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perf tools: check if -DFORTIFY_SOURCE=2 is allowed

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It seems gcc (4.7.2) defines _FORTIFY_SOURCE internally and becomes
confused when it sees another definition in flags.

For me, build failed like this:

CHK glibc
Makefile:548: *** No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static. Stop.

and only with V=1 it printed:

<command-line>:0:0: error: "_FORTIFY_SOURCE" redefined [-Werror]
<stdin>:1:0: note: this is the location of the previous definition

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1361113416-8662-1-git-send-email-marcin.slusarz@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Marcin Slusarz 2013-02-17 16:03:36 +01:00 committed by Arnaldo Carvalho de Melo
parent 5f7439e078
commit d2f32479e5
1 changed files with 7 additions and 1 deletions
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8
tools/perf/Makefile
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@ -95,7 +95,7 @@ ifeq ("$(origin DEBUG)", "command line")
PERF_DEBUG = $(DEBUG)
endif
ifndef PERF_DEBUG
CFLAGS_OPTIMIZE = -O6 -D_FORTIFY_SOURCE=2
CFLAGS_OPTIMIZE = -O6
endif
ifdef PARSER_DEBUG
@ -180,6 +180,12 @@ ifeq ($(call try-cc,$(SOURCE_HELLO),$(CFLAGS) -Werror -Wvolatile-register-var,-W
CFLAGS := $(CFLAGS) -Wvolatile-register-var
endif
ifndef PERF_DEBUG
ifeq ($(call try-cc,$(SOURCE_HELLO),$(CFLAGS) -D_FORTIFY_SOURCE=2,-D_FORTIFY_SOURCE=2),y)
CFLAGS := $(CFLAGS) -D_FORTIFY_SOURCE=2
endif
endif
### --- END CONFIGURATION SECTION ---
ifeq ($(srctree),)