::wstring utf16mode = ll_convert<std::wstring>(std::string(mode));
-    return _wfopen(utf16filename.c_str(),utf16mode.c_str());
-#else
-    return ::fopen(filename.c_str(),mode);  /* Flawfinder: ignore */
-#endif
-}
-
-LLFILE* LLFile::_fsopen(const std::string& filename, const char* mode, int sharingFlag)
+LLFILE* LLFile::fopen(const std::string& filename, const char* mode)
 {
 #if LL_WINDOWS
-    std::wstring utf16filename = ll_convert<std::wstring>(filename);
+    std::wstring utf16filename = utf8path_to_wstring(filename);
     std::wstring utf16mode = ll_convert<std::wstring>(std::string(mode));
-    return _wfsopen(utf16filename.c_str(),utf16mode.c_str(),sharingFlag);
+    return _wfopen(utf16filename.c_str(), utf16mode.c_str());
 #else
-    llassert(0);//No corresponding function on non-windows
-    return NULL;
+    return ::fopen(filename.c_str(),mode);
 #endif
 }
 
+// static
 int LLFile::close(LLFILE * file)
 {
     int ret_value = 0;
@@ -242,9 +373,10 @@ int LLFile::close(LLFILE * file)
     return ret_value;
 }
 
+// static
 std::string LLFile::getContents(const std::string& filename)
 {
-    LLFILE* fp = fopen(filename, "rb"); /* Flawfinder: ignore */
+    LLFILE* fp = LLFile::fopen(filename, "rb");
     if (fp)
     {
         fseek(fp, 0, SEEK_END);
@@ -261,42 +393,80 @@ std::string LLFile::getContents(const std::string& filename)
     return LLStringUtil::null;
 }
 
-int LLFile::remove(const std::string& filename, int supress_error)
+// static
+int LLFile::remove(const std::string& filename, int suppress_error)
 {
 #if LL_WINDOWS
-    std::wstring utf16filename = ll_convert<std::wstring>(filename);
-    int rc = _wremove(utf16filename.c_str());
+    // Posix remove() works on both files and directories although on Windows
+    // remove() and its wide char variant _wremove() only removes files just
+    // as its siblings unlink() and _wunlink().
+    // If we really only want to support files we should instead use
+    // unlink() in the non-Windows part below too
+    int rc = -1;
+    std::wstring utf16filename = utf8path_to_wstring(filename);
+    unsigned short st_mode = get_fileattr(utf16filename);
+    if (S_ISDIR(st_mode))
+    {
+        rc = _wrmdir(utf16filename.c_str());
+    }
+    else if (S_ISREG(st_mode))
+    {
+        rc = _wunlink(utf16filename.c_str());
+    }
+    else if (st_mode)
+    {
+        // it is something else than a file or directory
+        // this should not really happen as long as we do not allow for symlink
+        // detection in the optional parameter to get_fileattr()
+        rc = set_errno_from_oserror(ERROR_INVALID_PARAMETER);
+    }
+    else
+    {
+        // get_fileattr() failed and already set errno, preserve it for correct error reporting
+    }
 #else
     int rc = ::remove(filename.c_str());
 #endif
-    return warnif("remove", filename, rc, supress_error);
+    return warnif("remove", filename, rc, suppress_error);
 }
 
-int LLFile::rename(const std::string& filename, const std::string& newname, int supress_error)
+// static
+int LLFile::rename(const std::string& filename, const std::string& newname, int suppress_error)
 {
 #if LL_WINDOWS
-    std::wstring utf16filename = ll_convert<std::wstring>(filename);
-    std::wstring utf16newname = ll_convert<std::wstring>(newname);
-    int rc = _wrename(utf16filename.c_str(),utf16newname.c_str());
+    // Posix rename() will gladly overwrite a file at newname if it exists, the Windows
+    // rename(), respectively _wrename(), will bark on that. Instead call directly the Windows
+    // API MoveFileEx() and use its flags to specify that overwrite is allowed.
+    std::wstring utf16filename = utf8path_to_wstring(filename);
+    std::wstring utf16newname = utf8path_to_wstring(newname);
+    int rc = 0;
+    if (!MoveFileExW(utf16filename.c_str(), utf16newname.c_str(), MOVEFILE_REPLACE_EXISTING | MOVEFILE_COPY_ALLOWED))
+    {
+        rc = set_errno_from_oserror(GetLastError());
+    }
 #else
     int rc = ::rename(filename.c_str(),newname.c_str());
 #endif
-    return warnif(STRINGIZE("rename to '" << newname << "' from"), filename, rc, supress_error);
+    return warnif(STRINGIZE("rename to '" << newname << "' from"), filename, rc, suppress_error);
 }
 
+// Make this a define rather than using magic numbers multiple times in the code
+#define LLFILE_COPY_BUFFER_SIZE 16384
+
+// static
 bool LLFile::copy(const std::string& from, const std::string& to)
 {
     bool copied = false;
-    LLFILE* in = LLFile::fopen(from, "rb");     /* Flawfinder: ignore */
+    LLFILE* in = LLFile::fopen(from, "rb");
     if (in)
     {
-        LLFILE* out = LLFile::fopen(to, "wb");      /* Flawfinder: ignore */
+        LLFILE* out = LLFile::fopen(to, "wb");
         if (out)
         {
-            char buf[16384];        /* Flawfinder: ignore */
+            char buf[LLFILE_COPY_BUFFER_SIZE];
             size_t readbytes;
             bool write_ok = true;
-            while(write_ok && (readbytes = fread(buf, 1, 16384, in))) /* Flawfinder: ignore */
+            while (write_ok && (readbytes = fread(buf, 1, LLFILE_COPY_BUFFER_SIZE, in)))
             {
                 if (fwrite(buf, 1, readbytes, out) != readbytes)
                 {
@@ -315,33 +485,62 @@ bool LLFile::copy(const std::string& from, const std::string& to)
     return copied;
 }
 
-int LLFile::stat(const std::string& filename, llstat* filestatus)
+// static
+int LLFile::stat(const std::string& filename, llstat* filestatus, int suppress_error)
 {
 #if LL_WINDOWS
-    std::wstring utf16filename = ll_convert<std::wstring>(filename);
-    int rc = _wstat(utf16filename.c_str(),filestatus);
+    std::wstring utf16filename = utf8path_to_wstring(filename);
+    int rc = _wstat64(utf16filename.c_str(), filestatus);
 #else
-    int rc = ::stat(filename.c_str(),filestatus);
+    int rc = ::stat(filename.c_str(), filestatus);
 #endif
-    // We use stat() to determine existence (see isfile(), isdir()).
-    // Don't spam the log if the subject pathname doesn't exist.
-    return warnif("stat", filename, rc, ENOENT);
+    return warnif("stat", filename, rc, suppress_error);
 }
 
-bool LLFile::isdir(const std::string& filename)
+// static
+unsigned short LLFile::getattr(const std::string& filename, bool dontFollowSymLink, int suppress_error)
 {
-    llstat st;
+#if LL_WINDOWS
+    // _wstat64() is a bit heavyweight on Windows, use a more lightweight API
+    // to just get the attributes
+    int rc = -1;
+    std::wstring utf16filename = utf8path_to_wstring(filename);
+    unsigned short st_mode = get_fileattr(utf16filename, dontFollowSymLink);
+    if (st_mode)
+    {
+        return st_mode;
+    }
+#else
+    llstat filestatus;
+    int rc = dontFollowSymLink ? ::lstat(filename.c_str(), &filestatus) : ::stat(filename.c_str(), &filestatus);
+    if (rc == 0)
+    {
+        return filestatus.st_mode;
+    }
+#endif
+    warnif("getattr", filename, rc, suppress_error);
+    return 0;
+}
 
-    return stat(filename, &st) == 0 && S_ISDIR(st.st_mode);
+// static
+bool LLFile::isdir(const std::string& filename)
+{
+    return S_ISDIR(getattr(filename));
 }
 
+// static
 bool LLFile::isfile(const std::string& filename)
 {
-    llstat st;
+    return S_ISREG(getattr(filename));
+}
 
-    return stat(filename, &st) == 0 && S_ISREG(st.st_mode);
+// static
+bool LLFile::islink(const std::string& filename)
+{
+    return S_ISLNK(getattr(filename, true));
 }
 
+// static
 const char *LLFile::tmpdir()
 {
     static std::string utf8path;
@@ -368,75 +567,8 @@ const char *LLFile::tmpdir()
     return utf8path.c_str();
 }
 
-
-/***************** Modified file stream created to overcome the incorrect behaviour of posix fopen in windows *******************/
-
 #if LL_WINDOWS
 
