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#
# Encapsulates building Eigen3 as an External Project.
include(ITK_CheckCCompilerFlag)
set(_additional_external_project_args)
if(APPLE)
if(DEFINED CMAKE_APPLE_SILICON_PROCESSOR)
list(APPEND _additional_external_project_args
-DCMAKE_APPLE_SILICON_PROCESSOR:STRING=${CMAKE_APPLE_SILICON_PROCESSOR})
endif()
endif()
if(NOT CMAKE_CONFIGURATION_TYPES)
list(APPEND _additional_external_project_args -DCMAKE_BUILD_TYPE:STRING=Release)
endif()
if(CMAKE_SH AND CMAKE_VERSION VERSION_LESS "3.17.0")
# Setting CMAKE_SH is required when using "MinGW Makefiles" generator with CMake < 3.17
# See https://github.com/InsightSoftwareConsortium/ITK/issues/66#issuecomment-424374973
list(APPEND _additional_external_project_args -DCMAKE_SH:PATH=${CMAKE_SH})
endif()
# Because the header-only nature of Eigen3, EIGEN_MPL2_ONLY definition could be leaked outside ITK.
# This would wrongly enforce EIGEN_MPL2_ONLY to other libraries using Eigen.
# We wrap this definition in ITK_USE_EIGEN_MPL2_ONLY, and only enabling it internally in the dashboards and CI,
# to avoid introducing GPL code from Eigen3 internally in ITK.
option(ITK_USE_EIGEN_MPL2_ONLY "Set compile definition EIGEN_MPL2_ONLY for ITKInternalEigen3." OFF)
mark_as_advanced(ITK_USE_EIGEN_MPL2_ONLY)
if(ITK_USE_SYSTEM_EIGEN)
find_package(Eigen3)
else()
# Set variables used to configure and install Eigen
# _eigen3_cmake_install_prefix work also with relative CMAKE_INSTALL_PREFIX
get_filename_component(
_eigen3_cmake_install_prefix
${CMAKE_INSTALL_PREFIX}
ABSOLUTE
BASE_DIR
${PROJECT_BINARY_DIR})
set(_eigen3_cmake_install_includedir ${ITK_INSTALL_INCLUDE_DIR})
set(_eigen3_cmake_install_datadir ${ITK_INSTALL_PACKAGE_DIR}/Modules)
set(_eigen3_source_dir "${ITK_SOURCE_DIR}/Modules/ThirdParty/Eigen3/src/itkeigen")
set(_eigen3_build_dir "${ITK_BINARY_DIR}/ITKInternalEigen3-build")
# ExternalProject_add creates a target for the build tree,
# too late for our purposes of find_package at configure time.
# We execute the configuration manually to create the Config and Targets.cmake files.
# Nothing to link or compile, so no need to pass compiler flags.
# However, generators and c,cxx compilers have to be explicitly passed
# for CMake configuration to work.
# Configure Eigen
execute_process(
COMMAND
${CMAKE_COMMAND} -DCMAKE_SYSTEM_VERSION:STRING=${CMAKE_SYSTEM_VERSION} -DCMAKE_GENERATOR:STRING=${CMAKE_GENERATOR}
-DCMAKE_GENERATOR_TOOLSET:STRING=${CMAKE_GENERATOR_TOOLSET}
-DCMAKE_GENERATOR_PLATFORM:STRING=${CMAKE_GENERATOR_PLATFORM}
-DCMAKE_GENERATOR_INSTANCE:STRING=${CMAKE_GENERATOR_INSTANCE} -DCMAKE_C_COMPILER:PATH=${CMAKE_C_COMPILER}
-DCMAKE_C_FLAGS:STRING=${CMAKE_C_FLAGS} -DCMAKE_CXX_COMPILER:PATH=${CMAKE_CXX_COMPILER}
-DCMAKE_CXX_FLAGS:STRING=${CMAKE_CXX_FLAGS} -DCMAKE_OSX_ARCHITECTURES:STRING=${CMAKE_OSX_ARCHITECTURES}
-DCMAKE_INSTALL_PREFIX:PATH=${_eigen3_cmake_install_prefix}
-DCMAKE_INSTALL_INCLUDEDIR:PATH=${_eigen3_cmake_install_includedir}
-DCMAKE_INSTALL_DATADIR:PATH=${_eigen3_cmake_install_datadir}
-DITK_USE_EIGEN_MPL2_ONLY:BOOL=${ITK_USE_EIGEN_MPL2_ONLY} ${_additional_external_project_args} -S
${_eigen3_source_dir} -B ${_eigen3_build_dir}
OUTPUT_VARIABLE _ITKEigen3Config_OUTPUT
ERROR_VARIABLE _ITKEigen3Config_OUTPUT
RESULT_VARIABLE _ITKEigen3Config_RESULT
)
if(NOT _ITKEigen3Config_RESULT EQUAL 0)
string(REPLACE "\n" "\n " _ITKEigen3Config_OUTPUT "${_ITKEigen3Config_OUTPUT}")
message(FATAL_ERROR
"ITKInternalEigen3 configuration failed:\n"
" ${_ITKEigen3Config_OUTPUT}\n"
)
endif()
if(NOT EXISTS "${_eigen3_build_dir}/ITKInternalEigen3Config.cmake")
message(FATAL_ERROR
"ITKInternalEigen3 configuration did not produce expected file:\n"
" ${_eigen3_build_dir}/ITKInternalEigen3Config.cmake\n"
)
endif()
set(ITKInternalEigen3_DIR ${_eigen3_build_dir})
find_package(ITKInternalEigen3 CONFIG REQUIRED QUIET)
install(
CODE "execute_process(
COMMAND \${CMAKE_COMMAND} --build . --config Release --target install
WORKING_DIRECTORY \"${_eigen3_build_dir}\"
)"
COMPONENT Development)
endif()
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