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Re: [PATCH] Fix PR preprocessor/15167

> I think f->buffer_valid is supposed to be reset by _cpp_stack_file.
> How did it get this far with buffer_valid true?

I'm not sure I understand: this is a #pragma-onced header so it cannot be 
restacked.  Moreover, the problem is that it is included from two different 
directories, so two _cpp_file objects are allocated.

> You're allowed to create a test case made up of five files (and/or
> directories) if you need to.  Several tests in gcc.dg/cpp are already
> like that.  And it would help me review this if you showed an example,
> so that I could see how this was happening.

OK.  Attached.

-- 
Eric Botcazou

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