Petr Hosek 8f90efe346 [Driver] Do a PATH lookup if needed when using -no-canonical-prefixes ...

When -no-canonical-prefixes option is used and argv0 contains only
a program name, we need to do a PATH lookup to get an executable path,
otherwise the return value won't be a valid path and any subsequent
uses of it (e.g. when invoking -cc1) will fail with an error.

This patch fixes PR9576.

Differential Revision: https://reviews.llvm.org/D34290

llvm-svn: 305600

2017-06-16 22:40:18 +00:00

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