libcryfs/vendor/cryptopp/CMakeLists.txt
2018-10-01 01:31:08 -07:00

62 lines
3.3 KiB
CMake

project(mycryptopp)
add_library(cryptopp dummy.cpp)
# note: include directory is called vendor_cryptopp instead of cryptopp to avoid include clashes with system headers
target_include_directories(cryptopp SYSTEM INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
# Forward debug build info (i.e. set CRYPTOPP_DEBUG variable if building in debug mode)
target_compile_definitions(cryptopp PUBLIC $<$<CONFIG:Debug>:CRYPTOPP_DEBUG>) # add to all targets depending on this
add_compile_options($<$<CONFIG:Debug>:-DCRYPTOPP_DEBUG>) # add to stuff built in subdirectories (like the actual library)
if(NOT DISABLE_OPENMP)
if (MSVC)
message(WARNING "MSVC does not support the OpenMP 4.0 standard used by Crypto++. Disabling OpenMP. This can cause degraded performance.")
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((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)
# We're on cmake < 3.9, handle behavior of the old FindOpenMP implementation
message(STATUS "Applying workaround for old CMake that doesn't define FindOpenMP using targets")
add_library(OpenMP_TARGET INTERFACE)
add_library(OpenMP::OpenMP_CXX ALIAS OpenMP_TARGET)
target_compile_options(OpenMP_TARGET INTERFACE ${OpenMP_CXX_FLAGS}) # add to all targets depending on this
find_package(Threads REQUIRED)
target_link_libraries(OpenMP_TARGET INTERFACE Threads::Threads)
target_link_libraries(OpenMP_TARGET INTERFACE ${OpenMP_CXX_FLAGS} ${Additional_OpenMP_Libraries_Workaround})
endif()
target_link_libraries(cryptopp PUBLIC ${OpenMP_CXX_FLAGS}) # Workaround for Ubuntu 18.04 that otherwise doesn't set -fopenmp for linking
target_link_libraries(cryptopp PUBLIC OpenMP::OpenMP_CXX)
# also add these flags to the third party Crypto++ build setup that is built in a subdirectory
message(STATUS "OpenMP flags: ${OpenMP_CXX_FLAGS}")
string(REPLACE " " ";" REPLACED_FLAGS ${OpenMP_CXX_FLAGS})
add_compile_options(${REPLACED_FLAGS})
endif()
else()
message(WARNING "OpenMP is disabled. This can cause degraded performance.")
endif()
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)