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cmake - msvc/openmp: clean&document configuration

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This commit is contained in:
Zdenko Podobný 2022-12-15 13:26:56 +01:00
parent f2f37a8323
commit f25196151b
1 changed files with 16 additions and 9 deletions
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25
CMakeLists.txt
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@ -299,13 +299,6 @@ if(OPENMP_BUILD
endif()
if(OPENMP_BUILD)
find_package(OpenMP QUIET)
if(OpenMP_FOUND)
message(">> OpenMP_FOUND ${OpenMP_FOUND} ${OpenMP_VERSION}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
if (NOT TARGET OpenMP::OpenMP_CXX)
add_library(OpenMP::OpenMP_CXX IMPORTED INTERFACE)
endif()
endif()
# https://stackoverflow.com/questions/12399422
# how-to-set-linker-flags-for-openmp-in-cmakes-try-compile-function
if(NOT OpenMP_FOUND
@ -326,8 +319,22 @@ if(OPENMP_BUILD)
add_definitions(-D_OPENMP=201107)
endif()
if(MSVC)
string(REPLACE "/openmp" "/openmp:llvm -openmp:experimental" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
string(REPLACE "-openmp" "/openmp:llvm -openmp:experimental" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
# Note: -openmp:llvm is available for X64 from MSVC 16.9
# from MSVC 16.10 Preview 2 there is support also for x86 and arm64
# https://devblogs.microsoft.com/cppblog/openmp-updates-and-fixes-for-cpp-in-visual-studio-2019-16-10/
if ("${OpenMP_CXX_FLAGS}" STREQUAL "-openmp")
set(OpenMP_CXX_FLAGS "-openmp:llvm")
endif()
# 'simd': requires '-openmp:experimental'
set_source_files_properties(src/arch/dotproduct.cpp
PROPERTIES COMPILE_FLAGS "-openmp:experimental")
endif()
if(OpenMP_FOUND)
message(">> OpenMP_FOUND ${OpenMP_FOUND} version: ${OpenMP_CXX_VERSION}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
if (NOT TARGET OpenMP::OpenMP_CXX)
add_library(OpenMP::OpenMP_CXX IMPORTED INTERFACE)
endif()
endif()
endif()