[PATCH] pr21217 - -fmodule-map-file should warn on non-existent file

[Richard Smith]

I played with this some more, and determined that the best place to load
the module map files is from the frontend rather than from header search; I
modified your patch to do that and landed it as r223561.

On Mon, Nov 24, 2014 at 6:00 PM, John Thompson <
john.thompson.jtsoftware at gmail.com> wrote:

> Sorry, I missed the hard tab, braces, and etc.  However, if I remove the
> clearing of the ModuleMapFiles member, one of the tests,
> Modules/modular_maps.cpp segfaults deep in some AST code, but only on
> running the test on Linux, so it's kind of hard to debug, not being much of
> a Linux/gdb guy.  Did I put this code in the right place?  I was kind of
> uncomfortable putting it in the HeaderSearch constructor, but it is a
> convenient place, since HeaderSearch has convenient members.  I don't see
> any other references to the ModuleMapFiles member, so I'm not sure what
> triggers the segfault only on Linux, unless it's some memory-stomping or
> post-free-write issue somewhere.
>
> http://reviews.llvm.org/D6324
>
> Files:
>   include/clang/Basic/DiagnosticLexKinds.td
>   lib/Lex/HeaderSearch.cpp
>   test/Modules/pr21217.cpp
>
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