Check if GNC is defined before checking its value to solve warns in msvc
diff --git a/include/SDL_assert.h b/include/SDL_assert.h
index 427c4c6..e71cf97 100644
--- a/include/SDL_assert.h
+++ b/include/SDL_assert.h
@@ -71,7 +71,7 @@ assert can have unique static variables associated with it.
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 supports __func__ as a standard. */
# define SDL_FUNCTION __func__
-#elif ((__GNUC__ >= 2) || defined(_MSC_VER) || defined (__WATCOMC__))
+#elif ((defined(__GNUC__) && (__GNUC__ >= 2)) || defined(_MSC_VER) || defined (__WATCOMC__))
# define SDL_FUNCTION __FUNCTION__
#else
# define SDL_FUNCTION "???"
diff --git a/include/begin_code.h b/include/begin_code.h
index 6c2f096..b3e69e8 100644
--- a/include/begin_code.h
+++ b/include/begin_code.h
@@ -34,7 +34,7 @@
#define _begin_code_h
#ifndef SDL_DEPRECATED
-# if (__GNUC__ >= 4) /* technically, this arrived in gcc 3.1, but oh well. */
+# if defined(__GNUC__) && (__GNUC__ >= 4) /* technically, this arrived in gcc 3.1, but oh well. */
# define SDL_DEPRECATED __attribute__((deprecated))
# else
# define SDL_DEPRECATED