Be more careful about paths to look for llvm

AcademySoftwareFoundation / OpenShadingLanguage

Advanced shading language for production GI renderers

BSD 3-Clause "New" or "Revised" License

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Be more careful about paths to look for llvm #1656

Closed lgritz closed 1 year ago

lgritz commented 1 year ago

In particular, ${LLVM_ROOT}/bin will end up being (incorrectly!) /bin if LLVM_ROOT is empty. That is bad if some other llvm-config happens to be in /bin.