[PATCH] tools/perf/Makefile: drop _FORTIFY_SOURCE right before redefinition

[Sergei Trofimovich]

From: Sergei Trofimovich <slyfox@xxxxxxxxxx>

Gentoo's toolchain sets _FORTIFY_SOURCE by default
which leads to very obscure error:

perf # make clean && make
Makefile:455: No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev
Makefile:470: *** No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static.  Stop

Patch explicitely undefines _FORTIFY_SOURCE. Thanks!

CC: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
CC: Paul Mackerras <paulus@xxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxxxxx>
CC: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sergei Trofimovich <slyfox@xxxxxxxxxx>
---
 tools/perf/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 891bc77..60f083d 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -94,7 +94,7 @@ ifeq ("$(origin DEBUG)", "command line")
   PERF_DEBUG = $(DEBUG)
 endif
 ifndef PERF_DEBUG
-  CFLAGS_OPTIMIZE = -O6 -D_FORTIFY_SOURCE=2
+  CFLAGS_OPTIMIZE = -O6 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2
 endif
 
 ifdef PARSER_DEBUG
-- 
1.8.0

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