# HG changeset patch
# User Paul Eggert <eggert@cs.ucla.edu>
# Date 1368658362 25200
# Node ID 26a04e61f5604fcd38aadfc00dc34d7990df281c
# Parent  c4e1bb6e391bb716a385bb7c02674400232afd57
stdio: use __REDIRECT for fwrite, fwrite_unlocked

* lib/stdio.in.h (fwrite):
When working around bug 11959, use __REDIRECT rather than '#define
fwrite(...) ... fwrite (...) ...'.  This is a more-targeted way to
fix the -Wunused-value issue with clang, and it works with GCC too.
Problem with targeting reported by Eric Blake in
<http://lists.gnu.org/archive/html/bug-gnulib/2013-05/msg00067.html>.
(fwrite_unlocked): Treat like fwrite.  I ran into this issue while
debugging the fwrite issue.

diff -r c4e1bb6e391b -r 26a04e61f560 ChangeLog
--- a/ChangeLog	Wed May 15 00:30:43 2013 -0700
+++ b/ChangeLog	Wed May 15 15:52:42 2013 -0700
@@ -1,5 +1,15 @@
 2013-05-15  Paul Eggert  <eggert@cs.ucla.edu>
 
+	stdio: use __REDIRECT for fwrite, fwrite_unlocked
+	* lib/stdio.in.h (fwrite):
+	When working around bug 11959, use __REDIRECT rather than '#define
+	fwrite(...) ... fwrite (...) ...'.  This is a more-targeted way to
+	fix the -Wunused-value issue with clang, and it works with GCC too.
+	Problem with targeting reported by Eric Blake in
+	<http://lists.gnu.org/archive/html/bug-gnulib/2013-05/msg00067.html>.
+	(fwrite_unlocked): Treat like fwrite.  I ran into this issue while
+	debugging the fwrite issue.
+
 	stdio: port --enable-gcc-warnings to clang
 	* lib/stdio.in.h (fwrite) [__clang__]: Ignore -Wunused-value entirely,
 	since the GCC workaround for fwrite does not pacify clang.
diff -r c4e1bb6e391b -r 26a04e61f560 lib/stdio.in.h
--- a/lib/stdio.in.h	Wed May 15 00:30:43 2013 -0700
+++ b/lib/stdio.in.h	Wed May 15 15:52:42 2013 -0700
@@ -582,13 +582,20 @@
    versions of gcc and clang, and is not needed for C++.  */
 #  if (0 < __USE_FORTIFY_LEVEL                                          \
        && __GLIBC__ == 2 && 4 <= __GLIBC_MINOR__ && __GLIBC_MINOR__ <= 15 \
+       && 3 < __GNUC__ + (4 <= __GNUC_MINOR__)                          \
        && !defined __cplusplus)
-#   ifdef __clang__
-#    pragma clang diagnostic ignored "-Wunused-value"
-#   elif 3 < __GNUC__ + (4 <= __GNUC_MINOR__)
-#    undef fwrite
-#    define fwrite(a, b, c, d) ({size_t __r = fwrite (a, b, c, d); __r; })
-#   endif
+#   undef fwrite
+#   undef fwrite_unlocked
+extern size_t __REDIRECT (rpl_fwrite,
+                          (const void *__restrict, size_t, size_t,
+                           FILE *__restrict),
+                          fwrite);
+extern size_t __REDIRECT (rpl_fwrite_unlocked,
+                          (const void *__restrict, size_t, size_t,
+                           FILE *__restrict),
+                          fwrite_unlocked);
+#   define fwrite rpl_fwrite
+#   define fwrite_unlocked rpl_fwrite_unlocked
 #  endif
 # endif
 _GL_CXXALIASWARN (fwrite);