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# Copyright (C) 2016-2017 Luke Shumaker
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
mod.var.description = Depend on the values of variables
define mod.var.doc
# Inputs:
# (user-defined)
# Outputs:
# Target : `$(outdir)/.var.%`
# Directory variable: `at.targets`
# Directory variable: `var.`
#
# It's a well-known secret that many files generated by a Makefile vary with
# the values of particular variables, but that GNU Make can't track these
# dependencies. Well, with some cleverness, it actually can!
#
# With this module, to depend on the value of a variable, depend on
# `$(outdir)/.var.VARNAME`, or `$(var.)VARNAME` for short.
endef
mod.var.doc := $(value mod.var.doc)
var. = $(patsubst ./%,%,$(outdir)/.var.)
.PHONY: _var.FORCE
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