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Documentation: kunit: Add clang UML coverage example 

LLVM-based toolchain is using a different set of tools for coverage.
Add an example that produces output in lcov format.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: David Gow <davidgow@google.com>
[rw: Added spelling fixes from David Gow]
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Michał Winiarski 2023-10-20 11:21:59 +02:00 committed by Richard Weinberger
parent 32a84cfc6c
commit 21822553a5
1 changed files with 11 additions and 0 deletions
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Documentation/dev-tools/kunit/running_tips.rst
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@ -139,6 +139,17 @@ If your installed version of gcc doesn't work, you can tweak the steps:
$ ./tools/testing/kunit/kunit.py run --make_options=CC=/usr/bin/gcc-6
$ lcov -t "my_kunit_tests" -o coverage.info -c -d .kunit/ --gcov-tool=/usr/bin/gcov-6
Alternatively, LLVM-based toolchains can also be used:
.. code-block:: bash
# Build with LLVM and append coverage options to the current config
$ ./tools/testing/kunit/kunit.py run --make_options LLVM=1 --kunitconfig=.kunit/ --kunitconfig=tools/testing/kunit/configs/coverage_uml.config
$ llvm-profdata merge -sparse default.profraw -o default.profdata
$ llvm-cov export --format=lcov .kunit/vmlinux -instr-profile default.profdata > coverage.info
# The coverage.info file is in lcov-compatible format and it can be used to e.g. generate HTML report
$ genhtml -o /tmp/coverage_html coverage.info
Running tests manually
======================