[PATCH] Add --disable-werror

[Gao Xiang]

On Thu, Apr 21, 2022 at 12:10:18AM +0200, Fabrice Fontaine wrote:
> Add an option to disable -Werror to fix the following build failure with
> gcc 4.8 raised since version 1.4 and
> https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git/commit/?id=cf8be8a4352a5df3b3acf545af289cb47faa6de0:
> 
> In file included from /home/buildroot/autobuild/instance-0/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/string.h:636:0,
>                  from ../include/erofs/internal.h:242,
>                  from ../include/erofs/inode.h:11,
>                  from main.c:12:
> In function 'memset',
>     inlined from 'erofsdump_filetype_distribution.constprop.2' at main.c:583:9:
> /home/buildroot/autobuild/instance-0/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/bits/string3.h:81:30: error: call to '__warn_memset_zero_len' declared with attribute warning: memset used with constant zero length parameter; this could be due to transposed parameters [-Werror]
>        __warn_memset_zero_len ();
>                               ^
> 
> Fixes:
>  - http://autobuild.buildroot.org/results/4c776ec935bbb016231b6701471887a7c9ea79e9
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>

Thanks, applied with some minor commit message changes. And also
disable -Werror by default, since it's somewhat annoying on
(almost) every release due to various configuration combinations
which I couldn't cover all.

Thanks,
Gao Xiang