Update config.h.win32(.in)

Define _GDK_EXTERN more in line with the definition of it on Windows as
defined in configure.ac, and add a MinGW variant for it as well

diff --git a/config.h.win32.in b/config.h.win32.in
index 77b80aaff2120cf26d69c10c9f254907daf39b9d..3ab94022dd67329a8758d76904e7022e8ec3638f 100644 (file)
--- a/config.h.win32.in
+++ b/config.h.win32.in
@@ -305,7 +305,11 @@
 /* #undef _FILE_OFFSET_BITS */
 
 /* defines how to decorate public symbols while building */\r
-#define _GDK_EXTERN __declspec (dllexport)
+#ifdef _MSC_VER
+#define _GDK_EXTERN __declspec (dllexport) extern
+#else
+#define _GDK_EXTERN __attribute__((visibility("default")))  __declspec (dllexport) extern
+#endif
 
 /* Define for large files, on AIX-style hosts. */
 /* #undef _LARGE_FILES */