r351316 - Reapply [Tooling] Make clang-tool find libc++ dir on mac when running on a file without compilation database.

[Jeremy Morse via cfe-commits]

Hi Sam,

Unfortunately this trips up a variety of buildbots:

    http://lab.llvm.org:8011/builders/clang-hexagon-elf/builds/22376
    http://lab.llvm.org:8011/builders/clang-x64-ninja-win7/builds/15053
    http://lab.llvm.org:8011/builders/clang-hexagon-elf/builds/22376
    http://lab.llvm.org:8011/builders/clang-x64-windows-msvc/builds/3401
    http://lab.llvm.org:8011/builders/lldb-amd64-ninja-netbsd8/builds/18177

http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-windows10pro-fast/builds/22919

For the Windows machines at least, I don't believe lit can cope with
replicating shell subprocesses and thus the use of $(which...). (I could be
wrong there, but it matches up with the error messages).

"clang-check-mac-libcxx-fixed-compilation-db.cpp" sounds like it's
mac-specific, maybe only "REQUIRES: system-darwin" is needed?

--
Thanks,
Jeremy


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