Tool chain configuration: GNU/* sharing stuff with GNU/Linux

[Thomas Schwinge <tschwinge at gnu dot org>]

Hello!

It is currently unclear whether GNU/Hurd, GNU/k*BSD, or GNU/* in general
should share stuff (like configuration branches inside `config.gcc',
files from `config/') with GNU/Linux.  This is -- because of the targets
being pretty much similar -- how it used to be done in the past.  But now
GCC's Andrew Pinski indicated that this shall no longer be desired, for
example in <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28102>.

Contrary to Andrew, I would vote for all those GNU/* targets sharing the
same configuration machinery, as they are indeed meant to be as close to
each other as possible.

To give an example: all the GNU/* configurations use the `config/linux.h'
file, even though only one of the possible GNU/* configurations is
actually a Linux one.  Additionally the non-Linux ones currently have
files like `config/gnu.h' (for GNU/Hurd) or `config/kfreebsd-gnu.h' (for
GNU/kFreeBSD) to customize what is different for them from the main Linux
configuration file.

To state this intended similarity clearly, one could rename, e.g.,
`config/linux.h' to `config/gnu-shared.h' and then have a new (nearly
empty) file `config/linux.h' additionally to the existing `config/gnu.h',
`config/kfreebsd-gnu.h', etc. to do the remaining few customizations.

I'd offer (and already began) to work on this.  Please comment.


Regards,
 Thomas

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