linux-kernel - Re: [PATCH] tools/lib/api/Makefile: Add feature check for _FORTIFY

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Date:	Mon, 20 Apr 2015 20:16:31 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dirk Gouders <dirk@...ders.net>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/lib/api/Makefile: Add feature check for
 _FORTIFY_SOURCE


* Dirk Gouders <dirk@...ders.net> wrote:

> For example on Gentoo systems where _FORTIFY_SOURCE is set by default,
> `make -C tools/perf' fails, because of the macro being redefined.
> 
> Fix that by a feature-check analogous to tools/perf/config/Makefile.
> 
> Signed-off-by: Dirk Gouders <dirk@...ders.net>
> ---
>  tools/lib/api/Makefile | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/lib/api/Makefile b/tools/lib/api/Makefile
> index d8fe29f..acf9097 100644
> --- a/tools/lib/api/Makefile
> +++ b/tools/lib/api/Makefile
> @@ -16,7 +16,14 @@ MAKEFLAGS += --no-print-directory
>  LIBFILE = $(OUTPUT)libapi.a
>  
>  CFLAGS := $(EXTRA_WARNINGS) $(EXTRA_CFLAGS)
> -CFLAGS += -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2 -fPIC
> +CFLAGS += -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -fPIC
> +
> +ifeq ($(DEBUG),0)
> +  ifeq ($(feature-fortify-source), 1)
> +    CFLAGS += -D_FORTIFY_SOURCE=2
> +  endif
> +endif

So how about undefining it instead and re-defining it as 
_FORTIFY_SOURCE=2?

Just in case a distro sets a weaker version - lets not accept that 
weaker setting. We've always had the stronger version of it.

Thanks,

	Ingo
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