Build with OpenMP on Windows
This commit is contained in:
Sebastian Messmer
parent
38397a2d86
commit
6042d4ba6b
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@ -9,76 +9,72 @@ target_compile_definitions(cryptopp PUBLIC $<$<CONFIG:Debug>:CRYPTOPP_DEBUG>) #
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add_compile_options($<$<CONFIG:Debug>:-DCRYPTOPP_DEBUG>) # add to stuff built in subdirectories (like the actual library)
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if(NOT DISABLE_OPENMP)
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if (MSVC)
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message(WARNING "MSVC does not support the OpenMP 4.0 standard used by Crypto++. Disabling OpenMP. This can cause degraded performance.")
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else()
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find_package(OpenMP)
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find_package(OpenMP)
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if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
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message(STATUS "Found libomp without any special flags")
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endif()
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# If OpenMP wasn't found, try if we can find it in the default Macports location
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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.
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set(OpenMP_CXX_FLAGS "-Xpreprocessor -fopenmp -I/opt/local/include/libomp/")
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set(OpenMP_CXX_LIB_NAMES omp)
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set(OpenMP_omp_LIBRARY /opt/local/lib/libomp/libomp.dylib)
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find_package(OpenMP)
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if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
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message(STATUS "Found libomp in macports default location.")
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else()
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message(FATAL_ERROR "Didn't find libomp. Tried macports default location but also didn't find it.")
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endif()
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endif()
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# If OpenMP wasn't found, try if we can find it in the default Homebrew location
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if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND) AND EXISTS "/usr/local/opt/libomp/lib/libomp.dylib")
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set(OpenMP_CXX_FLAGS "-Xpreprocessor -fopenmp -I/usr/local/opt/libomp/include")
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set(OpenMP_CXX_LIB_NAMES omp)
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set(OpenMP_omp_LIBRARY /usr/local/opt/libomp/lib/libomp.dylib)
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find_package(OpenMP)
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if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
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message(STATUS "Found libomp in homebrew default location.")
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else()
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message(FATAL_ERROR "Didn't find libomp. Tried homebrew default location but also didn't find it.")
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endif()
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endif()
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set(Additional_OpenMP_Libraries_Workaround "")
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# Workaround because older cmake on apple doesn't support FindOpenMP
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if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND))
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if((APPLE AND ((CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang") OR (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")))
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AND ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "7.0") AND (CMAKE_VERSION VERSION_LESS "3.12.0")))
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message(STATUS "Applying workaround for OSX OpenMP with old cmake that doesn't have FindOpenMP")
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set(OpenMP_CXX_FLAGS "-Xclang -fopenmp")
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set(Additional_OpenMP_Libraries_Workaround "-lomp")
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else()
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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.")
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endif()
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endif()
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if(NOT TARGET OpenMP::OpenMP_CXX)
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# We're on cmake < 3.9, handle behavior of the old FindOpenMP implementation
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message(STATUS "Applying workaround for old CMake that doesn't define FindOpenMP using targets")
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add_library(OpenMP_TARGET INTERFACE)
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add_library(OpenMP::OpenMP_CXX ALIAS OpenMP_TARGET)
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target_compile_options(OpenMP_TARGET INTERFACE ${OpenMP_CXX_FLAGS}) # add to all targets depending on this
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find_package(Threads REQUIRED)
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target_link_libraries(OpenMP_TARGET INTERFACE Threads::Threads)
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target_link_libraries(OpenMP_TARGET INTERFACE ${OpenMP_CXX_FLAGS} ${Additional_OpenMP_Libraries_Workaround})
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endif()
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target_link_libraries(cryptopp PUBLIC ${OpenMP_CXX_FLAGS}) # Workaround for Ubuntu 18.04 that otherwise doesn't set -fopenmp for linking
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target_link_libraries(cryptopp PUBLIC OpenMP::OpenMP_CXX)
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# also add these flags to the third party Crypto++ build setup that is built in a subdirectory
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message(STATUS "OpenMP flags: ${OpenMP_CXX_FLAGS}")
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string(REPLACE " " ";" REPLACED_FLAGS ${OpenMP_CXX_FLAGS})
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add_compile_options(${REPLACED_FLAGS})
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if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
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message(STATUS "Found libomp without any special flags")
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endif()
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# If OpenMP wasn't found, try if we can find it in the default Macports location
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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.
