[Bug translator/18462] macro deprecation

[mcermak at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18462

--- Comment #2 from Martin Cermak <mcermak at redhat dot com> ---
(In reply to Josh Stone from comment #1)
> I think it would be perfectly reasonable to relax this constraint, to allow
> preprocessor conditionals at the top level of macro files.

If I'm not missing something, this isn't going be a oneliner. My impression is
that parser::scan_pp1() will need to get extended in a way that it understands
conditionals. Which essentially means to duplicate parts of logic implemented
in parser::scan_pp(), or resp. in eval_pp_conditional(), into
parser::scan_pp1(). Does it sound reasonably?

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