[cfe-commits] [PATCH] Assert that redeclarations have the same linkage.

[Rafael Espíndola]

> For example, in
>
> extern "C" {
>   namespace {
>    extern int x2;
>   }
> }
> namespace {
>   int x2;
> }
>
> Should Var->getDeclContext()->isExternCContext() return true for the second
> decl?

I figured that the contexts should probably remain different given
that it is used to test if a decl is out of line. I have implemented
checking for incompatible language linkages and now the extra
asserting should not cause any crashes.

A new patch is attached.

Cheers,
Rafael
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