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ENH: Support building with system Eigen3 >= 5 #5590

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Merged
phcerdan merged 1 commit into from
Nov 4, 2025
Merged

ENH: Support building with system Eigen3 >= 5 #5590

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17 changes: 13 additions & 4 deletions Modules/ThirdParty/Eigen3/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -52,16 +52,19 @@ set(_Eigen3_min_version 3.3)

if(ITK_USE_SYSTEM_EIGEN)
set(_Eigen3_SYSTEM_OR_INTERNAL "Eigen3")
find_package(${_Eigen3_SYSTEM_OR_INTERNAL} ${_Eigen3_min_version} REQUIRED CONFIG)
find_package(${_Eigen3_SYSTEM_OR_INTERNAL} REQUIRED CONFIG)
set(Eigen3_DIR_INSTALL ${Eigen3_DIR})
set(Eigen3_DIR_BUILD ${Eigen3_DIR})
else()
set(_Eigen3_SYSTEM_OR_INTERNAL "ITKInternalEigen3")
find_package(${_Eigen3_SYSTEM_OR_INTERNAL} ${_Eigen3_min_version} REQUIRED CONFIG)
find_package(${_Eigen3_SYSTEM_OR_INTERNAL} REQUIRED CONFIG)
set(Eigen3_DIR_INSTALL "\${ITK_MODULES_DIR}")
set(_eigen3_build_dir "${ITK_BINARY_DIR}/ITKInternalEigen3-build")
set(Eigen3_DIR_BUILD "${_eigen3_build_dir}")
endif()
if(${_Eigen3_SYSTEM_OR_INTERNAL}_VERSION VERSION_LESS ${_Eigen3_min_version})
message(FATAL_ERROR "Eigen3 version ${_Eigen3_min_version} or later is required.")
endif()

# Eigen3 is header only, but there are compile definitions that we want to provide
# to enforce use of MPL only code, and to disable warnings.
Expand All @@ -77,12 +80,18 @@ set(ITKEigen3_INCLUDE_DIRS
set(ITKEigen3_EXPORT_CODE_INSTALL "
set(ITK_USE_SYSTEM_EIGEN \"${ITK_USE_SYSTEM_EIGEN}\")
set(${_Eigen3_SYSTEM_OR_INTERNAL}_DIR \"${Eigen3_DIR_INSTALL}\")
find_package(${_Eigen3_SYSTEM_OR_INTERNAL} ${_Eigen3_min_version} REQUIRED CONFIG)
find_package(${_Eigen3_SYSTEM_OR_INTERNAL} REQUIRED CONFIG)
if(${_Eigen3_SYSTEM_OR_INTERNAL}_VERSION VERSION_LESS ${_Eigen3_min_version})
message(FATAL_ERROR \"Eigen3 version ${_Eigen3_min_version} or later is required.\")
endif()
")
set(ITKEigen3_EXPORT_CODE_BUILD "
set(ITK_USE_SYSTEM_EIGEN \"${ITK_USE_SYSTEM_EIGEN}\")
set(${_Eigen3_SYSTEM_OR_INTERNAL}_DIR \"${Eigen3_DIR_BUILD}\")
find_package(${_Eigen3_SYSTEM_OR_INTERNAL} ${_Eigen3_min_version} REQUIRED CONFIG)
find_package(${_Eigen3_SYSTEM_OR_INTERNAL} REQUIRED CONFIG)
if(${_Eigen3_SYSTEM_OR_INTERNAL}_VERSION VERSION_LESS ${_Eigen3_min_version})
message(FATAL_ERROR \"Eigen3 version ${_Eigen3_min_version} or later is required.\")
endif()
")

# Eigen3 targets are not installed if ITK_USE_SYSTEM_EIGEN==True
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