ENH: use c++ with c++ and c flags with c

Modules/Platform/Darwin.cmake

@@ -13,13 +13,13 @@ IF("${CMAKE_BACKWARDS_COMPATIBILITY}" MATCHES "^1\\.[0-6]$")
 ENDIF("${CMAKE_BACKWARDS_COMPATIBILITY}" MATCHES "^1\\.[0-6]$")
 
 SET(CMAKE_CXX_CREATE_SHARED_LIBRARY
-      "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS> <LINK_FLAGS> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
+      "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <LINK_FLAGS> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
 
 SET(CMAKE_C_CREATE_SHARED_LIBRARY
       "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS> <LINK_FLAGS> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
 
 SET(CMAKE_CXX_CREATE_SHARED_MODULE
-      "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_MODULE_CREATE_C_FLAGS> <LINK_FLAGS> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
+      "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS> <LINK_FLAGS> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
 
 SET(CMAKE_C_CREATE_SHARED_MODULE
       "<CMAKE_C_COMPILER> <CMAKE_SHARED_MODULE_CREATE_C_FLAGS> <LINK_FLAGS> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")