-LLFILE *    LLFile::_Fiopen(const std::string& filename,
-        std::ios::openmode mode)
-{   // open a file
-    static const char *mods[] =
-    {   // fopen mode strings corresponding to valid[i]
-    "r", "w", "w", "a", "rb", "wb", "wb", "ab",
-    "r+", "w+", "a+", "r+b", "w+b", "a+b",
-    0};
-    static const int valid[] =
-    {   // valid combinations of open flags
-        ios_base::in,
-        ios_base::out,
-        ios_base::out | ios_base::trunc,
-        ios_base::out | ios_base::app,
-        ios_base::in | ios_base::binary,
-        ios_base::out | ios_base::binary,
-        ios_base::out | ios_base::trunc | ios_base::binary,
-        ios_base::out | ios_base::app | ios_base::binary,
-        ios_base::in | ios_base::out,
-        ios_base::in | ios_base::out | ios_base::trunc,
-        ios_base::in | ios_base::out | ios_base::app,
-        ios_base::in | ios_base::out | ios_base::binary,
-        ios_base::in | ios_base::out | ios_base::trunc
-            | ios_base::binary,
-        ios_base::in | ios_base::out | ios_base::app
-            | ios_base::binary,
-    0};
-
-    LLFILE *fp = 0;
-    int n;
-    ios_base::openmode atendflag = mode & ios_base::ate;
-    ios_base::openmode norepflag = mode & ios_base::_Noreplace;
-
-    if (mode & ios_base::_Nocreate)
-        mode |= ios_base::in;   // file must exist
-    mode &= ~(ios_base::ate | ios_base::_Nocreate | ios_base::_Noreplace);
-    for (n = 0; valid[n] != 0 && valid[n] != mode; ++n)
-        ;   // look for a valid mode
-
-    if (valid[n] == 0)
-        return (0); // no valid mode
-    else if (norepflag && mode & (ios_base::out | ios_base::app)
-        && (fp = LLFile::fopen(filename, "r")) != 0)    /* Flawfinder: ignore */
-        {   // file must not exist, close and fail
-        fclose(fp);
-        return (0);
-        }
-    else if (fp != 0 && fclose(fp) != 0)
-        return (0); // can't close after test open
-// should open with protection here, if other than default
-    else if ((fp = LLFile::fopen(filename, mods[n])) == 0)  /* Flawfinder: ignore */
-        return (0); // open failed
-
-    if (!atendflag || fseek(fp, 0, SEEK_END) == 0)
-        return (fp);    // no need to seek to end, or seek succeeded
-
-    fclose(fp); // can't position at end
-    return (0);
-}
-
-#endif /* LL_WINDOWS */
-
-
-#if LL_WINDOWS
 /************** input file stream ********************************/
 
 llifstream::llifstream() {}
diff --git a/indra/llcommon/llfile.h b/indra/llcommon/llfile.h
index 1661cbeb55..04a2946ac4 100644
--- a/indra/llcommon/llfile.h
+++ b/indra/llcommon/llfile.h
@@ -41,8 +41,9 @@ typedef FILE    LLFILE;
 #include <sys/stat.h>
 
 #if LL_WINDOWS
-// windows version of stat function and stat data structure are called _stat
-typedef struct _stat    llstat;
+// The Windows version of stat function and stat data structure are called _stat64
+// We use _stat64 here to support 64-bit st_size and time_t values
+typedef struct _stat64  llstat;
 #else
 typedef struct stat     llstat;
 #include <sys/types.h>
@@ -56,35 +57,110 @@ typedef struct stat     llstat;
 # define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
 #endif
 
+// Windows C runtime library does not define this and does not support symlink detection in the
+// stat functions but we do in our getattr() function
+#ifndef S_IFLNK
+#define S_IFLNK 0xA000 /* symlink */
+#endif
+
+#ifndef S_ISLNK
+#define S_ISLNK(x) (((x) & S_IFMT) == S_IFLNK)
+#endif
+
 #include "llstring.h" // safe char* -> std::string conversion
 
+/// LLFile is a class of static functions operating on paths
+/// All the functions with a path string input take UTF8 path/filenames
 class LL_COMMON_API LLFile
 {
 public:
-    // All these functions take UTF8 path/filenames.
-    static  LLFILE* fopen(const std::string& filename,const char* accessmode);  /* Flawfinder: ignore */
-    static  LLFILE* _fsopen(const std::string& filename,const char* accessmode,int  sharingFlag);
+    /// open a file with the specified access mode
+    static  LLFILE* fopen(const std::string& filename, const char* accessmode);  /* Flawfinder: ignore */
+    ///< 'accessmode' follows the rules of the Posix fopen() mode parameter
+    /// "r" open the file for reading only and positions the stream at the beginning
+    /// "r+" open the file for reading and writing and positions the stream at the beginning
+    /// "w" open the file for reading and writing and truncate it to zero length
+    /// "w+" open or create the file for reading and writing and truncate to zero length if it existed
+    /// "a" open the file for reading and writing and position the stream at the end of the file
+    /// "a+" open or create the file for reading and writing and position the stream at the end of the file
+    ///
+    /// in addition to these values, "b" can be appended to indicate binary stream access, but on Linux and Mac
+    /// this is strictly for compatibility and has no effect. On Windows this makes the file functions not
+    /// try to translate line endings. Windows also allows to append "t" to indicate text mode. If neither
+    /// "b" or "t" is defined, Windows uses the value set by _fmode which by default is _O_TEXT.
+    /// This means that it is always a good idea to append "b" specifically for binary file access to
+    /// avoid corruption of the binary consistency of the data stream when reading or writing
+    /// Other characters in 'accessmode' will usually cause an error as fopen will verify this parameter
+    /// @returns a valid LLFILE* pointer on success or NULL on failure
 
     static  int     close(LLFILE * file);
 
+    /// retrieve the content of a file into a string
     static std::string getContents(const std::string& filename);
+    ///< @returns the content of the file or an empty string on failure
 
-    // perms is a permissions mask like 0777 or 0700.  In most cases it will
-    // be overridden by the user's umask.  It is ignored on Windows.
-    // mkdir() considers "directory already exists" to be SUCCESS.
+    /// create a directory
     static  int     mkdir(const std::string& filename, int perms = 0700);
+    ///< perms is a permissions mask like 0777 or 0700.  In most cases it will be
+    ///  overridden by the user's umask. It is ignored on Windows.
+    ///  mkdir() considers "directory already exists" to be not an error.
+    ///  @returns 0 on success and -1 on failure.
+
+    //// remove a directory
+    static  int     rmdir(const std::string& filename, int suppress_error = 0);
+    ///< pass ENOENT in the optional 'suppress_error' parameter
+    ///  if you don't want a warning in the log when the directory does not exist
+    ///  @returns 0 on success and -1 on failure.
+
+    /// remove a file or directory
+    static  int     remove(const std::string& filename, int suppress_error = 0);
+    ///< pass ENOENT in the optional 'suppress_error' parameter
+    ///  if you don't want a warning in the log when the directory does not exist
+    ///  @returns 0 on success and -1 on failure.
 
-    static  int     rmdir(const std::string& filename);
-    static  int     remove(const std::string& filename, int supress_error = 0);
-    static  int     rename(const std::string& filename,const std::string& newname, int supress_error = 0);
+    /// rename a file
+    static  int     rename(const std::string& filename, const std::string& newname, int suppress_error = 0);
+    ///< it will silently overwrite newname if it exists without returning an error
+    ///  Posix guarantees that if newname already exists, then there will be no moment
+    ///  in which for other processes newname does not exist. There is no such guarantee
+    ///  under Windows at this time. It may do it in the same way but the used Windows API
+    ///  does not make such guarantees.
+    ///  @returns 0 on success and -1 on failure.
+
+
+    /// copy the contents of file from 'from' to 'to' filename
     static  bool    copy(const std::string& from, const std::string& to);
+    ///< @returns true on success and false on failure.
+
+    /// return the file stat structure for filename
+    static  int     stat(const std::string& filename, llstat* file_status, int suppress_error = ENOENT);
+    ///< for compatibility with existing uses of LL_File::stat() we use ENOENT as default in the
+    ///  optional 'suppress_error' parameter to avoid spamming the log with warnings when the API
+    ///  is used to detect if a file exists
+    ///  @returns 0 on success and -1 on failure.
+
+    /// get the file or directory attributes for filename
+    static  unsigned short getattr(const std::string& filename, bool dontFollowSymLink = false, int suppress_error = ENOENT);
+    ///< a more lightweight function on Windows to stat, that just returns the file attribute flags
+    ///  dontFollowSymLinks set to true returns the attributes of the symlink if it is one, rather than resolving it
+    ///  we pass by default ENOENT in the optional 'suppress_error' parameter to not spam the log with
+    ///  warnings when the file or directory does not exist
+    ///  @returns 0 on failure and a st_mode value with either S_IFDIR or S_IFREG set otherwise
+    ///  together with the three access bits which under Windows only the write bit is relevant.
+
+    /// check if filename is an existing directory
+    static  bool    isdir(const std::string& filename);
+    ///< @returns true if the path is for an existing directory
+
+    /// check if filename is an existing file
+    static  bool    isfile(const std::string& filename);
+    ///< @returns true if the path is for an existing file
 
-    static  int     stat(const std::string& filename,llstat*    file_status);
-    static  bool    isdir(const std::string&    filename);
-    static  bool    isfile(const std::string&   filename);
-    static  LLFILE *    _Fiopen(const std::string& filename,
-            std::ios::openmode mode);
+    /// check if filename is a symlink
+    static  bool    islink(const std::string& filename);
+    ///< @returns true if the path is pointing at a symlink
 
+    /// return a path to the temporary directory on the system
     static  const char * tmpdir();
 };
 
diff --git a/indra/llcommon/llhandle.h b/indra/llcommon/llhandle.h
index ceea1d9c48..fd7d32e79a 100644
--- a/indra/llcommon/llhandle.h
+++ b/indra/llcommon/llhandle.h
@@ -31,8 +31,6 @@
 #include "llrefcount.h"
 #include "llexception.h"
 #include <stdexcept>
-#include <boost/type_traits/is_convertible.hpp>
-#include <boost/utility/enable_if.hpp>
 #include <boost/throw_exception.hpp>
 
 /**
@@ -90,7 +88,7 @@ public:
     LLHandle() : mTombStone(getDefaultTombStone()) {}
 
     template<typename U>
-    LLHandle(const LLHandle<U>& other, typename boost::enable_if< typename boost::is_convertible<U*, T*> >::type* dummy = 0)
+    LLHandle(const LLHandle<U>& other, typename std::enable_if_t<std::is_convertible_v<U*, T*>>* dummy = 0)
     : mTombStone(other.mTombStone)
     {}
 
@@ -199,7 +197,7 @@ public:
     }
 
     template <typename U>
-    LLHandle<U> getDerivedHandle(typename boost::enable_if< typename boost::is_convertible<U*, T*> >::type* dummy = 0) const
+    LLHandle<U> getDerivedHandle(typename std::enable_if_t<std::is_convertible_v<U*, T*> >* dummy = 0) const
     {
         LLHandle<U> downcast_handle;
         downcast_handle.mTombStone = getHandle().mTombStone;
diff --git a/indra/llcommon/llinitdestroyclass.h b/indra/llcommon/llinitdestroyclass.h
index 2354c9f2ed..7cc9c6b930 100644
--- a/indra/llcommon/llinitdestroyclass.h
+++ b/indra/llcommon/llinitdestroyclass.h
@@ -37,7 +37,7 @@
 #define LL_LLINITDESTROYCLASS_H
 
