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Merge pull request #44854 from ClickHouse/comment-cpu-features

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Document usage of check_cxx_source_compiles instead of check_cxx_source_runs
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Robert Schulze 2023-01-03 09:48:38 +01:00 committed by GitHub
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cmake/cpu_features.cmake
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@ -102,6 +102,11 @@ elseif (ARCH_AMD64)
SET(ENABLE_AVX512_FOR_SPEC_OP 0)
endif()
# ClickHouse can be cross-compiled (e.g. on an ARM host for x86) but it is also possible to build ClickHouse on x86 w/o AVX for x86 w/
# AVX. We only check that the compiler can emit certain SIMD instructions, we don't care if the host system is able to run the binary.
# Therefore, use check_cxx_source_compiles (= does the code compile+link?) instead of check_cxx_source_runs (= does the code
# compile+link+run).
set (TEST_FLAG "-mssse3")
set (CMAKE_REQUIRED_FLAGS "${TEST_FLAG} -O0")
check_cxx_source_compiles("