loader: Fix MinGW compilation
Change-Id: I2a80ed83b0431be07cb6f992f4c8742a86aca294
diff --git a/loader/vk_loader_platform.h b/loader/vk_loader_platform.h
index a91c648..c697293 100644
--- a/loader/vk_loader_platform.h
+++ b/loader/vk_loader_platform.h
@@ -334,7 +334,23 @@
// Threads:
typedef HANDLE loader_platform_thread;
+
+// __declspec(thread) is not supported by MinGW compiler (ignored with warning or
+// cause erorr depending on compiler switches)
+//
+// __thread should be used instead
+//
+// __MINGW32__ defined for both 32 and 64 bit MinGW compilers, so it is enough to
+// detect any (32 or 64) flawor of MinGW compiler.
+//
+// @note __GNUC__ could be used as a more generic way to detect _any_
+// GCC[-compitible] compiler on Windows, but this fix was tested
+// only with MinGW, so keep it explicit at the moment.
+#if defined(__MINGW32__)
+#define THREAD_LOCAL_DECL __thread
+#else
#define THREAD_LOCAL_DECL __declspec(thread)
+#endif
// The once init functionality is not used when building a DLL on Windows. This is because there is no way to clean up the
// resources allocated by anything allocated by once init. This isn't a problem for static libraries, but it is for dynamic
