macOS: support building blender-thumbnailer

It was missing framework flags added in `setup_platform_linker_flags`.
Keep it off until QuickLook Thumbnailing is implemented.

Differential Revision: https://developer.blender.org/D13997

CMakeLists.txt

@@ -157,8 +157,9 @@ option(WITH_BLENDER "Build blender (disable to build only the blender player)" O
 mark_as_advanced(WITH_BLENDER)
 
 if(APPLE)
-  # Currently this causes a build error linking, disable.
-  set(WITH_BLENDER_THUMBNAILER OFF)
+  # In future, can be used with `quicklookthumbnailing/qlthumbnailreply` to create file
+  # thumbnails for say Finder. Turn it off for now.
+  option(WITH_BLENDER_THUMBNAILER "Build \"blender-thumbnailer\" thumbnail extraction utility" OFF)
 elseif(WIN32)
   option(WITH_BLENDER_THUMBNAILER "Build \"BlendThumb.dll\" helper for Windows explorer integration" ON)
 else()

source/blender/blendthumb/CMakeLists.txt

@@ -65,6 +65,7 @@ else()
   )
 
   add_executable(blender-thumbnailer ${SRC} ${SRC_CMD})
+  setup_platform_linker_flags(blender-thumbnailer)
   target_link_libraries(blender-thumbnailer bf_blenlib)
   target_link_libraries(blender-thumbnailer ${PTHREADS_LIBRARIES})
 endif()

source/creator/CMakeLists.txt

@@ -1082,6 +1082,13 @@ elseif(APPLE)
     Blender.app/Contents/
   )
 
+  if(WITH_BLENDER_THUMBNAILER)
+      install(
+        TARGETS blender-thumbnailer
+        DESTINATION Blender.app/Contents/MacOS/
+      )
+  endif()
+
   if(WITH_OPENMP AND OPENMP_CUSTOM)
     install(
       FILES "${OpenMP_LIBRARY}"