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macro(_parse_arguments_with_multi_hack ORIGINAL_COMMAND_LINE)
# cmake_parse_arguments() put all the MULTIS in a single variable; you
# lose the ability to see for example multiple COMMANDs. To be able to
# passthrough multiple MULTIS, we add a marker after every MULTI. This
# allows us to reassemble the correct amount again before giving it to
# the wrapped command with _reassemble_command_line().
set(COMMAND_LINE "${ORIGINAL_COMMAND_LINE}")
foreach(MULTI IN LISTS MULTIS)
string(REPLACE "${MULTI}" "${MULTI};:::" COMMAND_LINE "${COMMAND_LINE}")
endforeach()
cmake_parse_arguments(PARAM "${OPTIONS}" "${SINGLES}" "${MULTIS}" ${COMMAND_LINE})
endmacro()
macro(_reassemble_command_line)
# Reassemble the command line as we original got it.
set(NEW_COMMAND_LINE ${PARAM_UNPARSED_ARGUMENTS})
foreach(OPTION IN LISTS OPTIONS)
if(PARAM_${OPTION})
list(APPEND NEW_COMMAND_LINE "${OPTION}")
endif()
endforeach()
foreach(SINGLE IN LISTS SINGLES)
if(PARAM_${SINGLE})
list(APPEND NEW_COMMAND_LINE "${SINGLE}" "${PARAM_${SINGLE}}")
endif()
endforeach()
foreach(MULTI IN LISTS MULTIS)
if(PARAM_${MULTI})
# Replace our special marker with the name of the MULTI again. This
# restores for example multiple COMMANDs again.
string(REPLACE ":::" "${MULTI}" PARAM_${MULTI} "${PARAM_${MULTI}}")
list(APPEND NEW_COMMAND_LINE "${PARAM_${MULTI}}")
endif()
endforeach()
endmacro()
# Generated files can be older than their dependencies, causing useless
# regenerations. This function replaces each file in OUTPUT with a .timestamp
# file, adds a command to touch it and move the original file in BYPRODUCTS,
# before calling add_custom_command().
#
# Note: Any add_custom_target() depending on files in original OUTPUT must use
# add_custom_target_timestamp() instead to have the correct dependencies.
#
# add_custom_command_timestamp(OUTPUT output1 [output2 ...]
# COMMAND command1 [ARGS] [args1...]
# [COMMAND command2 [ARGS] [args2...] ...]
# [MAIN_DEPENDENCY depend]
# [DEPENDS [depends...]]
# [BYPRODUCTS [files...]]
# [IMPLICIT_DEPENDS <lang1> depend1
# [<lang2> depend2] ...]
# [WORKING_DIRECTORY dir]
# [COMMENT comment]
# [VERBATIM] [APPEND] [USES_TERMINAL])
function(add_custom_command_timestamp)
set(OPTIONS VERBATIM APPEND USES_TERMINAL)
set(SINGLES MAIN_DEPENDENCY WORKING_DIRECTORY COMMENT)
set(MULTIS OUTPUT COMMAND DEPENDS BYPRODUCTS IMPLICIT_DEPENDS)
_parse_arguments_with_multi_hack("${ARGN}")
# Create a list of all the OUTPUTs (by removing our magic marker)
string(REPLACE ":::;" "" OUTPUTS "${PARAM_OUTPUT}")
# Reset the OUTPUT and BYPRODUCTS as an empty list (if needed).
# Because they are MULTIS, we need to add our special marker here.
set(PARAM_OUTPUT ":::")
if(NOT PARAM_BYPRODUCTS)
set(PARAM_BYPRODUCTS ":::")
endif()
foreach(OUTPUT IN LISTS OUTPUTS)
# For every output, we add a 'cmake -E touch' entry to update the
# timestamp on each run.
get_filename_component(OUTPUT_FILENAME ${OUTPUT} NAME)
string(APPEND PARAM_COMMAND ";:::;${CMAKE_COMMAND};-E;touch;${CMAKE_CURRENT_BINARY_DIR}/${OUTPUT_FILENAME}.timestamp")
# We change the OUTPUT to a '.timestamp' variant, and make the real
# output a byproduct.
list(APPEND PARAM_OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${OUTPUT_FILENAME}.timestamp)
list(APPEND PARAM_BYPRODUCTS ${OUTPUT})
# Mark this file as being a byproduct; we use this again with
# add_custom_target_timestamp() to know if we should point to the
# '.timestamp' variant or not.
set_source_files_properties(${OUTPUT} PROPERTIES BYPRODUCT ${CMAKE_CURRENT_BINARY_DIR}/${OUTPUT_FILENAME}.timestamp)
endforeach()
# Reassemble and call the wrapped command
_reassemble_command_line()
add_custom_command(${NEW_COMMAND_LINE})
endfunction()
# Generated files can be older than their dependencies, causing useless
# regenerations. This function adds a .timestamp file for each file in DEPENDS
# replaced by add_custom_command_timestamp(), before calling add_custom_target().
#
# add_custom_target_timestamp(Name [ALL] [command1 [args1...]]
# [COMMAND command2 [args2...] ...]
# [DEPENDS depend depend depend ... ]
# [BYPRODUCTS [files...]]
# [WORKING_DIRECTORY dir]
# [COMMENT comment]
# [VERBATIM] [USES_TERMINAL]
# [SOURCES src1 [src2...]])
function(add_custom_target_timestamp)
set(OPTIONS VERBATIM USES_TERMINAL)
set(SINGLES WORKING_DIRECTORY COMMENT)
set(MULTIS COMMAND DEPENDS BYPRODUCTS SOURCES)
# ALL is missing, as the order is important here. It will be picked up
# by ${PARAM_UNPARSED_ARGUMENTS} when reassembling the command line.
_parse_arguments_with_multi_hack("${ARGN}")
# Create a list of all the DEPENDs (by removing our magic marker)
string(REPLACE ":::;" "" DEPENDS "${PARAM_DEPENDS}")
# Reset the DEPEND as an empty list.
# Because it is a MULTI, we need to add our special marker here.
set(PARAM_DEPENDS ":::")
foreach(DEPEND IN LISTS DEPENDS)
# Check if the output is produced by add_custom_command_timestamp()
get_source_file_property(BYPRODUCT ${DEPEND} BYPRODUCT)
if(BYPRODUCT STREQUAL "NOTFOUND")
# If it is not, just keep it as DEPEND
list(APPEND PARAM_DEPENDS "${DEPEND}")
else()
# If it is, the BYPRODUCT property points to the timestamp we want to depend on
list(APPEND PARAM_DEPENDS "${BYPRODUCT}")
endif()
endforeach()
# Reassemble and call the wrapped command
_reassemble_command_line()
add_custom_target(${NEW_COMMAND_LINE})
endfunction()
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