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Fix CMake OpenMP flag checks with CL #2497

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Fix CMake OpenMP flag checks with CL #2497

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22 changes: 19 additions & 3 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,7 @@ endforeach()

include(CMakePackageConfigHelpers)
include(CheckCXXCompilerFlag)
include(CheckCXXSourceCompiles)
include(CheckIncludeFileCXX)
include(GNUInstallDirs)

Expand Down Expand Up @@ -153,9 +154,24 @@ string(TOLOWER ${ONEDPL_BACKEND} ONEDPL_BACKEND)
if (ONEDPL_ENABLE_SIMD)
if (NOT INTEL_LLVM_COMPILER OR NOT INTEL_LLVM_COMPILER_VERSION VERSION_LESS 2021.4)
foreach(_simd_flag -fopenmp-simd /Qopenmp-simd -qopenmp-simd -openmp-simd)
string(MAKE_C_IDENTIFIER ${_simd_flag} FLAG_DISPLAY_NAME)
check_cxx_compiler_flag(${_simd_flag} ${FLAG_DISPLAY_NAME}_option)
if (${FLAG_DISPLAY_NAME}_option)
string(MAKE_C_IDENTIFIER ${_simd_flag} FLAG_VAR_NAME) # make a string suitable for a cmake variable name

# Compile a trivial OpenMP program to check if the flag is supported
# Save and restore CMAKE_REQUIRED_FLAGS to avoid side effects
set(_saved_flags ${CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_FLAGS ${_simd_flag})
check_cxx_source_compiles(
"#include <omp.h>
int main() {
#pragma omp simd
for (int i = 0; i < 4; ++i) {}
return 0;
}"
IS_${FLAG_VAR_NAME}_AVAILABLE
)
set(CMAKE_REQUIRED_FLAGS ${_saved_flags})

if (IS_${FLAG_VAR_NAME}_AVAILABLE)
target_compile_options(oneDPL INTERFACE ${_simd_flag})
set(_simd_enabled_flag ${_simd_flag})
break()
Expand Down