perf tools: Fix build against newer glibc

Upstream glibc commit 295e904 added a definition for __attribute_const__
to cdefs.h.  This causes the following error when building perf:

util/include/linux/compiler.h:8:0: error: "__attribute_const__"
redefined [-Werror] /usr/include/sys/cdefs.h:226:0: note: this is the
location of the previous definition

Wrap __attribute_const__ in #ifndef as we do for __always_inline.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110818113720.GL2227@zod.bos.redhat.com
Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/include/linux/compiler.h b/tools/perf/util/include/linux/compiler.h
index 791f9dd27ebffd3166f6535c629c0595d073b3db..547628e97f3d2ac4aacf85485f8e5d790575c042 100644 (file)
--- a/tools/perf/util/include/linux/compiler.h
+++ b/tools/perf/util/include/linux/compiler.h
@@ -5,7 +5,9 @@
 #define __always_inline        inline
 #endif
 #define __user
+#ifndef __attribute_const__
 #define __attribute_const__
+#endif
 
 #define __used         __attribute__((__unused__))