 #include "llsingleton.h"
-#include <boost/function.hpp>
+#include <functional>
 #include <typeinfo>
 #include <vector>
 #include <utility>                  // std::pair
@@ -50,7 +50,7 @@
 class LLCallbackRegistry
 {
 public:
-    typedef boost::function<void()> func_t;
+    typedef std::function<void()> func_t;
 
     void registerCallback(const std::string& name, const func_t& func)
     {
diff --git a/indra/llcommon/llinitparam.h b/indra/llcommon/llinitparam.h
index 32d7b17034..b01ea0bfb1 100644
--- a/indra/llcommon/llinitparam.h
+++ b/indra/llcommon/llinitparam.h
@@ -28,11 +28,12 @@
 #ifndef LL_LLPARAM_H
 #define LL_LLPARAM_H
 
+#include <functional>
+#include <type_traits>
 #include <vector>
 #include <list>
+#include <unordered_map>
 #include <boost/function.hpp>
-#include <boost/type_traits/is_convertible.hpp>
-#include <boost/type_traits/is_enum.hpp>
 #include <boost/unordered_map.hpp>
 
 #include "llerror.h"
@@ -105,6 +106,26 @@ namespace LLTypeTags
     };
 }
 
+namespace ll
+{
+    // Primary template: general case is false
+    template<typename T>
+    struct is_std_function : std::false_type
+    {
+    };
+
+    // Specialization for std::function
+    // R is the return type, Args is a parameter pack for argument types
+    template<typename R, typename... Args>
+    struct is_std_function<std::function<R(Args...)>> : std::true_type
+    {
+    };
+
+    // Helper variable template for convenience (C++14 onwards)
+    template<typename T>
+    constexpr bool is_std_function_v = is_std_function<T>::value;
+}
+
 namespace LLInitParam
 {
     // used to indicate no matching value to a given name when parsing
@@ -114,7 +135,7 @@ namespace LLInitParam
 
     // wraps comparison operator between any 2 values of the same type
     // specialize to handle cases where equality isn't defined well, or at all
-    template <typename T, bool IS_BOOST_FUNCTION = boost::is_convertible<T, boost::function_base>::value >
+    template <typename T, bool IS_BOOST_FUNCTION = std::is_constructible_v<T, boost::function_base> || ll::is_std_function_v<T>>
     struct ParamCompare
     {
         static bool equals(const T &a, const T &b)
@@ -123,7 +144,7 @@ namespace LLInitParam
         }
     };
 
-    // boost function types are not comparable
+    // boost and std function types are not comparable
     template<typename T>
     struct ParamCompare<T, true>
     {
@@ -474,7 +495,7 @@ namespace LLInitParam
 
         typedef bool (*parser_read_func_t)(Parser& parser, void* output);
         typedef bool (*parser_write_func_t)(Parser& parser, const void*, name_stack_t&);
-        typedef boost::function<void (name_stack_t&, S32, S32, const possible_values_t*)>   parser_inspect_func_t;
+        typedef std::function<void (name_stack_t&, S32, S32, const possible_values_t*)>   parser_inspect_func_t;
 
         typedef std::map<const std::type_info*, parser_read_func_t>     parser_read_func_map_t;
         typedef std::map<const std::type_info*, parser_write_func_t>    parser_write_func_map_t;
@@ -491,7 +512,7 @@ namespace LLInitParam
 
         virtual ~Parser();
 
-        template <typename T> bool readValue(T& param, typename boost::disable_if<boost::is_enum<T> >::type* dummy = 0)
+        template <typename T> bool readValue(T& param, typename std::enable_if_t<!std::is_enum_v<T>>* dummy = 0)
         {
             parser_read_func_map_t::iterator found_it = mParserReadFuncs->find(&typeid(T));
             if (found_it != mParserReadFuncs->end())
@@ -502,7 +523,7 @@ namespace LLInitParam
             return false;
         }
 
-        template <typename T> bool readValue(T& param, typename boost::enable_if<boost::is_enum<T> >::type* dummy = 0)
+        template <typename T> bool readValue(T& param, typename std::enable_if_t<std::is_enum_v<T> >* dummy = 0)
         {
             parser_read_func_map_t::iterator found_it = mParserReadFuncs->find(&typeid(T));
             if (found_it != mParserReadFuncs->end())
diff --git a/indra/llcommon/llleap.cpp b/indra/llcommon/llleap.cpp
index 662a2511cd..1614cc6e57 100644
--- a/indra/llcommon/llleap.cpp
+++ b/indra/llcommon/llleap.cpp
@@ -61,7 +61,7 @@ public:
         // Pass it a callback to our connect() method, so it can send events
         // from a particular LLEventPump to the plugin without having to know
         // this class or method name.
-        mListener(new LLLeapListener(
+        mListener(std::make_unique<LLLeapListener>(
                       [this](LLEventPump& pump, const std::string& listener)
                       { return connect(pump, listener); }))
     {
@@ -188,6 +188,17 @@ public:
                                << childout.peek(0, peeklen) << "..." << LL_ENDL;
         }
 
+        // Handle any remaining stderr data (partial lines) the same way as we do
+        // for stdout: log it.
+        LLProcess::ReadPipe& childerr(mChild->getReadPipe(LLProcess::STDERR));
+        if (childerr.size())
+        {
+            LLProcess::ReadPipe::size_type
+                peeklen((std::min)(LLProcess::ReadPipe::size_type(50), childerr.size()));
+            LL_WARNS("LLLeap") << "Final stderr " << childerr.size() << " bytes: "
+                               << childerr.peek(0, peeklen) << "..." << LL_ENDL;
+        }
+
         // Kill this instance. MUST BE LAST before return!
         delete this;
         return false;
diff --git a/indra/llcommon/llleaplistener.h b/indra/llcommon/llleaplistener.h
index cad4543d02..f5587d1d68 100644
--- a/indra/llcommon/llleaplistener.h
+++ b/indra/llcommon/llleaplistener.h
@@ -13,10 +13,9 @@
 #define LL_LLLEAPLISTENER_H
 
 #include "lleventapi.h"
+#include <functional>
 #include <map>
 #include <string>
-#include <boost/function.hpp>
-#include <boost/ptr_container/ptr_map.hpp>
 
 /// Listener class implementing LLLeap query/control operations.
 /// See https://jira.lindenlab.com/jira/browse/DEV-31978.
@@ -31,7 +30,7 @@ public:
      * define the signature for a function that will perform that, and make
      * our constructor accept such a function.
      */
-    typedef boost::function<LLBoundListener(LLEventPump&, const std::string& listener)>
+    typedef std::function<LLBoundListener(LLEventPump&, const std::string& listener)>
             ConnectFunc;
     LLLeapListener(const ConnectFunc& connect);
     ~LLLeapListener();
diff --git a/indra/llcommon/llmutex.h b/indra/llcommon/llmutex.h
index 62943845a5..f3615a1270 100644
--- a/indra/llcommon/llmutex.h
+++ b/indra/llcommon/llmutex.h
@@ -29,7 +29,6 @@
 
 #include "stdtypes.h"
 #include "llthread.h"
-#include <boost/noncopyable.hpp>
 
 #include "mutex.h"
 #include <shared_mutex>
@@ -249,7 +248,7 @@ private:
 * The constructor handles the lock, and the destructor handles
 * the unlock. Instances of this class are <b>not</b> thread safe.
 */
-class LL_COMMON_API LLScopedLock : private boost::noncopyable
+class LL_COMMON_API LLScopedLock
 {
 public:
     /**
@@ -265,6 +264,12 @@ public:
     */
     ~LLScopedLock();
 
+    /*
+    * @brief Non-copyable constructor and operator
+    */
+    LLScopedLock(const LLScopedLock&) = delete;
+    LLScopedLock& operator=(const LLScopedLock&) = delete;
+
     /**
     * @brief Check lock.
     */
diff --git a/indra/llcommon/llpounceable.h b/indra/llcommon/llpounceable.h
index 0421ce966a..e86098f20b 100644
--- a/indra/llcommon/llpounceable.h
+++ b/indra/llcommon/llpounceable.h
@@ -36,13 +36,13 @@
 #define LL_LLPOUNCEABLE_H
 
 #include "llsingleton.h"
-#include <boost/noncopyable.hpp>
 #include <boost/call_traits.hpp>
-#include <boost/type_traits/remove_pointer.hpp>
 #include <boost/utility/value_init.hpp>
 #include <boost/unordered_map.hpp>
 #include <boost/signals2/signal.hpp>
 
+#include <type_traits>
+
 // Forward declare the user template, since we want to be able to point to it
 // in some of its implementation classes.
 template <typename T, class TAG>
@@ -139,7 +139,7 @@ private:
 // LLPounceable<T> is for an LLPounceable instance on the heap or the stack.
 // LLPounceable<T, LLPounceableStatic> is for a static LLPounceable instance.
 template <typename T, class TAG=LLPounceableQueue>
-class LLPounceable: public boost::noncopyable
+class LLPounceable
 {
 private:
     typedef LLPounceableTraits<T, TAG> traits;
@@ -158,9 +158,13 @@ public:
         mEmpty(empty)
     {}
 
