/usr/lib/cmake/ITK-4.12/ITKModuleAPI.cmake is in libinsighttoolkit4-dev 4.12.2-dfsg1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Private helper macros.
macro(_itk_module_use_recurse mod)
if(NOT ${dep}_USED)
set(${mod}_USED 1)
itk_module_load("${mod}")
foreach(dep IN LISTS ${mod}_TRANSITIVE_DEPENDS)
_itk_module_use_recurse(${dep})
endforeach()
if(${mod}_INCLUDE_DIRS)
include_directories(${${mod}_INCLUDE_DIRS})
endif()
if(${mod}_LIBRARY_DIRS)
link_directories(${${mod}_LIBRARY_DIRS})
endif()
endif()
endmacro()
macro(_itk_module_config_recurse ns mod)
if(NOT _${ns}_${mod}_USED)
set(_${ns}_${mod}_USED 1)
list(APPEND _${ns}_USED_MODULES ${mod})
itk_module_load("${mod}")
list(APPEND ${ns}_LIBRARIES ${${mod}_LIBRARIES})
list(APPEND ${ns}_INCLUDE_DIRS ${${mod}_INCLUDE_DIRS})
list(APPEND ${ns}_LIBRARY_DIRS ${${mod}_LIBRARY_DIRS})
list(APPEND ${ns}_RUNTIME_LIBRARY_DIRS ${${mod}_RUNTIME_LIBRARY_DIRS})
foreach(dep IN LISTS ${mod}_TRANSITIVE_DEPENDS)
_itk_module_config_recurse("${ns}" "${dep}")
endforeach()
endif()
endmacro()
#-----------------------------------------------------------------------------
# Public interface macros.
# itk_module_load(<module>)
#
# Loads variables describing the given module:
# <module>_LOADED = True if the module has been loaded
# <module>_DEPENDS = List of dependencies on other modules (public link, private link, compile)
# <module>_PUBLIC_DEPENDS = List of dependencies on other modules (public link)
# <module>_TRANSITIVE_DEPENDS = List of dependencies on other modules (public link, compile)
# <module>_PRIVATE_DEPENDS = List of dependencies on other modules (private link)
# <module>_LIBRARIES = Libraries to link
# <module>_INCLUDE_DIRS = Header search path
# <module>_LIBRARY_DIRS = Library search path (for outside dependencies)
# <module>_RUNTIME_LIBRARY_DIRS = Runtime linker search path
macro(itk_module_load mod)
if(NOT ${mod}_LOADED)
include("${ITK_MODULES_DIR}/${mod}.cmake" OPTIONAL)
if(NOT ${mod}_LOADED)
message(FATAL_ERROR "No such module: \"${mod}\"")
endif()
# Include the targets file if it has been defined. Targets files other
# than ITKTargets.cmake are created when modules are built externally. Do not
# include the targets file inside the module itself -- which occurs in a module's
# test configuration.
if(EXISTS "${${mod}_TARGETS_FILE}" AND NOT itk-module STREQUAL mod)
include("${${mod}_TARGETS_FILE}")
endif()
endif()
endmacro()
# itk_module_config(<namespace> [modules...])
#
# Configures variables describing the given modules and their dependencies:
# <namespace>_LIBRARIES = Libraries to link
# <namespace>_INCLUDE_DIRS = Header search path
# <namespace>_LIBRARY_DIRS = Library search path (for outside dependencies)
# <namespace>_RUNTIME_LIBRARY_DIRS = Runtime linker search path
# Do not name a module as the namespace.
macro(itk_module_config ns)
set(${ns}_LIBRARIES "")
set(${ns}_INCLUDE_DIRS "")
set(${ns}_LIBRARY_DIRS "")
set(${ns}_RUNTIME_LIBRARY_DIRS "")
set(_${ns}_USED_MODULES "")
foreach(mod ${ARGN})
_itk_module_config_recurse("${ns}" "${mod}")
endforeach()
foreach(mod ${_${ns}_USED_MODULES})
unset(_${ns}_${mod}_USED)
endforeach()
unset(_${ns}_USED_MODULES)
foreach(v ${ns}_LIBRARIES ${ns}_INCLUDE_DIRS ${ns}_LIBRARY_DIRS
${ns}_RUNTIME_LIBRARY_DIRS)
if(${v})
list(REMOVE_DUPLICATES ${v})
endif()
endforeach()
endmacro()
# itk_module_use([modules...])
#
# Adds include directories and link directories for the given modules and
# their dependencies.
macro(itk_module_use)
foreach(mod ${ARGN})
_itk_module_use_recurse("${mod}")
endforeach()
endmacro()
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