[cfe-commits] [Patch] Warn about C90 doubly-qualified types in more situations

[Tim Northover]

Hi,

C90 annoyingly requires a diagnostic to be produced for any type that ends up 
with two copies of the same type-qualifier. This warning is already produced 
for cases which can be detected during parsing, but when it happens via a 
typedef Sema needs to be involved.

I believe this patch implements the correct note, though I was uncertain how 
best to test for C90 only compilation: is !C99 && !C++ & !ObjC correct?

Could someone take a look at the patch?

Thanks.

Tim.
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