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From: Jonathan Wakely <jwakely.gcc@gmail.com>
Date: Thu, 26 May 2022 17:54:47 +0100
Message-ID: <CAH6eHdQFqpwunHVApyqSbjuzZEDeJr7E5vN3qJdusH7+6Ut+pA@mail.gmail.com>
Subject: Re: [SOLVED] Re: build GCC 12.1 failure on namespace from
 /usr/include/stdlib.h
To: Guy Moebs <guy.moebs@univ-nantes.fr>
Cc: gcc-help <gcc-help@gcc.gnu.org>
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On Thu, 19 May 2022 at 16:07, Guy Moebs via Gcc-help
<gcc-help@gcc.gnu.org> wrote:
>
> Hello,
>
>
> I have solved my problem and managed to compile gcc 11.3.0 and 12.1.0
> completely.
>
> In the output of the configure command I read :
>
> configure: WARNING: using in-tree isl, disabling version check
>
> So I add it to my configure command which is now
>
> ../gcc-12.1.0/configure --prefix=<path_to_install_dir>
> --disable-multilib --enable-threads=posix
> --enable-languages=c,c++,fortran,go --disable-isl-version-check
>
>
> and everything works fine.


I don't know why ISL causes that error, but you could probably also
use --without-isl (if you don't care about the optional graphite
optimizations that depend on isl).