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include(ExternalProject)
ExternalProject_Add(once
DOWNLOAD_COMMAND ""
CONFIGURE_COMMAND "${CMAKE_COMMAND}" -P ${CMAKE_CURRENT_BINARY_DIR}/once-configure.cmake
BUILD_COMMAND "${CMAKE_COMMAND}" -P ${CMAKE_CURRENT_BINARY_DIR}/once-build.cmake
INSTALL_COMMAND "${CMAKE_COMMAND}" -P ${CMAKE_CURRENT_BINARY_DIR}/once-install.cmake
)
ExternalProject_Add(always
DEPENDS once
DOWNLOAD_COMMAND ""
CONFIGURE_COMMAND "${CMAKE_COMMAND}" -P ${CMAKE_CURRENT_BINARY_DIR}/always-configure.cmake
BUILD_COMMAND "${CMAKE_COMMAND}" -P ${CMAKE_CURRENT_BINARY_DIR}/always-build.cmake
COMMAND "${CMAKE_COMMAND}" -E copy_if_different ${CMAKE_CURRENT_LIST_FILE}
"${CMAKE_CURRENT_BINARY_DIR}/byproduct.txt"
BUILD_BYPRODUCTS "${CMAKE_CURRENT_BINARY_DIR}/byproduct.txt"
BUILD_ALWAYS 1
INSTALL_COMMAND "${CMAKE_COMMAND}" -P ${CMAKE_CURRENT_BINARY_DIR}/always-install.cmake
)
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