Re: Build errors for older versions

[Andrew Pinski <pinskia@gmail.com>]

On Thu, Apr 25, 2024 at 4:21 AM Stefan Schulze Frielinghaus via Gcc
<gcc@gcc.gnu.org> wrote:
>
> Hi all,
>
> while bisecting I recently ran into build errors like
>
> In file included from /devel/gcc/libgcc/../gcc/tsystem.h:101,
>                  from /devel/gcc/libgcc/libgcov.h:42,
>                  from /devel/gcc/libgcc/libgcov-interface.c:26:
> /usr/include/stdlib.h:931:6: error: wrong number of arguments specified for 'malloc' attribute
>   931 |      __attr_dealloc_free __wur;
>       |      ^~~~~~~~~~~~~~~~~~~
> /usr/include/stdlib.h:931:6: note: expected between 0 and 0, found 2
>
> My host system is Fedora 39 on x86_64 while trying to build
> r11-3896-g61a43de58cb6de.  The error does not appear if I'm using e.g.
> Fedora 34.  Is this known and if so does there exist a workaround such
> that building older versions on a recent OS works?

Basically glibc's check for GCC version is only designed for released
versions of GCC. So bisecting GCC means sometimes that check will
break.
I have not fully looked into it but maybe glibc folks can provide a
workaround to disable the version check to assume a much older version
of GCC here.

Thanks,
Andrew Pinski

>
> Cheers,
> Stefan