linux-kernel - Re: [PATCH] tools/lib/api: undefine _FORTIFY

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Date:	Mon, 20 Apr 2015 15:00:36 -0400
From:	Bobby Powers <bobbypowers@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>, linux-kbuild@...r.kernel.org
Cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] tools/lib/api: undefine _FORTIFY_SOURCE before setting it

+CC linux-kbuild.  Related to this Dirk's work [1].

On Sat, Apr 18, 2015 at 11:05 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> On Sat, Apr 18, 2015 at 10:46:20AM -0400, Bobby Powers wrote:
>> Some toolchains (like Hardened Gentoo) define _FORTIFY_SOURCE in the
>> built-in, default args.  This causes perf builds to fail with:
>>
>> <command-line>:0:0: error: "_FORTIFY_SOURCE" redefined [-Werror]
>> <built-in>: note: this is the location of the previous definition
>> cc1: all warnings being treated as errors
>>
>> To avoid this, undefine _FORTIFY_SOURCE before (possibly
>> re-)defining it in tools/lib/api.
>>
>> Signed-off-by: Bobby Powers <bobbypowers@...il.com>
>
> Acked-by: Jiri Olsa <jolsa@...nel.org>
>
> thanks,
> jirka


yours,
Bobby

1 - https://lkml.org/lkml/2015/4/20/269

>
>> ---
>>  tools/lib/api/Makefile | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/lib/api/Makefile b/tools/lib/api/Makefile
>> index 36c08b1..87c72d1 100644
>> --- a/tools/lib/api/Makefile
>> +++ b/tools/lib/api/Makefile
>> @@ -21,7 +21,7 @@ LIB_OBJS += $(OUTPUT)fd/array.o
>>
>>  LIBFILE = libapikfs.a
>>
>> -CFLAGS = -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2 $(EXTRA_WARNINGS) $(EXTRA_CFLAGS) -fPIC
>> +CFLAGS = -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 $(EXTRA_WARNINGS) $(EXTRA_CFLAGS) -fPIC
>>  EXTLIBS = -lelf -lpthread -lrt -lm
>>  ALL_CFLAGS = $(CFLAGS) $(BASIC_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
>>  ALL_LDFLAGS = $(LDFLAGS)
>> --
>> 2.3.5
>>
--
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