windows: fix format string attributes on MinGW

MinGW maps the "printf" format string archetype to the non-standard
MSVCRT functions, even if __USE_MINGW_ANSI_STDIO is defined and set
to 1. We need to use "gnu_printf" to use the format strings as provided
by vsnprintf and similar functions to get correct warnings.

Since "gnu_printf" isn't necessarily available on other GCC compatible
compilers (such as clang), do this only on MinGW.

mp_msg.h

@@ -130,19 +130,15 @@ void mp_msg_init(void);
 int mp_msg_test(int mod, int lev);
 
 #include "config.h"
+#include "mpcommon.h"
 
 char *mp_gtext(const char *string);
 
 void mp_msg_va(int mod, int lev, const char *format, va_list va);
 
-#ifdef __GNUC__
-void mp_msg(int mod, int lev, const char *format, ... ) __attribute__ ((format (printf, 3, 4)));
-void mp_tmsg(int mod, int lev, const char *format, ... ) __attribute__ ((format (printf, 3, 4)));
-static inline void mp_dbg(int mod, int lev, const char *format, ...) __attribute__ ((format (printf, 3, 4)));
-#else // not GNU C
-void mp_msg(int mod, int lev, const char *format, ... );
-void mp_tmsg(int mod, int lev, const char *format, ...)
-#endif /* __GNUC__ */
+void mp_msg(int mod, int lev, const char *format, ... ) PRINTF_ATTRIBUTE(3, 4);
+void mp_tmsg(int mod, int lev, const char *format, ... ) PRINTF_ATTRIBUTE(3, 4);
+static inline void mp_dbg(int mod, int lev, const char *format, ...) PRINTF_ATTRIBUTE(3, 4);
 
 static inline void mp_dbg(int mod, int lev, const char *format, ...)
 {

mpcommon.h

@@ -31,6 +31,26 @@
 #define MP_RESIZE_ARRAY(ctx, p, count) do {     \
         p = talloc_realloc_size((ctx), p, (count) * sizeof(p[0])); } while (0)
 
+#ifdef __GNUC__
+
+/** Use gcc attribute to check printf fns.  a1 is the 1-based index of
+ * the parameter containing the format, and a2 the index of the first
+ * argument. **/
+#ifdef __MINGW32__
+// MinGW maps "printf" to the non-standard MSVCRT functions, even if
+// __USE_MINGW_ANSI_STDIO is defined and set to 1. We need to use "gnu_printf",
+// which isn't necessarily available on other GCC compatible compilers.
+#define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (gnu_printf, a1, a2)))
+#else
+#define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (printf, a1, a2)))
+#endif
+
+#else
+
+#define PRINTF_ATTRIBUTE(a1, a2)
+
+#endif
+
 extern const char *mplayer_version;
 
 #endif /* MPLAYER_MPCOMMON_H */

talloc.h

@@ -29,6 +29,8 @@
 #include <stdio.h>
 #include <stdarg.h>
 
+#include "mpcommon.h"
+
 /* HACK: libsmbclient uses dynamically linked libtalloc.so which has
  * identically named symbols. This name collision caused a crash under
  * stream_smb when trying to play anything with smb://. This hack
@@ -54,18 +56,6 @@ typedef void TALLOC_CTX;
 #define TALLOC_DEPRECATED 0
 #endif
 
-#ifndef PRINTF_ATTRIBUTE
-#if (__GNUC__ >= 3)
-/** Use gcc attribute to check printf fns.  a1 is the 1-based index of
- * the parameter containing the format, and a2 the index of the first
- * argument. Note that some gcc 2.x versions don't handle this
- * properly **/
-#define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
-#else
-#define PRINTF_ATTRIBUTE(a1, a2)
-#endif
-#endif
-
 /* try to make talloc_set_destructor() and talloc_steal() type safe,
    if we have a recent gcc */
 #if (__GNUC__ >= 3)