SL-17657: Merge branch 'more-c++17' into DRTVWR-568.

Converting on DRTVWR-568 as the project branch going forward.

indra/cmake/Copy3rdPartyLibs.cmake

@@ -156,6 +156,7 @@ elseif(DARWIN)
     # Support our "@executable_path/../Resources" load path for executables
     # that end up in any of the above SHARED_LIB_STAGING_DIR_MUMBLE
     # directories.
+    file(MAKE_DIRECTORY "${SHARED_LIB_STAGING_DIR}")
     file(CREATE_LINK "Release/Resources" "${SHARED_LIB_STAGING_DIR}/Resources"
          SYMBOLIC)
 

indra/test/CMakeLists.txt

@@ -121,6 +121,8 @@ elseif (DARWIN)
   # executable. This SHOULD properly be "$<TARGET_FILE_DIR:lltest>/Resources",
   # but the CMake $<TARGET_FILE_DIR> generator expression isn't evaluated by
   # CREATE_LINK, so fudge it.
+  # Make sure the symlink's parent directory exists...
+  file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/test")
   file(CREATE_LINK "../sharedlibs/Release/Resources" "${CMAKE_BINARY_DIR}/test/Resources"
        SYMBOLIC)
 endif (WINDOWS)