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.
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/