+    // Non-copyable
+    LLPounceable(const LLPounceable&) = delete;
+    LLPounceable& operator=(const LLPounceable&) = delete;
+
     // make read access to mHeld as cheap and transparent as possible
     operator T () const { return mHeld; }
-    typename boost::remove_pointer<T>::type operator*() const { return *mHeld; }
+    typename std::remove_pointer<T>::type operator*() const { return *mHeld; }
     typename boost::call_traits<T>::value_type operator->() const { return mHeld; }
     // uncomment 'explicit' as soon as we allow C++11 compilation
     /*explicit*/ operator bool() const { return bool(mHeld); }
diff --git a/indra/llcommon/llprocess.cpp b/indra/llcommon/llprocess.cpp
index 912e596c3f..670b740133 100644
--- a/indra/llcommon/llprocess.cpp
+++ b/indra/llcommon/llprocess.cpp
@@ -457,7 +457,8 @@ public:
                        ("slot", LLSD::Integer(mIndex))
                        ("name", whichfile(mIndex))
                        ("desc", mDesc)
-                       ("eof", state == CLOSED));
+                       ("eof", state == CLOSED)
+                       ("exhst", state == EXHAUSTED));
         }
 
         return false;
@@ -528,18 +529,9 @@ LLProcess::LLProcess(const LLSDOrParams& params):
     // preserve existing semantics, we promise that mAttached defaults to the
     // same setting as mAutokill.
     mAttached(params.attached.isProvided()? params.attached : params.autokill),
-    mPool(NULL),
-    mPipes(NSLOTS)
+    mPool(NULL)
 {
-    // Hmm, when you construct a ptr_vector with a size, it merely reserves
-    // space, it doesn't actually make it that big. Explicitly make it bigger.
-    // Because of ptr_vector's odd semantics, have to push_back(0) the right
-    // number of times! resize() wants to default-construct new BasePipe
-    // instances, which fails because it's pure virtual. But because of the
-    // constructor call, these push_back() calls should require no new
-    // allocation.
-    for (size_t i = 0; i < mPipes.capacity(); ++i)
-        mPipes.push_back(0);
+    mPipes.resize(NSLOTS);
 
     if (! params.validateBlock(true))
     {
@@ -751,11 +743,11 @@ LLProcess::LLProcess(const LLSDOrParams& params):
         apr_file_t* pipe(mProcess.*(members[i]));
         if (i == STDIN)
         {
-            mPipes.replace(i, new WritePipeImpl(desc, pipe));
+            mPipes[i] = std::make_unique<WritePipeImpl>(desc, pipe);
         }
         else
         {
-            mPipes.replace(i, new ReadPipeImpl(desc, pipe, FILESLOT(i)));
+            mPipes[i] = std::make_unique<ReadPipeImpl>(desc, pipe, FILESLOT(i));
         }
         // Removed temporaily for Xcode 7 build tests: error was:
         // "error: expression with side effects will be evaluated despite
@@ -1063,14 +1055,14 @@ PIPETYPE* LLProcess::getPipePtr(std::string& error, FILESLOT slot)
         error = STRINGIZE(mDesc << " has no slot " << slot);
         return NULL;
     }
-    if (mPipes.is_null(slot))
+    if (!mPipes[slot])
     {
         error = STRINGIZE(mDesc << ' ' << whichfile(slot) << " not a monitored pipe");
         return NULL;
     }
     // Make sure we dynamic_cast in pointer domain so we can test, rather than
     // accepting runtime's exception.
-    PIPETYPE* ppipe = dynamic_cast<PIPETYPE*>(&mPipes[slot]);
+    PIPETYPE* ppipe = dynamic_cast<PIPETYPE*>(mPipes[slot].get());
     if (! ppipe)
     {
         error = STRINGIZE(mDesc << ' ' << whichfile(slot) << " not a " << typeid(PIPETYPE).name());
diff --git a/indra/llcommon/llprocess.h b/indra/llcommon/llprocess.h
index cc2d6566fc..0c71cfc415 100644
--- a/indra/llcommon/llprocess.h
+++ b/indra/llcommon/llprocess.h
@@ -31,9 +31,7 @@
 #include "llsdparam.h"
 #include "llexception.h"
 #include "apr_thread_proc.h"
-#include <boost/ptr_container/ptr_vector.hpp>
 #include <boost/optional.hpp>
-#include <boost/noncopyable.hpp>
 #include <iosfwd>                   // std::ostream
 
 #if LL_WINDOWS
@@ -67,7 +65,7 @@ typedef std::shared_ptr<LLProcess> LLProcessPtr;
  * indra/llcommon/tests/llprocess_test.cpp for an example of waiting for
  * child-process termination in a standalone test context.
  */
-class LL_COMMON_API LLProcess: public boost::noncopyable
+class LL_COMMON_API LLProcess
 {
     LOG_CLASS(LLProcess);
 public:
@@ -542,6 +540,10 @@ public:
     static std::string basename(const std::string& path);
     static std::string getline(std::istream&);
 
+    // Non-copyable
+    LLProcess(const LLProcess&) = delete;
+    LLProcess& operator=(const LLProcess&) = delete;
+
 private:
     /// constructor is private: use create() instead
     LLProcess(const LLSDOrParams& params);
@@ -564,7 +566,7 @@ private:
     bool mAutokill, mAttached;
     Status mStatus;
     // explicitly want this ptr_vector to be able to store NULLs
-    typedef boost::ptr_vector< boost::nullable<BasePipe> > PipeVector;
+    typedef std::vector<std::unique_ptr<BasePipe>> PipeVector;
     PipeVector mPipes;
     apr_pool_t* mPool;
 };
diff --git a/indra/llcommon/llprocessor.cpp b/indra/llcommon/llprocessor.cpp
index 718f471321..0778b123ea 100644
--- a/indra/llcommon/llprocessor.cpp
+++ b/indra/llcommon/llprocessor.cpp
@@ -739,32 +739,7 @@ private:
             }
         }
 
-        // *NOTE:Mani - I didn't find any docs that assure me that machdep.cpu.feature_bits will always be
-        // The feature bits I think it is. Here's a test:
-#ifndef LL_RELEASE_FOR_DOWNLOAD
-    #if defined(__i386__) && defined(__PIC__)
-            /* %ebx may be the PIC register.  */
-        #define __cpuid(level, a, b, c, d)          \
-        __asm__ ("xchgl\t%%ebx, %1\n\t"         \
-                "cpuid\n\t"                 \
-                "xchgl\t%%ebx, %1\n\t"          \
-                : "=a" (a), "=r" (b), "=c" (c), "=d" (d)    \
-                : "0" (level))
-    #else
-        #define __cpuid(level, a, b, c, d)          \
-        __asm__ ("cpuid\n\t"                    \
-                 : "=a" (a), "=b" (b), "=c" (c), "=d" (d)   \
-                 : "0" (level))
-    #endif
-
-        unsigned int eax, ebx, ecx, edx;
-        __cpuid(0x1, eax, ebx, ecx, edx);
-        if(feature_infos[0] != (S32)edx)
-        {
-            LL_WARNS() << "machdep.cpu.feature_bits doesn't match expected cpuid result!" << LL_ENDL;
-        }
-#endif // LL_RELEASE_FOR_DOWNLOAD
-
+        // @TODO: Audit our usage of machdep.cpu.feature_bits.
 
         uint64_t ext_feature_info = getSysctlInt64("machdep.cpu.extfeature_bits");
         S32 *ext_feature_infos = (S32*)(&ext_feature_info);
diff --git a/indra/llcommon/llprocinfo.h b/indra/llcommon/llprocinfo.h
index 5955799812..0fc8b9dbe4 100644
--- a/indra/llcommon/llprocinfo.h
+++ b/indra/llcommon/llprocinfo.h
@@ -51,10 +51,10 @@ public:
     typedef U64 time_type;                              /// Relative microseconds
 
 private:
-    LLProcInfo();                                       // Not defined
-    ~LLProcInfo();                                      // Not defined
-    LLProcInfo(const LLProcInfo &);                     // Not defined
-    void operator=(const LLProcInfo &);                 // Not defined
+    LLProcInfo() = delete;
+    ~LLProcInfo() = delete;
+    LLProcInfo(const LLProcInfo&) = delete;
+    LLProcInfo& operator=(const LLProcInfo&) = delete;
 
 public:
     /// Get accumulated system and user CPU time in
diff --git a/indra/llcommon/llptrto.cpp b/indra/llcommon/llptrto.cpp
index c4528a47a7..adf636c4d2 100644
--- a/indra/llcommon/llptrto.cpp
+++ b/indra/llcommon/llptrto.cpp
@@ -31,10 +31,9 @@
 // associated header
 #include "llptrto.h"
 // STL headers
+#include <type_traits>
 // std headers
 // external library headers
-#include <boost/type_traits/is_same.hpp>
-#include <boost/static_assert.hpp>
 // other Linden headers
 #include "llmemory.h"
 
@@ -76,27 +75,27 @@ public:
 int main(int argc, char *argv[])
 {
     // test LLPtrTo<>
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<RCFoo>::type, LLPointer<RCFoo> >::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<RCSubFoo>::type, LLPointer<RCSubFoo> >::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<TSRCFoo>::type, LLPointer<TSRCFoo> >::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<Bar>::type, Bar*>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<SubBar>::type, SubBar*>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<int>::type, int*>::value));
+    static_assert((std::is_same_v<LLPtrTo<RCFoo>::type, LLPointer<RCFoo> >));
+    static_assert((std::is_same_v<LLPtrTo<RCSubFoo>::type, LLPointer<RCSubFoo> >));
+    static_assert((std::is_same_v<LLPtrTo<TSRCFoo>::type, LLPointer<TSRCFoo> >));
+    static_assert((std::is_same_v<LLPtrTo<Bar>::type, Bar*>));
+    static_assert((std::is_same_v<LLPtrTo<SubBar>::type, SubBar*>));
+    static_assert((std::is_same_v<LLPtrTo<int>::type, int*>));
 
     // Test LLRemovePointer<>. Note that we remove both pointer variants from
     // each kind of type, regardless of whether the variant makes sense.
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<RCFoo*>::type, RCFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<RCFoo> >::type, RCFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<RCSubFoo*>::type, RCSubFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<RCSubFoo> >::type, RCSubFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<TSRCFoo*>::type, TSRCFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<TSRCFoo> >::type, TSRCFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<Bar*>::type, Bar>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<Bar> >::type, Bar>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<SubBar*>::type, SubBar>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<SubBar> >::type, SubBar>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<int*>::type, int>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<int> >::type, int>::value));
+    static_assert((std::is_same_v<LLRemovePointer<RCFoo*>::type, RCFoo>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<RCFoo> >::type, RCFoo>));
+    static_assert((std::is_same_v<LLRemovePointer<RCSubFoo*>::type, RCSubFoo>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<RCSubFoo> >::type, RCSubFoo>));
+    static_assert((std::is_same_v<LLRemovePointer<TSRCFoo*>::type, TSRCFoo>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<TSRCFoo> >::type, TSRCFoo>));
+    static_assert((std::is_same_v<LLRemovePointer<Bar*>::type, Bar>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<Bar> >::type, Bar>));
+    static_assert((std::is_same_v<LLRemovePointer<SubBar*>::type, SubBar>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<SubBar> >::type, SubBar>));
+    static_assert((std::is_same_v<LLRemovePointer<int*>::type, int>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<int> >::type, int>));
 
     return 0;
 }
diff --git a/indra/llcommon/llptrto.h b/indra/llcommon/llptrto.h
index b57a1ee7f4..24e312559e 100644
--- a/indra/llcommon/llptrto.h
+++ b/indra/llcommon/llptrto.h
@@ -35,8 +35,6 @@
 #include "llrefcount.h"             // LLRefCount
 #include <boost/intrusive_ptr.hpp>
 #include <boost/shared_ptr.hpp>
-#include <boost/type_traits/is_base_of.hpp>
-#include <boost/type_traits/remove_pointer.hpp>
 #include <memory>                   // std::shared_ptr, std::unique_ptr
 #include <type_traits>
 
