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add_custom_command(
OUTPUT
${CMAKE_CURRENT_BINARY_DIR}/generated.h
COMMAND
${CMAKE_COMMAND} -E
copy ${CMAKE_CURRENT_SOURCE_DIR}/generated.h.in
${CMAKE_CURRENT_BINARY_DIR}/generated.h
CODEGEN
)
# This target should not be built. It has no reason
# to be part of the codegen build graph
add_custom_target(error_custom_target ALL
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/generated.h
# Cause the build to fail
COMMAND ${CMAKE_COMMAND} -E false
)