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2152ae985c
When using lit's internal shell, RUN lines like the following accidentally execute an external `diff` instead of lit's internal `diff`: ``` # RUN: program | diff file - # RUN: not diff file1 file2 | FileCheck %s ``` Such cases exist now, in `clang/test/Analysis` for example. We are preparing patches to ensure lit's internal `diff` is called in such cases, which will then fail because lit's internal `diff` cannot currently be used in pipelines and doesn't recognize `-` as a command-line option. To enable pipelines, this patch moves lit's `diff` implementation into an out-of-process script, similar to lit's `cat` implementation. A follow-up patch will implement `-` to mean stdin. Reviewed By: probinson, stella.stamenova Differential Revision: https://reviews.llvm.org/D66574 llvm-svn: 372035
===============================
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