[llvm-commits] [PATCH] work around a nasty g++/glibc incompatiblity

[Benjamin Kramer]

glibc has two versions of strerror_r, a standards compliant one and a  
GNU specific one. The GNU one is chosen when _GNU_SOURCE is defined. g+ 
+ always defines _GNU_SOURCE on linux platforms because glibc's  
headers won't compile in C++ mode without it. The GNU strerror_r  
doesn't always modify the buffer which causes empty error messages on  
linux. The attached patch fixes this by falling back to the less  
threadsafe method if _GNU_SOURCE is defined.

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