jwhowarth added a comment.

In https://reviews.llvm.org/D25932#581167, @mehdi_amini wrote:

> I just verified that I reproduce with -flto and an previous clang version.


This issue will only be triggered if you build with 
"-DCMAKE_INSTALL_PREFIX:PATH=/sw/opt/llvm-4.0" to place llvm in a buried 
subdirectory and access the compilers with symlinks in /sw/bin pointing at the 
actual compilers in /sw/opt/llvm-4.0/bin. The call to 
llvm::sys::path::parent_path(D.getInstalledDir()) incorrectly places the 
install level at /sw instead of the actual sw/opt/llvm-4.0.


Repository:
  rL LLVM

https://reviews.llvm.org/D25932



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