[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]

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

--- Comment #3 from Daniel Santos <daniel.santos at pobox dot com> ---
(In reply to Martin Liška from comment #1)
> I can take a look later for GCC 8.0.

Thank you Martin!  I still don't understand enough of gcc to be able to do this
in any reasonable time frame and I've only worked with the i386 backend thus
far.