cmake: Compiler-specific whole-archive macro

CMakeLists.txt

@@ -89,6 +89,7 @@ endif(EXISTS ${PROJECT_SOURCE_DIR}/.git)
 
 # Macros
 include(OpenMWMacros)
+include(WholeArchive)
 
 # doxygen main page
 

apps/opencs/CMakeLists.txt

@@ -237,8 +237,8 @@ if(OSG_STATIC)
         target_link_libraries(openmw_cs_osg_plugins INTERFACE ${${_plugin_uc}_LIBRARY})
     endforeach()
     # We use --whole-archive because OSG plugins use registration.
-    target_link_options(openmw_cs_osg_plugins INTERFACE
-        -Wl,--whole-archive ${_osg_plugins_static_files} -Wl,--no-whole-archive)
+    get_whole_archive_options(_opts ${_osg_plugins_static_files})
+    target_link_options(openmw_cs_osg_plugins INTERFACE ${_opts})
     target_link_libraries(openmw-cs openmw_cs_osg_plugins)
 endif(OSG_STATIC)
 

apps/openmw/CMakeLists.txt

@@ -152,8 +152,8 @@ if(OSG_STATIC)
         target_link_libraries(openmw_osg_plugins INTERFACE ${${_plugin_uc}_LIBRARY})
     endforeach()
     # We use --whole-archive because OSG plugins use registration.
-    target_link_options(openmw_osg_plugins INTERFACE
-        -Wl,--whole-archive ${_osg_plugins_static_files} -Wl,--no-whole-archive)
+    get_whole_archive_options(_opts ${_osg_plugins_static_files})
+    target_link_options(openmw_osg_plugins INTERFACE ${_opts})
     target_link_libraries(openmw openmw_osg_plugins)
 endif(OSG_STATIC)
 

cmake/WholeArchive.cmake

@@ -0,0 +1,10 @@
+macro (get_whole_archive_options OUT_VAR)
+    # We use --whole-archive because OSG plugins use registration.
+    if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+        set(${OUT_VAR} -Wl,--whole-archive ${ARGN} -Wl,--no-whole-archive)
+    elseif (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+        set(${OUT_VAR} -Wl,-all_load ${ARGN} -Wl,-noall_load)
+    else ()
+        message(FATAL_ERROR "get_whole_archive_options not implemented for CMAKE_CXX_COMPILER_ID ${CMAKE_CXX_COMPILER_ID}")
+    endif()
+endmacro (whole_archive_options)