[cfe-commits] Patch - Make -Wfour-char-constants only apply to Darwin

[Craig Topper]

Currently -Wfour-char-constants applies to all OSs. Looking at Apple's
GCC support for -Wfour-char-constant, I think that it gets enabled by
default for all OSs except darwin. Bit difficult to determine since
four-char-constants only exists in Apple's GCC branch. Since this GCC
change seems to be Apple/Darwin specific it seems like clang should
default to warning on 4 character constants on other OSs.

The attached patch checks for Darwin when doing the 4 character check
on character literals. If not Darwin, it will use the Wmultichar
diagnostic four 4 character literals instead.

-- 
~Craig
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