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Fix OpenMP on MacOS #126

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Fix OpenMP on MacOS #126

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1f8ee93
Fix OpenMP on MacOS
smessmer Oct 2, 2024
2b871d1
Update CMakeLists.txt
smessmer Oct 2, 2024
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53 changes: 52 additions & 1 deletion cryptopp/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -1433,7 +1433,58 @@ if(CRYPTOPP_USE_OPENMP)
list(APPEND CMAKE_PREFIX_PATH /opt/homebrew/opt/libomp/)
list(APPEND CMAKE_PREFIX_PATH /opt/local/lib/libomp/)
list(APPEND CMAKE_INCLUDE_PATH /opt/local/include/libomp/)
find_package(OpenMP REQUIRED)

find_package(OpenMP)

if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
message(STATUS "OpenMP: 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 "OpenMP: Found libomp in macports default location.")
else()
message(FATAL_ERROR "OpenMP: 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 (Intel Macs)
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 "OpenMP: Found libomp in homebrew default location for Intel Macs.")
else()
message(FATAL_ERROR "OpenMP: Didn't find libomp. Tried homebrew default location for Intel Macs but also didn't find it.")
endif()
endif()

# If OpenMP wasn't found, try if we can find it in the default Homebrew location (Apple Silicon Macs)
if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND) AND EXISTS "/opt/homebrew/opt/libomp/lib/libomp.dylib")
set(OpenMP_CXX_FLAGS "-Xpreprocessor -fopenmp -I/opt/homebrew/opt/libomp/include")
set(OpenMP_CXX_LIB_NAMES omp)
set(OpenMP_omp_LIBRARY /opt/homebrew/opt/libomp/lib/libomp.dylib)

find_package(OpenMP)
if (OPENMP_FOUND OR OPENMP_CXX_FOUND)
message(STATUS "OpenMP: Found libomp in homebrew default location for Apple Silicon Macs.")
else()
message(FATAL_ERROR "OpenMP: Didn't find libomp. Tried homebrew default location for Apple Silicon Macs but also didn't find it.")
endif()
endif()

if((NOT OPENMP_FOUND) AND (NOT OPENMP_CXX_FOUND))
message(FATAL_ERROR "OpenMP: Didn't find libomp.\nFind output:\n${outVar}")
endif()
endif()

target_link_libraries(
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