@@ -58,14 +56,14 @@ struct LLPtrTo
 
 /// specialize for subclasses of LLRefCount
 template <class T>
-struct LLPtrTo<T, typename std::enable_if< boost::is_base_of<LLRefCount, T>::value >::type>
+struct LLPtrTo<T, typename std::enable_if< std::is_base_of<LLRefCount, T>::value >::type>
 {
     typedef LLPointer<T> type;
 };
 
 /// specialize for subclasses of LLThreadSafeRefCount
 template <class T>
-struct LLPtrTo<T, typename std::enable_if< boost::is_base_of<LLThreadSafeRefCount, T>::value >::type>
+struct LLPtrTo<T, typename std::enable_if< std::is_base_of<LLThreadSafeRefCount, T>::value >::type>
 {
     typedef LLPointer<T> type;
 };
@@ -76,7 +74,7 @@ struct LLPtrTo<T, typename std::enable_if< boost::is_base_of<LLThreadSafeRefCoun
 template <typename PTRTYPE>
 struct LLRemovePointer
 {
-    typedef typename boost::remove_pointer<PTRTYPE>::type type;
+    typedef typename std::remove_pointer<PTRTYPE>::type type;
 };
 
 /// specialize for LLPointer<SOMECLASS>
diff --git a/indra/llcommon/llqueuedthread.cpp b/indra/llcommon/llqueuedthread.cpp
index 0196a24b18..efeeb1340e 100644
--- a/indra/llcommon/llqueuedthread.cpp
+++ b/indra/llcommon/llqueuedthread.cpp
@@ -80,7 +80,7 @@ void LLQueuedThread::shutdown()
             mRequestQueue.close();
         }
 
-        S32 timeout = 100;
+        S32 timeout = 50;
         for ( ; timeout>0; timeout--)
         {
             if (isStopped())
@@ -101,19 +101,34 @@ void LLQueuedThread::shutdown()
     }
 
     QueuedRequest* req;
-    S32 active_count = 0;
+    S32 queued_count = 0;
+    bool  has_active = false;
+    lockData();
     while ( (req = (QueuedRequest*)mRequestHash.pop_element()) )
     {
-        if (req->getStatus() == STATUS_QUEUED || req->getStatus() == STATUS_INPROGRESS)
+        if (req->getStatus() == STATUS_INPROGRESS)
+        {
+            has_active = true;
+            req->setFlags(FLAG_ABORT | FLAG_AUTO_COMPLETE);
+            continue;
+        }
+        if (req->getStatus() == STATUS_QUEUED)
         {
-            ++active_count;
+            ++queued_count;
             req->setStatus(STATUS_ABORTED); // avoid assert in deleteRequest
         }
         req->deleteRequest();
     }
-    if (active_count)
+    unlockData();
+    if (queued_count)
+    {
+        LL_WARNS() << "~LLQueuedThread() called with unpocessed requests: " << queued_count << LL_ENDL;
+    }
+    if (has_active)
     {
-        LL_WARNS() << "~LLQueuedThread() called with active requests: " << active_count << LL_ENDL;
+        LL_WARNS() << "~LLQueuedThread() called with active requests!" << LL_ENDL;
+        ms_sleep(100); // last chance for request to finish
+        printQueueStats();
     }
 
     mRequestQueue.close();
@@ -570,7 +585,12 @@ LLQueuedThread::QueuedRequest::QueuedRequest(LLQueuedThread::handle_t handle, U3
 
 LLQueuedThread::QueuedRequest::~QueuedRequest()
 {
-    llassert_always(mStatus == STATUS_DELETE);
+    if (mStatus != STATUS_DELETE)
+    {
+        // The only method to delete a request is deleteRequest(),
+        // it should have set the status to STATUS_DELETE
+        LL_ERRS() << "LLQueuedThread::QueuedRequest deleted with status " << mStatus << LL_ENDL;
+    }
 }
 
 //virtual
diff --git a/indra/llcommon/llqueuedthread.h b/indra/llcommon/llqueuedthread.h
index 02d3a96fcc..de50b8ae95 100644
--- a/indra/llcommon/llqueuedthread.h
+++ b/indra/llcommon/llqueuedthread.h
@@ -117,11 +117,11 @@ public:
     virtual ~LLQueuedThread();
     virtual void shutdown();
 
-private:
     // No copy constructor or copy assignment
-    LLQueuedThread(const LLQueuedThread&);
-    LLQueuedThread& operator=(const LLQueuedThread&);
+    LLQueuedThread(const LLQueuedThread&) = delete;
+    LLQueuedThread& operator=(const LLQueuedThread&) = delete;
 
+private:
     virtual bool runCondition(void);
     virtual void run(void);
     virtual void startThread(void);
diff --git a/indra/llcommon/llrefcount.h b/indra/llcommon/llrefcount.h
index 3a253d8fa6..93ca7d1d00 100644
--- a/indra/llcommon/llrefcount.h
+++ b/indra/llcommon/llrefcount.h
@@ -26,7 +26,6 @@
 #ifndef LLREFCOUNT_H
 #define LLREFCOUNT_H
 
-#include <boost/noncopyable.hpp>
 #include <boost/intrusive_ptr.hpp>
 #include "llatomic.h"
 
diff --git a/indra/llcommon/llsdparam.cpp b/indra/llcommon/llsdparam.cpp
index 3ae153a67c..caaac3d762 100644
--- a/indra/llcommon/llsdparam.cpp
+++ b/indra/llcommon/llsdparam.cpp
@@ -30,7 +30,6 @@
 // Project includes
 #include "llsdparam.h"
 #include "llsdutil.h"
-#include "boost/bind.hpp"
 
 static  LLInitParam::Parser::parser_read_func_map_t sReadFuncs;
 static  LLInitParam::Parser::parser_write_func_map_t sWriteFuncs;
@@ -43,8 +42,6 @@ static const LLSD NO_VALUE_MARKER;
 LLParamSDParser::LLParamSDParser()
 : Parser(sReadFuncs, sWriteFuncs, sInspectFuncs)
 {
-    using boost::bind;
-
     if (sReadFuncs.empty())
     {
         registerParserFuncs<LLInitParam::Flag>(readFlag, &LLParamSDParser::writeFlag);
@@ -97,7 +94,7 @@ void LLParamSDParser::readSD(const LLSD& sd, LLInitParam::BaseBlock& block, bool
     mNameStack.clear();
     setParseSilently(silent);
 
-    LLParamSDParserUtilities::readSDValues(boost::bind(&LLParamSDParser::submit, this, boost::ref(block), _1, _2), sd, mNameStack);
+    LLParamSDParserUtilities::readSDValues(std::bind(&LLParamSDParser::submit, this, std::ref(block), std::placeholders::_1, std::placeholders::_2), sd, mNameStack);
     //readSDValues(sd, block);
 }
 
@@ -276,14 +273,14 @@ void LLParamSDParserUtilities::readSDValues(read_sd_cb_t cb, const LLSD& sd, LLI
     }
     else if (sd.isUndefined())
     {
-        if (!cb.empty())
+        if (cb != nullptr)
         {
             cb(NO_VALUE_MARKER, stack);
         }
     }
     else
     {
-        if (!cb.empty())
+        if (cb != nullptr)
         {
             cb(sd, stack);
         }
@@ -333,7 +330,7 @@ namespace LLInitParam
         if (!p.writeValue<LLSD>(mValue, name_stack_range))
         {
             // otherwise read from LLSD value and serialize out to parser (which could be LLSD, XUI, etc)
-            LLParamSDParserUtilities::readSDValues(boost::bind(&serializeElement, boost::ref(p), _1, _2), mValue, name_stack_range);
+            LLParamSDParserUtilities::readSDValues(std::bind(&serializeElement, std::ref(p), std::placeholders::_1, std::placeholders::_2), mValue, name_stack_range);
         }
         return true;
     }
diff --git a/indra/llcommon/llsdparam.h b/indra/llcommon/llsdparam.h
index 21ebb9a258..447ba02327 100644
--- a/indra/llcommon/llsdparam.h
+++ b/indra/llcommon/llsdparam.h
@@ -29,14 +29,14 @@
 #define LL_LLSDPARAM_H
 
 #include "llinitparam.h"
-#include "boost/function.hpp"
+#include <functional>
 #include "llfasttimer.h"
 
 struct LL_COMMON_API LLParamSDParserUtilities
 {
     static LLSD& getSDWriteNode(LLSD& input, LLInitParam::Parser::name_stack_range_t& name_stack_range);
 
-    typedef boost::function<void (const LLSD&, LLInitParam::Parser::name_stack_t&)> read_sd_cb_t;
+    typedef std::function<void (const LLSD&, LLInitParam::Parser::name_stack_t&)> read_sd_cb_t;
     static void readSDValues(read_sd_cb_t cb, const LLSD& sd, LLInitParam::Parser::name_stack_t& stack);
     static void readSDValues(read_sd_cb_t cb, const LLSD& sd);
 };
diff --git a/indra/llcommon/llsingleton.h b/indra/llcommon/llsingleton.h
index b5659e053c..3fba8602ee 100644
--- a/indra/llcommon/llsingleton.h
+++ b/indra/llcommon/llsingleton.h
@@ -25,7 +25,6 @@
 #ifndef LLSINGLETON_H
 #define LLSINGLETON_H
 
