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Commit a2909684 authored by Mikhail Glushenkov's avatar Mikhail Glushenkov
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Check the return value of std::getenv. 

When constructing std::strings from C strings, we should check the input
value to be not NULL so that the std::string constructor does not
segfault.
Fixes #3047.

llvm-svn: 59131
parent 28897804
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