perf tools: check if -DFORTIFY_SOURCE=2 is allowed
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>
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@ -95,7 +95,7 @@ ifeq ("$(origin DEBUG)", "command line")
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PERF_DEBUG = $(DEBUG)
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endif
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ifndef PERF_DEBUG
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CFLAGS_OPTIMIZE = -O6 -D_FORTIFY_SOURCE=2
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CFLAGS_OPTIMIZE = -O6
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endif
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ifdef PARSER_DEBUG
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@ -180,6 +180,12 @@ ifeq ($(call try-cc,$(SOURCE_HELLO),$(CFLAGS) -Werror -Wvolatile-register-var,-W
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CFLAGS := $(CFLAGS) -Wvolatile-register-var
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endif
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ifndef PERF_DEBUG
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ifeq ($(call try-cc,$(SOURCE_HELLO),$(CFLAGS) -D_FORTIFY_SOURCE=2,-D_FORTIFY_SOURCE=2),y)
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CFLAGS := $(CFLAGS) -D_FORTIFY_SOURCE=2
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endif
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endif
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### --- END CONFIGURATION SECTION ---
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ifeq ($(srctree),)
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