-#include <boost/noncopyable.hpp>
 #include <boost/unordered_set.hpp>
 #include <initializer_list>
 #include <list>
@@ -43,11 +42,14 @@
 #pragma warning(disable : 4506)   // no definition for inline function
 #endif
 
-class LLSingletonBase: private boost::noncopyable
+class LLSingletonBase
 {
 public:
     class MasterList;
 
+    LLSingletonBase(const LLSingletonBase&) = delete;
+    LLSingletonBase& operator=(const LLSingletonBase&) = delete;
+
 private:
     // All existing LLSingleton instances are tracked in this master list.
     typedef std::list<LLSingletonBase*> list_t;
diff --git a/indra/llcommon/llstring.h b/indra/llcommon/llstring.h
index db716b1431..7dd8256e72 100644
--- a/indra/llcommon/llstring.h
+++ b/indra/llcommon/llstring.h
@@ -1234,9 +1234,9 @@ void LLStringUtilBase<T>::getTokens(const string_type& string, std::vector<strin
     // (unless there ARE no escapes).
     std::unique_ptr< LLStringUtilBaseImpl::InString<T> > instrp;
     if (escapes.empty())
-        instrp.reset(new LLStringUtilBaseImpl::InString<T>(string.begin(), string.end()));
+        instrp = std::make_unique<LLStringUtilBaseImpl::InString<T>>(string.begin(), string.end());
     else
-        instrp.reset(new LLStringUtilBaseImpl::InEscString<T>(string.begin(), string.end(), escapes));
+        instrp = std::make_unique<LLStringUtilBaseImpl::InEscString<T>>(string.begin(), string.end(), escapes);
     LLStringUtilBaseImpl::getTokens(*instrp, tokens, drop_delims, keep_delims, quotes);
 }
 
diff --git a/indra/llcommon/llsys.cpp b/indra/llcommon/llsys.cpp
index 21b11c5311..803bab393c 100644
--- a/indra/llcommon/llsys.cpp
+++ b/indra/llcommon/llsys.cpp
@@ -51,9 +51,6 @@
 #include <boost/circular_buffer.hpp>
 #include <boost/lexical_cast.hpp>
 #include <boost/range.hpp>
-#include <boost/utility/enable_if.hpp>
-#include <boost/type_traits/is_integral.hpp>
-#include <boost/type_traits/is_float.hpp>
 #include "llfasttimer.h"
 
 using namespace llsd;
@@ -722,7 +719,7 @@ public:
     // Store every integer type as LLSD::Integer.
     template <class T>
     void add(const LLSD::String& name, const T& value,
-             typename boost::enable_if<boost::is_integral<T> >::type* = 0)
+             typename std::enable_if_t<std::is_integral_v<T> >* = 0)
     {
         mStats[name] = LLSD::Integer(value);
     }
@@ -730,7 +727,7 @@ public:
     // Store every floating-point type as LLSD::Real.
     template <class T>
     void add(const LLSD::String& name, const T& value,
-             typename boost::enable_if<boost::is_float<T> >::type* = 0)
+             typename std::enable_if_t<std::is_floating_point_v<T> >* = 0)
     {
         mStats[name] = LLSD::Real(value);
     }
@@ -1348,10 +1345,6 @@ bool gunzip_file(const std::string& srcfile, const std::string& dstfile)
     } while(gzeof(src) == 0);
     fclose(dst);
     dst = NULL;
-#if LL_WINDOWS
-    // Rename in windows needs the dstfile to not exist.
-    LLFile::remove(dstfile, ENOENT);
-#endif
     if (LLFile::rename(tmpfile, dstfile) == -1) goto err;       /* Flawfinder: ignore */
     retval = true;
 err:
@@ -1399,10 +1392,6 @@ bool gzip_file(const std::string& srcfile, const std::string& dstfile)
 
     gzclose(dst);
     dst = NULL;
-#if LL_WINDOWS
-    // Rename in windows needs the dstfile to not exist.
-    LLFile::remove(dstfile);
-#endif
     if (LLFile::rename(tmpfile, dstfile) == -1) goto err;       /* Flawfinder: ignore */
     retval = true;
  err:
diff --git a/indra/llcommon/lltreeiterators.h b/indra/llcommon/lltreeiterators.h
index cef501b987..cc13955d2f 100644
--- a/indra/llcommon/lltreeiterators.h
+++ b/indra/llcommon/lltreeiterators.h
@@ -60,10 +60,10 @@
 #define LL_LLTREEITERATORS_H
 
 #include "llptrto.h"
+#include <functional>
 #include <vector>
 #include <deque>
 #include <boost/iterator/iterator_facade.hpp>
-#include <boost/function.hpp>
 #include <boost/static_assert.hpp>
 
 namespace LLTreeIter
@@ -93,7 +93,7 @@ protected:
     typedef typename LLPtrTo<NODE>::type ptr_type;
     /// function that advances from this node to next accepts a node pointer
     /// and returns another
-    typedef boost::function<ptr_type(const ptr_type&)> func_type;
+    typedef std::function<ptr_type(const ptr_type&)> func_type;
     typedef SELFTYPE self_type;
 };
 
@@ -330,7 +330,7 @@ protected:
     typedef typename super::ptr_type ptr_type;
     // The func_type is different for this: from a NODE pointer, we must
     // obtain a CHILDITER.
-    typedef boost::function<CHILDITER(const ptr_type&)> func_type;
+    typedef std::function<CHILDITER(const ptr_type&)> func_type;
 private:
     typedef std::vector<ptr_type> list_type;
 public:
@@ -435,7 +435,7 @@ protected:
     typedef typename super::ptr_type ptr_type;
     // The func_type is different for this: from a NODE pointer, we must
     // obtain a CHILDITER.
-    typedef boost::function<CHILDITER(const ptr_type&)> func_type;
+    typedef std::function<CHILDITER(const ptr_type&)> func_type;
 private:
     // Upon reaching a given node in our pending list, we need to know whether
     // we've already pushed that node's children, so we must associate a bool
@@ -574,7 +574,7 @@ protected:
     typedef typename super::ptr_type ptr_type;
     // The func_type is different for this: from a NODE pointer, we must
     // obtain a CHILDITER.
-    typedef boost::function<CHILDITER(const ptr_type&)> func_type;
+    typedef std::function<CHILDITER(const ptr_type&)> func_type;
 private:
     // We need a FIFO queue rather than a LIFO stack. Use a deque rather than
     // a vector, since vector can't implement pop_front() efficiently.
diff --git a/indra/llcommon/lluriparser.cpp b/indra/llcommon/lluriparser.cpp
index 33a48d970d..1d246bb70e 100644
--- a/indra/llcommon/lluriparser.cpp
+++ b/indra/llcommon/lluriparser.cpp
@@ -33,7 +33,7 @@ LLUriParser::LLUriParser(const std::string& u) : mTmpScheme(false), mNormalizedT
 {
     if (u.find("://") == std::string::npos)
     {
-        mNormalizedUri = "http://";
+        mNormalizedUri = "https://";
         mTmpScheme = true;
     }
 
diff --git a/indra/llcommon/tests/lldependencies_test.cpp b/indra/llcommon/tests/lldependencies_test.cpp
index 84eb41b5fe..2fea92e3b7 100644
--- a/indra/llcommon/tests/lldependencies_test.cpp
+++ b/indra/llcommon/tests/lldependencies_test.cpp
@@ -31,7 +31,6 @@
 #include <string>
 // std headers
 // external library headers
-#include <boost/assign/list_of.hpp>
 // Precompiled header
 #include "linden_common.h"
 // associated header
@@ -106,8 +105,6 @@ std::ostream& operator<<(std::ostream& out, const std::set<ENTRY>& set)
 /*****************************************************************************
 *   Other helpers
 *****************************************************************************/
-using boost::assign::list_of;
-
 typedef LLDependencies<> StringDeps;
 typedef StringDeps::KeyList StringList;
 
