[Buildroot] [PATCH] linux: disable -Werror when building host tools

[Peter Korsgaard]

>>>>> "Yann" == Yann E MORIN <yann.morin.1998 at free.fr> writes:

 > gcc-12 is starting to trickle down to some distros, like Archlinux.
 > gcc-12 has new warnings, and detects more cases of isues, like new
 > UAF cases, which is causing build issues in code that was previously
 > building fine, as reported in 14826:

 >     In file included from sigchain.c:3:
 >     In function 'xrealloc',
 >         inlined from 'sigchain_push.isra' at sigchain.c:26:2:
 >     subcmd-util.h:56:23: error: pointer may be used after 'realloc' [-Werror=use-after-free]
 >        56 |                 ret = realloc(ptr, size);
 >           |                       ^~~~~~~~~~~~~~~~~~
 >     subcmd-util.h:52:21: note: call to 'realloc' here
 >        52 |         void *ret = realloc(ptr, size);
 >           |                     ^~~~~~~~~~~~~~~~~~
 >     subcmd-util.h:58:31: error: pointer may be used after 'realloc' [-Werror=use-after-free]
 >        58 |                         ret = realloc(ptr, 1);
 >           |                               ^~~~~~~~~~~~~~~
 >     subcmd-util.h:52:21: note: call to 'realloc' here
 >        52 |         void *ret = realloc(ptr, size);
 >           |                     ^~~~~~~~~~~~~~~~~~

 > In that case, the kernel has already fixed their code, which is part of
 > 5.17:
 >     https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=52a9dab6d892763b2a8334a568bd4e2c1a6fde66

 > However, we can't easily carry that patch, because we don't know
 > whether the kernel the user uses already has the fix ir not.

 > Instead, we can just tell the kernel to disable use of -Werror when
 > building host tools.

 > As a consequence, we can drop it from the perf-specific setting.

 > Fixes: #14826

 > Reported-by: Anders Pitman <buildroot at apitman.com>
 > Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>

Committed to 2022.02.x, thanks.

-- 
Bye, Peter Korsgaard