Bug#903694: bootstrap issue

[Matthias Klose <doko@debian.org>]

On 19.07.2018 21:37, Nicolas Boulenguez wrote:
> gnat-7/7.3.0-26 wrongly assumes that /usr/bin/gcc links to gcc-7.
> By chance, this currently holds in unstable,
> and gcc-7 is hopefully able to build a fixed version of itself.
> 
> gnat-8/8.1.0-11 wrongly assumes that /usr/bin/gcc links to gcc-8.
> It is broken in unstable, at least with default options.
> 
> So the fresh gcc-8/8.1.0-12 fails to build with gcc-8/8.1.0-11.

gcc-defaults pointing to GCC 8 is now in unstable.  I assume we can wait until
it is installed in the buildd chroots, and then retry the build?

it looks like the ports architectures already picked up that change.

> I suggest that
>   gcc-8/8.1.0-13 Build-Depends: gcc-7
> again until 8.1.0-13 is available on all architectures, then
>   gcc-8/8.1.0-14 Build-Depends: gcc-8 (>= 8.1.0-13)
> 
> Another option is to append --GCC=gcc-8 --GNATLINK=gnatlink-8 etc to
> each /usr/bin/gnatmake invokation.  A second upload would also be
> necessary once the fixed gnat-8 is available, in order to remove the
> options, because such work-arounds have repeatedly resulted in broken
> crosss-builds or bootstraps.
>