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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()
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")))
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")
set(OpenMP_CXX_FLAGS "-Xclang -fopenmp")
set(Additional_OpenMP_Libraries_Workaround "-lomp")
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.")
endif()
else()
set(Additional_OpenMP_Libraries_Workaround "")
endif()
if(NOT TARGET OpenMP::OpenMP_CXX)