libcryfs/vendor/cryptopp/CMakeLists.txt

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CMake
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project(mycryptopp)
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add_library(cryptopp dummy.cpp)
# note: include directory is called vendor_cryptopp instead of cryptopp to avoid include clashes with system headers
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target_include_directories(cryptopp SYSTEM INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
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if (CMAKE_BUILD_TYPE STREQUAL "Debug")
target_compile_definitions(cryptopp PUBLIC -DCRYPTOPP_DEBUG)
endif()
if(NOT DISABLE_OPENMP)
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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")))
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# Workaround because older cmake on apple doesn't support FindOpenMP
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message(STATUS "Applying workaround for OSX OpenMP")
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set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-Xclang -fopenmp")
target_link_libraries(cryptopp PRIVATE -lomp)
else()
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message(STATUS "Using OpenMP")
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find_package(OpenMP)
if(OPENMP_FOUND)
set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS})
target_link_libraries(cryptopp PRIVATE ${OpenMP_CXX_FLAGS})
else(OPENMP_FOUND)
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(OPENMP_FOUND)
endif()
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else(NOT DISABLE_OPENMP)
message(WARNING "OpenMP is disabled. This can cause degraded performance.")
endif(NOT DISABLE_OPENMP)
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set(BUILD_TESTING OFF)
set(BUILD_DOCUMENTATION OFF)
set(BUILD_SHARED OFF)
set(BUILD_STATIC ON)
add_subdirectory(vendor_cryptopp EXCLUDE_FROM_ALL)
target_link_libraries(cryptopp PRIVATE cryptopp-static)