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testingparametersllvm

LLVM LIT: Is it possible to pass user defined parameter into a test script?

Do somebody know how to parametrize a llvm-lit script? I need to pass some environment variable value into a script to use it inside command line of some tool.

For example, test script could have the following line:

// RUN: some-tool $SOME_ENV_VAR

I need to pass SOME_ENV_VAR value somehow.

According to the documentation for llvm-lit there is an option -D or --param, but is is unclear how to access this user defined parameter inside a script.

Thank you in advance.

Solution

  • If you're able to modify the lit.cfg script (or the script used to generate the config), you can use all the flexibility of Python in there. For example, you can add:

    some_var = os.environ.get('SOME_ENV_VAR', '')

    Then you can add find-replace tuples:

    config.substitutions.append(('%some_var', some_var))

    Now whenever you have %some_var appear in a RUN line, lit will substitute the value of the environment variable as it was when your test suite began.