[llvm-dev] No longer able to run lit tests within a sub-tool

[Vedant Kumar via llvm-dev]

As of r313998, this workflow no longer works:

  cd <build-dir>
  ./bin/llvm-lit <src>/llvm/tools/clang/test/CoverageMapping

I get:

llvm-lit: /Users/vk/src/llvm.org-coverage-braces/llvm/tools/clang/test/lit.cfg.py:97: note: using clang: '/Volumes/Builds/llvm.org-coverage-braces-RA/bin/clang'
llvm-lit: /Users/vk/src/llvm.org-coverage-braces/llvm/utils/lit/lit/TestingConfig.py:101: fatal: unable to parse config file '/Users/vk/src/llvm.org-coverage-braces/llvm/tools/clang/test/lit.cfg.py', traceback: Traceback (most recent call last):
  File "/Users/vk/src/llvm.org-coverage-braces/llvm/utils/lit/lit/TestingConfig.py", line 88, in load_from_path
    exec(compile(data, path, 'exec'), cfg_globals, None)
  File "/Users/vk/src/llvm.org-coverage-braces/llvm/tools/clang/test/lit.cfg.py", line 128, in <module>
    config.substitutions.append( ('%clang_func_map', ' ' + lit.util.which('clang-func-mapping', config.environment['PATH']) + ' ') )
TypeError: cannot concatenate 'str' and 'NoneType' objects

However, this still works when running tests within llvm:

  ./bin/llvm-lit <src>/llvm/test/tools/llvm-cov

I'd appreciate any help in getting this working again.

thanks,
vedant

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