Support Library Requirements for GCC 10

[Richard Biener]

On Sun, Jan 5, 2020 at 9:28 PM Bruno Haible <bruno@clisp.org> wrote:
>
> Hi,
>
> The minimum support library version of MPC for building GCC 10 is not
> correct.
>
> After downloading gcc-10-20191229.tar.xz and
>   $ cd gcc-10-20191229/gcc/doc
>   $ ./install.texi2html
>   $ xdg-open HTML/prerequisites.html
> I installed
>   - gmp 4.3.2 - works,
>   - mpfr 3.1.0 - works,
>   - mpc 0.8.1 - fails!
>
> The failure has been reported already in [1]. The fix is to use
>
>   - mpc 1.0.3 - works.

Indeed.  I checked 0.8.2 and it doesn't work, I checked 1.0.1 and that does
so I adjusted it to 1.0.1 or later.

Richard.

> This wastes some time for everyone who attempts to install GCC 10 from
> scratch.
>
> In [2] it was suggested to look in the contrib/download_prerequisites script.
> This script indeed contains
>
>   mpc='mpc-1.0.3.tar.gz'
>
> Additionally, the mpc-0.8.1 release is so old that it is not (or no longer)
> on ftp.gnu.org [3].
>
> Therefore I would suggest
>   1) to change the documentation (HTML/prerequisites.html) in the GCC 10
>      snapshots to mention mpc-1.0.3 instead of mpc-0.8.1,
>   2) likewise, change https://gcc.gnu.org/install/prerequisites.html
>      to mention mpc-1.0.3 instead of mpc-0.8.1.
>
> Bruno
>
> [1] https://gcc.gnu.org/ml/gcc/2017-05/msg00022.html
> [2] https://gcc.gnu.org/ml/gcc/2017-05/msg00024.html
> [3] https://ftp.gnu.org/gnu/mpc/
>
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