BlocksRuntime: Export all NSConcrete* globals on Win32

CMakeLists.txt

@@ -57,10 +57,7 @@ add_library(BlocksRuntime
   src/BlocksRuntime/runtime.c)
 
 if(WIN32)
-  target_sources(BlocksRuntime PRIVATE
-    BlocksRuntime.def)
-
-  if(NOT BUILD_SHARED_LIBS)
+  if (NOT BUILD_SHARED_LIBS)
     target_compile_definitions(BlocksRuntime PUBLIC BlocksRuntime_STATIC)
     target_compile_options(BlocksRuntime PUBLIC
       "$<$<COMPILE_LANGUAGE:C,CXX>:SHELL:$<$<BOOL:${MSVC}>:-Xclang >-static-libclosure>"

src/BlocksRuntime/Block.h

@@ -52,13 +52,8 @@ BLOCK_EXPORT void _Block_object_assign(void *, const void *, const int);
 BLOCK_EXPORT void _Block_object_dispose(const void *, const int);
 
 // Used by the compiler. Do not use these variables yourself.
-#if defined(_WIN32)
-extern void * _NSConcreteGlobalBlock[32];
-extern void * _NSConcreteStackBlock[32];
-#else
 BLOCK_EXPORT void * _NSConcreteGlobalBlock[32];
 BLOCK_EXPORT void * _NSConcreteStackBlock[32];
-#endif
 
 #if __cplusplus
 }