Bug#900554: gcc-8: don't do a full build for binary-indep builds

[Matthias Klose <doko@debian.org>]

On 01.06.2018 10:44, Emilio Pozuelo Monfort wrote:
> Source: gcc-8
> Version: 8.1.0-5
> Severity: normal
>
> Hi,
>
> gcc-8 arch:all builds take up to 20h because they do a full build, only
> to ship the arch-indep packages:
>
>   gcc-8-locales deb devel optional arch=all
>   gcc-8-source deb devel optional arch=all
>   libgccjit-8-doc deb doc optional arch=all
>   libstdc++-8-doc deb doc optional arch=all
>
> It doesn't look like any of those would need to build all of GCC, so it
> should be possible to split the -indep/-arch targets so that a binary-indep
> build just does the minimum stuff it needs to build the above packages.

building the docs is part of the upstream build process, so I don't think you 
can avoid these.  What you could do, is:

 - not running the checks
 - not building the hppa64 cross compiler
 - not building the nvptx offload compiler
 - not bootstrapping the compiler (nostrap)
 - not building some frontends

patches tested with -A, -B and -b would be welcome.