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macro (vtk_set_with_default var value)
if (NOT ${var})
set(${var} "${value}")
endif ()
endmacro ()
# Bridge an old, deprecated, setting to a new replacement setting.
#
# Use this function when a user-visible flag is being renamed or otherwise
# replaced. If the old value is set, it will be given as the default value,
# otherwise the given default value will be used. This returned value should
# then be used in the ``set(CACHE)`` or ``option()`` call for the new value.
#
# If the old value is set, it will warn that it is deprecated for the new name.
#
# If replacing the setting ``OLD_SETTING`` with ``NEW_SETTING``, its usage
# would look like:
#
# vtk_deprecated_setting(default_setting NEW_SETTING OLD_SETTING "default value")
# set(NEW_SETTING "${default_setting}"
# CACHE STRING "Documentation for the setting.")
function (vtk_deprecated_setting output_default new old intended_default)
set(default "${intended_default}")
if (DEFINED "${old}")
message(WARNING "The '${old}' variable is deprecated for '${new}'.")
set(default "${${old}}")
endif ()
set("${output_default}" "${default}" PARENT_SCOPE)
endfunction ()
# Remove an old / obsolete setting
#
# Use this function when a user-visible flag is being removed entirely. If the
# old value is set, it will be cause a warning message letting the user know
# that the setting has no effect.
function (vtk_obsolete_setting old)
if (DEFINED "${old}")
message(WARNING "The '${old}' variable is obsolete and no longer has any effect.")
endif ()
endfunction ()
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