@@ -165,7 +162,7 @@ namespace tut
         // The quick brown fox jumps over the lazy yellow dog.
         // (note, "The" and "the" are distinct, else this test wouldn't work)
         deps.add("lazy");
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")));
+        ensure_equals(sorted_keys(deps), StringList{"lazy"});
         deps.add("jumps");
         ensure("found lazy", deps.get("lazy"));
         ensure("not found dog.", ! deps.get("dog."));
@@ -175,24 +172,23 @@ namespace tut
         // A change to the implementation of boost::topological_sort() would
         // be an acceptable reason, and you can simply update the expected
         // test output.
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")("jumps")));
-        deps.add("The", 0, empty, list_of("fox")("dog."));
+        ensure_equals(sorted_keys(deps), StringList{ "lazy", "jumps" });
+        deps.add("The", 0, empty, { "fox", "dog." });
         // Test key accessors
         ensure("empty before deps for missing key", is_empty(deps.get_before_range("bogus")));
         ensure("empty before deps for jumps", is_empty(deps.get_before_range("jumps")));
-        ensure_equals(instance_from_range< std::set<std::string> >(deps.get_before_range("The")),
-                      make< std::set<std::string> >(list_of("dog.")("fox")));
+        ensure_equals(instance_from_range< std::set<std::string> >(deps.get_before_range("The")), std::set<std::string>{ "dog.", "fox" });
         // resume building dependencies
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")("jumps")("The")));
-        deps.add("the", 0, list_of("The"));
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")("jumps")("The")("the")));
-        deps.add("fox", 0, list_of("The"), list_of("jumps"));
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")("The")("the")("fox")("jumps")));
-        deps.add("the", 0, list_of("The")); // same, see if cache works
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")("The")("the")("fox")("jumps")));
-        deps.add("jumps", 0, empty, list_of("over")); // update jumps deps
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")("The")("the")("fox")("jumps")));
-/*==========================================================================*|
+        ensure_equals(sorted_keys(deps), StringList{ "lazy", "jumps", "The" });
+        deps.add("the", 0, { "The" });
+        ensure_equals(sorted_keys(deps), StringList{ "lazy", "jumps", "The", "the" });
+        deps.add("fox", 0, { "The" }, { "jumps" });
+        ensure_equals(sorted_keys(deps), StringList{ "lazy", "The", "the", "fox", "jumps" });
+        deps.add("the", 0, { "The" }); // same, see if cache works
+        ensure_equals(sorted_keys(deps), StringList{ "lazy", "The", "the", "fox", "jumps" });
+        deps.add("jumps", 0, empty, { "over" }); // update jumps deps
+        ensure_equals(sorted_keys(deps), StringList{ "lazy", "The", "the", "fox", "jumps" });
+        /*==========================================================================*|
         // It drives me nuts that this test doesn't work in the test
         // framework, because -- for reasons unknown -- running the test
         // framework on Mac OS X 10.5 Leopard and Windows XP Pro, the catch
@@ -216,22 +212,21 @@ namespace tut
             deps.remove("over");
         }
 |*==========================================================================*/
-        deps.add("dog.", 0, list_of("yellow")("lazy"));
-        ensure_equals(instance_from_range< std::set<std::string> >(deps.get_after_range("dog.")),
-                      make< std::set<std::string> >(list_of("lazy")("yellow")));
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")("The")("the")("fox")("jumps")("dog.")));
-        deps.add("quick", 0, list_of("The"), list_of("fox")("brown"));
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")("The")("the")("quick")("fox")("jumps")("dog.")));
-        deps.add("over", 0, list_of("jumps"), list_of("yellow")("the"));
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("lazy")("The")("quick")("fox")("jumps")("over")("the")("dog.")));
-        deps.add("yellow", 0, list_of("the"), list_of("lazy"));
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("The")("quick")("fox")("jumps")("over")("the")("yellow")("lazy")("dog.")));
+        deps.add("dog.", 0, { "yellow", "lazy" });
+        ensure_equals(instance_from_range< std::set<std::string> >(deps.get_after_range("dog.")), std::set<std::string>{ "lazy", "yellow" });
+        ensure_equals(sorted_keys(deps), StringList{ "lazy", "The", "the", "fox", "jumps", "dog." });
+        deps.add("quick", 0, { "The" }, { "fox", "brown" });
+        ensure_equals(sorted_keys(deps), StringList{ "lazy", "The", "the", "quick", "fox", "jumps", "dog." });
+        deps.add("over", 0, { "jumps" }, { "yellow", "the" });
+        ensure_equals(sorted_keys(deps), StringList{ "lazy", "The", "quick", "fox", "jumps", "over", "the", "dog." });
+        deps.add("yellow", 0, { "the" }, { "lazy" });
+        ensure_equals(sorted_keys(deps), StringList{ "The", "quick", "fox", "jumps", "over", "the", "yellow", "lazy", "dog." });
         deps.add("brown");
         // By now the dependencies are pretty well in place. A change to THIS
         // order should be viewed with suspicion.
-        ensure_equals(sorted_keys(deps), make<StringList>(list_of("The")("quick")("brown")("fox")("jumps")("over")("the")("yellow")("lazy")("dog.")));
+        ensure_equals(sorted_keys(deps), StringList{ "The", "quick", "brown", "fox", "jumps", "over", "the", "yellow", "lazy", "dog." });
 
-        StringList keys(make<StringList>(list_of("The")("brown")("dog.")("fox")("jumps")("lazy")("over")("quick")("the")("yellow")));
+        StringList keys(StringList{ "The", "brown", "dog.", "fox", "jumps", "lazy", "over", "quick", "the", "yellow" });
         ensure_equals(instance_from_range<StringList>(deps.get_key_range()), keys);
 #if (! defined(__GNUC__)) || (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ > 3)
         // This is the succinct way, works on modern compilers
@@ -255,9 +250,9 @@ namespace tut
         typedef LLDependencies<std::string, int> NameIndexDeps;
         NameIndexDeps nideps;
         const NameIndexDeps& const_nideps(nideps);
-        nideps.add("def", 2, list_of("ghi"));
+        nideps.add("def", 2, { "ghi" });
         nideps.add("ghi", 3);
-        nideps.add("abc", 1, list_of("def"));
+        nideps.add("abc", 1, { "def" });
         NameIndexDeps::range range(nideps.get_range());
         ensure_equals(range.begin()->first, "abc");
         ensure_equals(range.begin()->second, 1);
@@ -269,20 +264,20 @@ namespace tut
         ensure_equals(const_iterator->first, "def");
         ensure_equals(const_iterator->second, 2);
 //        NameIndexDeps::node_range node_range(nideps.get_node_range());
-//        ensure_equals(instance_from_range<std::vector<int> >(node_range), make< std::vector<int> >(list_of(1)(2)(3)));
+//        ensure_equals(instance_from_range<std::vector<int> >(node_range), make< std::vector<int> >(list_of(1,2,3)));
 //        *node_range.begin() = 0;
 //        *node_range.begin() = 1;
         NameIndexDeps::const_node_range const_node_range(const_nideps.get_node_range());
-        ensure_equals(instance_from_range<std::vector<int> >(const_node_range), make< std::vector<int> >(list_of(1)(2)(3)));
+        ensure_equals(instance_from_range<std::vector<int>>(const_node_range), std::vector<int>{ 1, 2, 3 });
         NameIndexDeps::const_key_range const_key_range(const_nideps.get_key_range());
-        ensure_equals(instance_from_range<StringList>(const_key_range), make<StringList>(list_of("abc")("def")("ghi")));
+        ensure_equals(instance_from_range<StringList>(const_key_range), StringList{ "abc", "def", "ghi" });
         NameIndexDeps::sorted_range sorted(const_nideps.sort());
         NameIndexDeps::sorted_iterator sortiter(sorted.begin());
         ensure_equals(sortiter->first, "ghi");
         ensure_equals(sortiter->second, 3);
 
         // test all iterator-flavored versions of get_after_range()
-        StringList def(make<StringList>(list_of("def")));
+        StringList def{"def"};
         ensure("empty abc before list", is_empty(nideps.get_before_range(nideps.get_range().begin())));
         ensure_equals(instance_from_range<StringList>(nideps.get_after_range(nideps.get_range().begin())),
                       def);
@@ -296,7 +291,6 @@ namespace tut
                       def);
         // advance from "ghi" to "def", which must come after "ghi"
         ++sortiter;
-        ensure_equals(instance_from_range<StringList>(const_nideps.get_after_range(sortiter)),
-                      make<StringList>(list_of("ghi")));
+        ensure_equals(instance_from_range<StringList>(const_nideps.get_after_range(sortiter)), StringList{ "ghi" });
     }
 } // namespace tut
diff --git a/indra/llcommon/tests/lleventdispatcher_test.cpp b/indra/llcommon/tests/lleventdispatcher_test.cpp
index 44f772e322..8b206f7b14 100644
--- a/indra/llcommon/tests/lleventdispatcher_test.cpp
+++ b/indra/llcommon/tests/lleventdispatcher_test.cpp
@@ -33,7 +33,6 @@
 #include <stdexcept>
 
 #include <boost/bind.hpp>
-#include <boost/function.hpp>
 #include <boost/range.hpp>
 
 #include <boost/lambda/lambda.hpp>
diff --git a/indra/llcommon/tests/llprocess_test.cpp b/indra/llcommon/tests/llprocess_test.cpp
index b63cc52bec..d3d8e54d45 100644
--- a/indra/llcommon/tests/llprocess_test.cpp
+++ b/indra/llcommon/tests/llprocess_test.cpp
@@ -21,7 +21,6 @@
 // external library headers
 #include "llapr.h"
 #include "apr_thread_proc.h"
-#include <boost/function.hpp>
 #include <boost/algorithm/string/find_iterator.hpp>
 #include <boost/algorithm/string/finder.hpp>
 // other Linden headers
@@ -54,14 +53,29 @@ std::string apr_strerror_helper(apr_status_t rv)
 *****************************************************************************/
 
 #define ensure_equals_(left, right) \
-        ensure_equals(STRINGIZE(#left << " != " << #right), (left), (right))
+do { \
+    auto _left_val = (left); \
+    auto _right_val = (right); \
+    if (_left_val != _right_val) { \
+        std::string _msg = std::string(#left) + " != " + std::string(#right); \
+        tut::ensure_equals(_msg, _left_val, _right_val); \
+    } else { \
+        tut::ensure_equals("", _left_val, _right_val); \
+    } \
+} while(0)
 
 #define aprchk(expr) aprchk_(#expr, (expr))
 static void aprchk_(const char* call, apr_status_t rv, apr_status_t expected=APR_SUCCESS)
 {
-    tut::ensure_equals(STRINGIZE(call << " => " << rv << ": " << apr_strerror_helper
-                                 (rv)),
-                       rv, expected);
+    if (rv != expected)
+    {
+        std::string msg = std::string(call) + " => " + std::to_string(rv) + ": " + apr_strerror_helper(rv);
+        tut::ensure_equals(msg, rv, expected);
+    }
+    else
+    {
+        tut::ensure_equals("", rv, expected);
+    }
 }
 
 /**
@@ -78,11 +92,14 @@ static std::string readfile(const std::string& pathname, const std::string& desc
     std::string use_desc(desc);
     if (use_desc.empty())
     {
-        use_desc = STRINGIZE("in " << pathname);
+        use_desc = "in " + pathname;
     }
     std::ifstream inf(pathname.c_str());
     std::string output;
-    tut::ensure(STRINGIZE("No output " << use_desc), bool(std::getline(inf, output)));
+    if (!std::getline(inf, output))
+    {
+        tut::ensure("No output " + use_desc, false);
+    }
     std::string more;
     while (std::getline(inf, more))
     {
@@ -108,8 +125,10 @@ void waitfor(LLProcess& proc, int timeout=60)
     {
         yield();
     }
-    tut::ensure(STRINGIZE("process took longer than " << timeout << " seconds to terminate"),
-                i < timeout);
+    // Pump once more after the process exits to flush any final events such as EOF.
+    yield(0);
+    std::string msg = "process took longer than " + std::to_string(timeout) + " seconds to terminate";
+    tut::ensure(msg, i < timeout);
 }
 
 void waitfor(LLProcess::handle h, const std::string& desc, int timeout=60)
@@ -119,8 +138,10 @@ void waitfor(LLProcess::handle h, const std::string& desc, int timeout=60)
     {
         yield();
     }
-    tut::ensure(STRINGIZE("process took longer than " << timeout << " seconds to terminate"),
-                i < timeout);
+    // Pump once more after the process exits to flush any final events such as EOF.
+    yield(0);
+    std::string msg = "process took longer than " + std::to_string(timeout) + " seconds to terminate";
+    tut::ensure(msg, i < timeout);
 }
 
