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# Copyright 2020 Eduard F Valeyev
# Distributed under the OSI-approved BSD 3-Clause License.
# See https://opensource.org/licenses/BSD-3-Clause for details.
#
# add_custom_target_subproject(proj X ...) defines custom target X-proj and
# - if target X already exists, makes it depend on X-proj
# - else creates target X depending on X-proj
#
# use case: if custom target names (e.g. "check", "doc", etc.) clash
# with other project's target when used as a subproject
#
# example: add_custom_target_subproject(myproject check USES_TERMINAL COMMAND ${CMAKE_CTEST_COMMAND} -V)
#
macro(add_custom_target_subproject _subproj _name)
set(extra_args "${ARGN}")
add_custom_target(${_name}-${_subproj} ${extra_args})
# does the newly-created target compiled by default?
list(FIND extra_args "ALL" extra_args_has_all)
if (NOT (extra_args_has_all EQUAL -1))
set (target_built_by_default ON)
endif()
if (TARGET ${_name})
# is existing target ${_name} also compiled by default?
# warn if not, but this project's target is since that
# may indicate inconsistent creation of generic targets
get_target_property(supertarget_not_built_by_default ${_name} EXCLUDE_FROM_ALL)
if (target_built_by_default AND supertarget_not_built_by_default)
message(WARNING "Created target ${_name}-${_subproj} is built by default but \"super\"-target ${_name} is not; perhaps it should be?")
endif()
add_dependencies(${_name} ${_name}-${_subproj})
else (TARGET ${_name})
# use ALL if given
if (target_built_by_default)
add_custom_target(${_name} ALL DEPENDS ${_name}-${_subproj})
else (target_built_by_default)
add_custom_target(${_name} DEPENDS ${_name}-${_subproj})
endif(target_built_by_default)
endif (TARGET ${_name})
endmacro()
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