[PATCH] Allow "redefinition" of typedef of anon tag from unimported submodule

[Ben Langmuir via cfe-commits]

This time sending to the right list address.

> On Nov 13, 2015, at 4:00 PM, Ben Langmuir <blangmuir at apple.com> wrote:
> 
> Hey Richard,
> 
> After your commit r233345 we started diagnosing “redefinition” errors for typedefs of anonymous tags that are *not visible* in case like this:
> 
> module that isn’t imported:
>   typedef struct { … } Foo_t;
> source file:
>   typedef struct { … } Foo_t;
> 
> I think the only change needed is to not consider these anonymous tags to be the same entity unless we’re in C++.  Patch attached.
> 
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> Ben