[Bug driver/81519] Enhancement: Add --help=target-distcc or similar to dump clean, optimal CFLAGS without using -march=native

["daniel.santos at pobox dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81519

--- Comment #6 from Daniel Santos <daniel.santos at pobox dot com> ---
(In reply to Martin Liška from comment #4)
> Ok, so I've briefly investigated source code and providing such information
> is definitely not a simple task :/

Sorry for my late response and thanks for looking into this.  I too was a bit
daunted when I started to investigate this just for the i386 back-end as there
were a lot of twists and turns, 64-bit bitmasks that were out of bits requiring
hack-arounds to add new processors, etc.

Maybe a nice-to-have would be a generic middle-end mechanism to manage this for
all back-ends in a universal fashion so that this type of thing would be much
easier to handle.  Of course, that would require an awfully large amount of
analysis in order to create a design that works *and* makes sense for everyone,
but such a design could also do a better job of things such as representing the
linage of a microarchitecture, accessing the processor_costs, etc.