 /**
@@ -153,7 +174,8 @@ struct PythonProcessLauncher
         try
         {
             mPy = LLProcess::create(mParams);
-            tut::ensure(STRINGIZE("Couldn't launch " << mDesc << " script"), bool(mPy));
+            std::string msg = "Couldn't launch " + mDesc + " script";
+            tut::ensure(msg, bool(mPy));
         }
         catch (const tut::failure&)
         {
@@ -214,7 +236,8 @@ struct PythonProcessLauncher
         mParams.args.add(out.getName());
         run();
         // assuming the script wrote to that file, read it
-        return readfile(out.getName(), STRINGIZE("from " << mDesc << " script"));
+        std::string desc = "from " + mDesc + " script";
+        return readfile(out.getName(), desc);
     }
 
     LLProcess::Params mParams;
@@ -240,9 +263,12 @@ static std::string python_out(const std::string& desc, const CONTENT& script)
 }
 
 /// Create a temporary directory and clean it up later.
-class NamedTempDir: public boost::noncopyable
+class NamedTempDir
 {
 public:
+    NamedTempDir(const NamedTempDir&) = delete;
+    NamedTempDir& operator=(const NamedTempDir&) = delete;
+
     NamedTempDir():
         mPath(NamedTempFile::temp_path()),
         mCreated(boost::filesystem::create_directories(mPath))
@@ -1071,8 +1097,11 @@ namespace tut
         ensure_equals("bad child exit code",   py.mPy->getStatus().mData,  0);
     }
 
-    struct EventListener: public boost::noncopyable
+    struct EventListener
     {
+        EventListener(const EventListener&) = delete;
+        EventListener& operator=(const EventListener&) = delete;
+
         EventListener(LLEventPump& pump)
         {
             mConnection =
@@ -1183,8 +1212,8 @@ namespace tut
     {
         set_test_name("ReadPipe \"eof\" event");
         PythonProcessLauncher py(get_test_name(),
-            "from __future__ import print_function\n"
-            "print('Hello from Python!')\n");
+            "import time\n"
+            "time.sleep(1.5)\n");
         py.mParams.files.add(LLProcess::FileParam()); // stdin
         py.mParams.files.add(LLProcess::FileParam("pipe")); // stdout
         py.launch();
diff --git a/indra/llcommon/tests/llstring_test.cpp b/indra/llcommon/tests/llstring_test.cpp
index b18712b8e9..7393e0087c 100644
--- a/indra/llcommon/tests/llstring_test.cpp
+++ b/indra/llcommon/tests/llstring_test.cpp
@@ -28,13 +28,10 @@
 
 #include "linden_common.h"
 
-#include <boost/assign/list_of.hpp>
 #include "../llstring.h"
 #include "StringVec.h"                  // must come BEFORE lltut.h
 #include "../test/lltut.h"
 
-using boost::assign::list_of;
-
 namespace tut
 {
     struct string_index
@@ -763,14 +760,14 @@ namespace tut
         ensure_equals("only delims",
                       LLStringUtil::getTokens("   \r\n   ", " \r\n"), StringVec());
         ensure_equals("sequence of delims",
-                      LLStringUtil::getTokens(",,, one ,,,", ","), list_of("one"));
+                      LLStringUtil::getTokens(",,, one ,,,", ","), StringVec{"one"});
         // nat considers this a dubious implementation side effect, but I'd
         // hate to change it now...
         ensure_equals("noncontiguous tokens",
-                      LLStringUtil::getTokens(", ,, , one ,,,", ","), list_of("")("")("one"));
+                      LLStringUtil::getTokens(", ,, , one ,,,", ","), StringVec{ "", "", "one" });
         ensure_equals("space-padded tokens",
-                      LLStringUtil::getTokens(",    one  ,  two  ,", ","), list_of("one")("two"));
-        ensure_equals("no delims", LLStringUtil::getTokens("one", ","), list_of("one"));
+                      LLStringUtil::getTokens(",    one  ,  two  ,", ","), StringVec{"one", "two"});
+        ensure_equals("no delims", LLStringUtil::getTokens("one", ","), StringVec{ "one" });
     }
 
     // Shorthand for verifying that getTokens() behaves the same when you
@@ -817,39 +814,33 @@ namespace tut
         ensure_getTokens("only delims",
                          "   \r\n   ", " \r\n", "", StringVec());
         ensure_getTokens("sequence of delims",
-                         ",,, one ,,,", ", ", "", list_of("one"));
+                         ",,, one ,,,", ", ", "", StringVec{"one"});
         // Note contrast with the case in the previous method
         ensure_getTokens("noncontiguous tokens",
-                         ", ,, , one ,,,", ", ", "", list_of("one"));
+                         ", ,, , one ,,,", ", ", "", StringVec{"one"});
         ensure_getTokens("space-padded tokens",
                          ",    one  ,  two  ,", ", ", "",
-                         list_of("one")("two"));
-        ensure_getTokens("no delims", "one", ",", "", list_of("one"));
+                         StringVec{"one", "two"});
+        ensure_getTokens("no delims", "one", ",", "", StringVec{ "one" });
 
         // drop_delims vs. keep_delims
         ensure_getTokens("arithmetic",
-                         " ab+def  / xx*  yy ", " ", "+-*/",
-                         list_of("ab")("+")("def")("/")("xx")("*")("yy"));
+                         " ab+def  / xx*  yy ", " ", "+-*/", { "ab", "+", "def", "/", "xx", "*", "yy" });
 
         // quotes
         ensure_getTokens("no quotes",
-                         "She said, \"Don't go.\"", " ", ",", "",
-                         list_of("She")("said")(",")("\"Don't")("go.\""));
+                         "She said, \"Don't go.\"", " ", ",", "", { "She", "said", ",", "\"Don't", "go.\"" });
         ensure_getTokens("quotes",
-                         "She said, \"Don't go.\"", " ", ",", "\"",
-                         list_of("She")("said")(",")("Don't go."));
+                         "She said, \"Don't go.\"", " ", ",", "\"", { "She", "said", ",", "Don't go." });
         ensure_getTokens("quotes and delims",
                          "run c:/'Documents and Settings'/someone", " ", "", "'",
-                         list_of("run")("c:/Documents and Settings/someone"));
+                         { "run", "c:/Documents and Settings/someone" });
         ensure_getTokens("unmatched quote",
-                         "baby don't leave", " ", "", "'",
-                         list_of("baby")("don't")("leave"));
+                         "baby don't leave", " ", "", "'", { "baby", "don't", "leave" });
         ensure_getTokens("adjacent quoted",
-                         "abc'def \"ghi'\"jkl' mno\"pqr", " ", "", "\"'",
-                         list_of("abcdef \"ghijkl' mnopqr"));
+                         "abc'def \"ghi'\"jkl' mno\"pqr", " ", "", "\"'", { "abcdef \"ghijkl' mnopqr" });
         ensure_getTokens("quoted empty string",
-                         "--set SomeVar ''", " ", "", "'",
-                         list_of("--set")("SomeVar")(""));
+                         "--set SomeVar ''", " ", "", "'", { "--set", "SomeVar", "" });
 
         // escapes
         // Don't use backslash as an escape for these tests -- you'll go nuts
@@ -857,15 +848,12 @@ namespace tut
         // something else!
         ensure_equals("escaped delims",
                       LLStringUtil::getTokens("^ a - dog^-gone^ phrase", " ", "-", "", "^"),
-                      list_of(" a")("-")("dog-gone phrase"));
+                      StringVec{ " a", "-", "dog-gone phrase" });
         ensure_equals("escaped quotes",
                       LLStringUtil::getTokens("say: 'this isn^'t w^orking'.", " ", "", "'", "^"),
-                      list_of("say:")("this isn't working."));
+                      StringVec{ "say:", "this isn't working." });
         ensure_equals("escaped escape",
-                      LLStringUtil::getTokens("want x^^2", " ", "", "", "^"),
-                      list_of("want")("x^2"));
-        ensure_equals("escape at end",
-                      LLStringUtil::getTokens("it's^ up there^", " ", "", "'", "^"),
-                      list_of("it's up")("there^"));
+                      LLStringUtil::getTokens("want x^^2", " ", "", "", "^"), StringVec{ "want", "x^2" });
+        ensure_equals("escape at end", LLStringUtil::getTokens("it's^ up there^", " ", "", "'", "^"), StringVec{ "it's up", "there^" });
     }
 }
diff --git a/indra/llcommon/tests/lltreeiterators_test.cpp b/indra/llcommon/tests/lltreeiterators_test.cpp
index 7a2adfd8ba..6734596d25 100644
--- a/indra/llcommon/tests/lltreeiterators_test.cpp
+++ b/indra/llcommon/tests/lltreeiterators_test.cpp
@@ -32,6 +32,7 @@
 
 // STL headers
 // std headers
+#include <functional>
 #include <iostream>
 #include <sstream>
 #include <string>
@@ -915,7 +916,7 @@ struct WalkExpected<LLTreeIter::BFS>: public Expected
 template <class NODE, typename CHILDITER>
 typename LLPtrTo<NODE>::type
 get_B2b(const typename LLPtrTo<NODE>::type& root,
-        const boost::function<CHILDITER(const typename LLPtrTo<NODE>::type&)>& child_begin)
+        const std::function<CHILDITER(const typename LLPtrTo<NODE>::type&)>& child_begin)
 {
     typedef typename LLPtrTo<NODE>::type NodePtr;
     CHILDITER Bi(child_begin(root));