45 lines
1.8 KiB
ReStructuredText
45 lines
1.8 KiB
ReStructuredText
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.. _libcudacxx-setup-building:
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Building & Testing libcu++
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==========================
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libcu++ can be build and tested as shown in our `contributor guidelines <https://github.com/NVIDIA/cccl/blob/main/CONTRIBUTING.md#building-and-testing>`_.
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However, often only a small subset of the full test suite needs to be run during development. For that we rely on ``lit``.
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After libcu++ has been configured either through the build scripts or directly via a cmake preset one can then run.
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.. code:: bash
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cd build
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lit libcudacxx/RELATIVE_PATH_TO_TEST_OR_SUBFOLDER -sv
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This will build and run all tests within ``RELATIVE_PATH_TO_TEST_OR_SUBFOLDER`` which must be a valid path within the CCCL.
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Note that the name of the top level folder is the same as the name of the preset. For the build script the default is
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``libcudacxx``. As an example this is how to run all tests for ``cuda::std::span``, which are located in
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``libcudacxx/test/libcudacxx/std/containers/views/views.span``
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.. code:: bash
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cd build
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# Builds all tests within libcudacxx/test/libcudacxx/std/containers/views/views.span
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lit libcudacxx/libcudacxx/test/libcudacxx/std/containers/views/views.span -sv
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# Builds the individual test array.pass.cpp
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lit libcudacxx/libcudacxx/test/libcudacxx/std/containers/views/views.span/span.cons/array.pass.cpp -sv
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If only building the tests and not running them is desired one can pass ``-Dexecutor="NoopExecutor()"`` to the lit invocation.
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This is especially useful if the machine has no GPU or testing a different architecture
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.. code:: bash
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cd build
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lit libcudacxx/RELATIVE_PATH_TO_TEST_OR_SUBFOLDER -sv -Dexecutor="NoopExecutor()"
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Finally different standard modes can be tested by passing e.g ``--param=std=c++20``
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.. code:: bash
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cd build
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lit libcudacxx/RELATIVE_PATH_TO_TEST_OR_SUBFOLDER -sv --param=std=c++20
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