95a2eb70cf
Summary: The GPU runs these tests using the files built from the `libc` project. These will be placed in `include/<triple>` and `lib/<triple>`. We use the `amdhsa-loader` and `nvptx-loader` tools, which are also provided by `libc`. These launch a kernel called `_start` which calls `main` so we can pretend like GPU programs are normal terminal applications. We force serial exeuction here, because `llvm-lit` runs way too many processes in parallel, which has a bad habit of making the GPU drivers hang or run out of resources. This allows the compilation to be run in parallel while the jobs themselves are serialized via a file lock. In the future this can likely be refined to accept user specified architectures, or better handle including the root directory by exposing that instead of just `include/<triple>/c++/v1/`. This currently fails ~1% of the tests on AMDGPU and ~3% of the tests on NVPTX. This will hopefully be reduced further, and later patches can XFAIL a lot of them once it's down to a reasonable number. Future support will likely want to allow passing in a custom architecture instead of simply relying on `-mcpu=native`.
30 lines
912 B
INI
30 lines
912 B
INI
lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
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config.substitutions.append(('%{flags}',
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f'--target={config.target_triple} -Wno-multi-gpu -flto -mcpu=native'))
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config.substitutions.append(('%{compile_flags}',
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'-nogpulib -fno-builtin-printf -I %{include-dir} '
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'-I %{target-include-dir} -I %{libcxx-dir}/test/support'
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))
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config.substitutions.append(('%{link_flags}',
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'-nostdlib++ -startfiles -stdlib '
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'-Wl,-mllvm,-amdgpu-lower-global-ctor-dtor=0 '
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'-L %{lib-dir} -lc++ -lc++abi -lclang_rt.builtins'
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))
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config.substitutions.append(('%{exec}',
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'%{executor}'
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))
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config.stdlib = 'llvm-libc++'
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import os, site
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site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
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import libcxx.test.params, libcxx.test.config
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libcxx.test.config.configure(
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libcxx.test.params.DEFAULT_PARAMETERS,
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libcxx.test.features.DEFAULT_FEATURES,
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config,
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lit_config
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)
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