Re: [PATCH v2] kbuild: support byacc as alternative YACC to bison

Hmm, this is unfortunate since there is no common way to
specify the header path directly.

I am not sure how much effort we should invent
to support non-GNU implementation
since we already rely on various GNU tools.

If we decide to support byacc,
we must carry the restriction
that bans GNU-extension.

In fact Linux now can be built without using GNU
binutils and using LLVM tools instead. It's just
one architecture and a specific config now, but
eventually the others will be built too. You can
follow the progress here:
https://github.com/ClangBuiltLinux/continuous-integration/issues/73

I believe that compatibility with different
alternative tools is a good thing as long as it
doesn't add unwanted complexity. And as this patch
is just changing command-line flags to their
portable variants and explicitly adds a couple of
definitions that are presumed by GNU bison, I
can't see a problem with it.

Regards,
Dmitry