[Bug build/15823] rpcgen should have an option to control explicit CPP program

["vapier at gentoo dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=15823

Mike Frysinger <vapier at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Host rpcgen is sort of      |rpcgen should have an
                   |fundamentally broken for    |option to control explicit
                   |cross-compilers             |CPP program

--- Comment #11 from Mike Frysinger <vapier at gentoo dot org> ---
what if we changed -Y behavior:
- stat the input arg
- if it's a dir, append "/cpp" automatically like we do today
- if it's a file, use the value unmodified
- throw an error otherwise
- update or delete find_cpp logic

there is the question of how do we pass down CPPFLAGS.  we could add an
explicit flag like -y, or we could further extend the -Y behavior so that,
instead of throwing an error, we split on whitespace.

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