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set(OpenMP_CXX_FLAGS "-Xpreprocessor -fopenmp -I/opt/local/include/libomp/")
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set(OpenMP_CXX_LIB_NAMES omp)
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set(OpenMP_omp_LIBRARY /opt/local/lib/libomp/libomp.dylib)
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find_package(OpenMP)
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if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
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message(STATUS "Found libomp in macports default location.")
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else()
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message(FATAL_ERROR "Didn't find libomp. Tried macports default location but also didn't find it.")
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endif()
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endif()
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# If OpenMP wasn't found, try if we can find it in the default Homebrew location
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if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND) AND EXISTS "/usr/local/opt/libomp/lib/libomp.dylib")
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set(OpenMP_CXX_FLAGS "-Xpreprocessor -fopenmp -I/usr/local/opt/libomp/include")
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set(OpenMP_CXX_LIB_NAMES omp)
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set(OpenMP_omp_LIBRARY /usr/local/opt/libomp/lib/libomp.dylib)
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find_package(OpenMP)
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if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
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message(STATUS "Found libomp in homebrew default location.")
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else()
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message(FATAL_ERROR "Didn't find libomp. Tried homebrew default location but also didn't find it.")
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endif()
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endif()
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set(Additional_OpenMP_Libraries_Workaround "")
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# Workaround because older cmake on apple doesn't support FindOpenMP
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if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND))
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if((APPLE AND ((CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang") OR (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")))
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AND ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "7.0") AND (CMAKE_VERSION VERSION_LESS "3.12.0")))
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message(STATUS "Applying workaround for OSX OpenMP with old cmake that doesn't have FindOpenMP")
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set(OpenMP_CXX_FLAGS "-Xclang -fopenmp")
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set(Additional_OpenMP_Libraries_Workaround "-lomp")
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else()
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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.")
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endif()
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endif()
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if(NOT TARGET OpenMP::OpenMP_CXX)
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# We're on cmake < 3.9, handle behavior of the old FindOpenMP implementation
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message(STATUS "Applying workaround for old CMake that doesn't define FindOpenMP using targets")
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add_library(OpenMP_TARGET INTERFACE)
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add_library(OpenMP::OpenMP_CXX ALIAS OpenMP_TARGET)
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target_compile_options(OpenMP_TARGET INTERFACE ${OpenMP_CXX_FLAGS}) # add to all targets depending on this
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find_package(Threads REQUIRED)
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target_link_libraries(OpenMP_TARGET INTERFACE Threads::Threads)
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target_link_libraries(OpenMP_TARGET INTERFACE ${OpenMP_CXX_FLAGS} ${Additional_OpenMP_Libraries_Workaround})
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endif()
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target_link_libraries(cryptopp PUBLIC ${OpenMP_CXX_FLAGS}) # Workaround for Ubuntu 18.04 that otherwise doesn't set -fopenmp for linking
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target_link_libraries(cryptopp PUBLIC OpenMP::OpenMP_CXX)
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# also add these flags to the third party Crypto++ build setup that is built in a subdirectory
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message(STATUS "OpenMP flags: ${OpenMP_CXX_FLAGS}")
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string(REPLACE " " ";" REPLACED_FLAGS ${OpenMP_CXX_FLAGS})
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add_compile_options(${REPLACED_FLAGS})
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else()
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message(WARNING "OpenMP is disabled. This can cause degraded performance.")
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endif()
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