gccmacro: Disable printf-like format checking on mingw32 compilers.

Am 23.10.2012 08:25, schrieb Arun Raghavan:
> On Tue, 2012-08-21 at 13:32 +0200, Thomas Martitz wrote:
>> Am 21.08.2012 08:51, schrieb Rémi Denis-Courmont:
>>> Le mardi 21 août 2012 00:50:34 Thomas Martitz, vous avez écrit :
>>>> There are tons of warnings, most of them because the function is not
>>>> recognized as printf-like.
>>> Removing checks looks very fishy.
>>>
>>> To use C99 and/or GNU format specifiers on MingW, you need to use the
>>> gnuprintf attribute instead of printf. With printf, the format string is
>>> validated according to the antiquated MSVC rules.
>>>
>> Interesting, I didn't know about gnuprintf. FWIW, what are those
>> antiquated MSVC rules? I assumed the return value which isn't int for
>> some affected functions?
> Is this one going to be respun?
>

Yes, here you go.

>From c5f15eec69bf95c9a1261e0d82abbd039156e75e Mon Sep 17 00:00:00 2001
From: Thomas Martitz <kuge@rockbox.org>
Date: Wed, 8 Aug 2012 17:38:04 +0200
Subject: [PATCH 1/3] gccmacro: Work around warnings due to printf redirection
 by libintl.

Libintl defines printf as libintl_printf, which breaks the format
attribue. Unfortunately the workaround around provided by libintl
is only enabled for cygwin, but not for mingw builds. Therefore
install the workaround manually.

src/pulse/gccmacro.h

@@ -25,8 +25,15 @@
 /** \file
  * GCC attribute macros */
 
-#ifdef __GNUC__
+#if defined(__GNUC__)
+#ifdef __MINGW32__
+/* libintl overrides printf with a #define. As this breaks this attribute,
+ * it has a workaround. However the workaround isn't enabled for MINGW
+ * builds (only cygwin) */
+#define PA_GCC_PRINTF_ATTR(a,b) __attribute__ ((format (__printf__, a, b)))
+#else
 #define PA_GCC_PRINTF_ATTR(a,b) __attribute__ ((format (printf, a, b)))
+#endif
 #else
 /** If we're in GNU C, use some magic for detecting invalid format strings */
 #define PA_GCC_PRINTF_ATTR(a,b)