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include(ExternalProject)
ExternalProject_Add(proj0
SOURCE_DIR "."
DOWNLOAD_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj0-download-mark
CONFIGURE_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj0-configure-mark
BUILD_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj0-build-mark
INSTALL_COMMAND ""
)
cmake_policy(GET CMP0114 cmp0114)
if(cmp0114 STREQUAL "NEW")
set(step_targets "update;test")
set(independent_step_targets "")
else()
set(step_targets "install;test")
set(independent_step_targets "download;update")
endif()
ExternalProject_Add(proj1
DEPENDS proj0
SOURCE_DIR "."
DOWNLOAD_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj1-download-mark
UPDATE_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj1-update-mark
PATCH_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj1-patch-mark
CONFIGURE_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj1-configure-mark
BUILD_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj1-build-mark
INSTALL_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj1-install-mark
TEST_COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/proj1-test-mark
TEST_EXCLUDE_FROM_MAIN 1 # Along with 'STEP_TARGETS test', implies 'STEP_TARGETS install'
UPDATE_DISCONNECTED 1 # Along with 'STEP_TARGETS update', implies 'STEP_TARGETS download'
STEP_TARGETS ${step_targets}
INDEPENDENT_STEP_TARGETS ${independent_step_targets}
)
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