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Debugging LIT scripts can be rather painful, as LIT directly does not specify which line has failed. Rather, FileCheck is expected to report the failing location, but it can be often ambiguous if multiple commands are tested against the same prefix. This change adds a -vv option, which echoes all output. Then detecting the error becomes straightforward: last printed line is the failing one. Of course, it could be desired to try to get failing line number directly from bash, but it involves excessive hacks on older bash versions (cf. https://stackoverflow.com/questions/24398691/how-to-get-the-real-line-number-of-a-failing-bash-command) Differential Revision: https://reviews.llvm.org/D35330 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307938 91177308-0d34-0410-b5e6-96231b3b80d8
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lit - A Software Testing Tool
===============================
lit is a portable tool for executing LLVM and Clang style test suites,
summarizing their results, and providing indication of failures. lit is designed
to be a lightweight testing tool with as simple a user interface as possible.
=====================
Contributing to lit
=====================
Please browse the Test Suite > lit category in LLVM's Bugzilla for ideas on
what to work on.
Before submitting patches, run the test suite to ensure nothing has regressed:
# From within your LLVM source directory.
utils/lit/lit.py \
--path /path/to/your/llvm/build/bin \
utils/lit/tests
Note that lit's tests depend on 'not' and 'FileCheck', LLVM utilities.
You will need to have built LLVM tools in order to run lit's test suite
successfully.
You'll also want to confirm that lit continues to work when testing LLVM.
Follow the instructions in http://llvm.org/docs/TestingGuide.html to run the
regression test suite:
make check-llvm
And be sure to run the llvm-lit wrapper script as well:
/path/to/your/llvm/build/bin/llvm-lit utils/lit/tests
Finally, make sure lit works when installed via setuptools:
python utils/lit/setup.py install
lit --path /path/to/your/llvm/build/bin utils/lit/tests