[PATCH] Fix perf build against newer glibc

[Josh Boyer]

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.

Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxx>
---
 tools/perf/util/include/linux/compiler.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/include/linux/compiler.h b/tools/perf/util/include/linux/compiler.h
index 791f9dd..547628e 100644
--- 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__))
 
-- 
1.7.6

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