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OSX: If OpenMP is installed with homebrew or macports, auto-detect its setup

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This commit is contained in:
Sebastian Messmer 2018-10-15 18:02:52 +02:00
parent 41c7051b1f
commit 08ed966808
1 changed files with 36 additions and 4 deletions
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40
vendor/cryptopp/CMakeLists.txt vendored
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@ -14,18 +14,50 @@ if(NOT DISABLE_OPENMP)
else() else()
find_package(OpenMP) find_package(OpenMP)
if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND)) # older cmake uses OPENMP_FOUND, newer cmake also sets OPENMP_CXX_FOUND, homebrew installations seem only to get the latter set. if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
message(STATUS "Found libomp without any special flags")
endif()
# If OpenMP wasn't found, try if we can find it in the default Macports location
if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND) AND EXISTS "/opt/local/lib/libomp/libomp.dylib") # older cmake uses OPENMP_FOUND, newer cmake also sets OPENMP_CXX_FOUND, homebrew installations seem only to get the latter set.
set(OpenMP_CXX_FLAGS "-Xpreprocessor -fopenmp -I/opt/local/include/libomp/")
set(OpenMP_CXX_LIB_NAMES omp)
set(OpenMP_omp_LIBRARY /opt/local/lib/libomp/libomp.dylib)
find_package(OpenMP)
if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
message(STATUS "Found libomp in macports default location.")
else()
message(FATAL_ERROR "Didn't find libomp. Tried macports default location but also didn't find it.")
endif()
endif()
# If OpenMP wasn't found, try if we can find it in the default Homebrew location
if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND) AND EXISTS "/usr/local/opt/libomp/lib/libomp.dylib")
set(OpenMP_CXX_FLAGS "-Xpreprocessor -fopenmp -I/usr/local/opt/libomp/include")
set(OpenMP_CXX_LIB_NAMES omp)
set(OpenMP_omp_LIBRARY /usr/local/opt/libomp/lib/libomp.dylib)
find_package(OpenMP)
if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
message(STATUS "Found libomp in homebrew default location.")
else()
message(FATAL_ERROR "Didn't find libomp. Tried homebrew default location but also didn't find it.")
endif()
endif()
set(Additional_OpenMP_Libraries_Workaround "")
# Workaround because older cmake on apple doesn't support FindOpenMP
if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND))
if((APPLE AND ((CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang") OR (CMAKE_CXX_COMPILER_ID STREQUAL "Clang"))) if((APPLE AND ((CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang") OR (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")))
AND ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "7.0") AND (CMAKE_VERSION VERSION_LESS "3.12.0"))) AND ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "7.0") AND (CMAKE_VERSION VERSION_LESS "3.12.0")))
# Workaround because older cmake on apple doesn't support FindOpenMP
message(STATUS "Applying workaround for OSX OpenMP with old cmake that doesn't have FindOpenMP") message(STATUS "Applying workaround for OSX OpenMP with old cmake that doesn't have FindOpenMP")
set(OpenMP_CXX_FLAGS "-Xclang -fopenmp") set(OpenMP_CXX_FLAGS "-Xclang -fopenmp")
set(Additional_OpenMP_Libraries_Workaround "-lomp") set(Additional_OpenMP_Libraries_Workaround "-lomp")
else() else()
message(FATAL_ERROR "Did not find OpenMP. Build with -DDISABLE_OPENMP=ON if you want to allow this and are willing to take the performance hit.") message(FATAL_ERROR "Did not find OpenMP. Build with -DDISABLE_OPENMP=ON if you want to allow this and are willing to take the performance hit.")
endif() endif()
else()
set(Additional_OpenMP_Libraries_Workaround "")
endif() endif()
if(NOT TARGET OpenMP::OpenMP_CXX) if(NOT TARGET OpenMP::OpenMP_CXX)