[PATCH] PR12463 : Warnings about nonsensical comparisons are disabled if macro expansion is involved #2

[Lubos Lunak]

 This is a reduced version of the original patch for PR12463 that handles only 
string comparisons (I don't care about arrays enough to deal with the details 
and there the problem is unlikely to happen anyway, but the problem is more 
likely with strings if e.g. refactoring).

-- 
 Lubos Lunak
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