Add __wur to GNU version of strerror_r.

Not using the result of the GNU strerror_r() is always a mistake. Moreover this would generate warning if XSI version was expected but GNU version was used instead (because some random used header defined _GNU_SOURCE which was Python.h in this case).
git-mirror · Jun 15, 2012 · a3aeac4 · a3aeac4
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,7 @@
+2012-06-15  Cyril Hrubis  <metan@ucw.cz>
+
+	* string/string.h: Add __wur to GNU version of strerror_r.
+
 2012-06-14  H.J. Lu  <hongjiu.lu@intel.com>
 
 	[BZ #14229]

diff --git a/string/string.h b/string/string.h
@@ -1,5 +1,4 @@
-/* Copyright (C) 1991-1993,1995-2004,2007,2009,2010,2012
-   Free Software Foundation, Inc.
+/* Copyright (C) 1991-2012 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -433,7 +432,7 @@ extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen)
 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
    used.  */
 extern char *strerror_r (int __errnum, char *__buf, size_t __buflen)
-     __THROW __nonnull ((2));
+     __THROW __nonnull ((2)) __wur;
 # endif
 #endif