ARC: build: Turn off -Wmaybe-uninitialized for ARC gcc 4.8
authorVineet Gupta <vgupta@synopsys.com>
Fri, 18 Mar 2016 08:28:01 +0000 (13:58 +0530)
committerVineet Gupta <vgupta@synopsys.com>
Fri, 18 Mar 2016 10:52:36 +0000 (16:22 +0530)
commita69fe1a2c9b2bd35046cb8f4e61337825cef9239
treeddc1955039d71a002a5f727ab798fdc3012548fb
parent667a490bdb6e27db0887d2ca515b907d6aa87118
ARC: build: Turn off -Wmaybe-uninitialized for ARC gcc 4.8

linux-next has been reporting gazillion warnings for ARC build and
I finally decided to take a bite:

http://kisskb.ellerman.id.au/kisskb/buildresult/12638735/

Most of the them are due to -Wmaybe-uninitialized

| ../kernel/sysctl.c: In function '__do_proc_doulongvec_minmax':
| ../kernel/sysctl.c:1928:12: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
|   ret = tmp - *buf;
|            ^
| ../kernel/sysctl.c:2342:29: note: 'p' was declared here
|  char *kbuf = NULL, *p;
|                     ^
| ...
| ...

Cursory look at code seemed fine and a definite gcc false positive in say
kernel/sysctl.c

Mystery was why only for ARC (and not with ARM linaro toolchain based
off same gcc 4.8). Turns out that -O3 (default for ARC) triggers these
and if I enable -O3 for ARM kernel build, I see the same splat.

I initially wanted to disable this only for gcc 4.8, but Arnd reported
it is seen even on gcc 6.0 for ARM with -O3. Thus better to disable
this independent of gcc version.

Cc: Claudiu Zissulescu <Claudiu.Zissulescu@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-kbuild@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
arch/arc/Makefile
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