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# file : build/m4/m4.make
# author : Boris Kolpackov <boris@codesynthesis.com>
# copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
# license : GNU GPL v2; see accompanying LICENSE file
$(out_base)/%: m4 := m4
$(out_base)/%: m4_options +=
ifeq ($(out_base),$(src_base))
$(out_base)/%: $(src_base)/%.m4
else
$(out_base)/%: $(src_base)/%.m4 | $$(dir $$@).
endif
$(call message,m4 $<,$(m4) $(m4_options) $< >$@)
ifneq ($(out_base),$(src_base))
$(out_base)/%: $(out_base)/%.m4 | $$(dir $$@).
$(call message,m4 $<,$(m4) $(m4_options) $< >$@)
endif
# @@
# This is where things start breaking. Following standard logic I should
# make a $(out_base)/%.clean rule, i.e., "will clean anything" rule. If
# this rule happened to be before some other, more specialized rule, and
# that rule happened to rm some additional stuff (like %.o tries to rm
# .d file, which is also not quite correct...). In other word there
# doesn't seem to be a way to properly match "build" and "clean" rules.
# One idea is to make the "clean" rule depend on what "build" rule
# depends (%.m4 in our case) hoping that this way the rule won't match.
#
# There are two problems with this approach:
#
# 1. It is if not iff. However, since the rules come in pairs and make
# pick the first implicit rule that matches, it is certain that if
# make picked this "clean" rule it also picked corresponding "build"
# rule.
#
# 2. The prerequisite (%.m4) can be an intermidiate file which itself
# may not exist. We don't want make to build it just to clean it
# or, even worse, to leave it laying around. I guess the only way
# to work around this is to provide special do-nothing rules during
# cleanup.
#
#
.PHONY: $(out_base)/%.m4.clean
$(out_base)/%.m4.clean:
$(call message,rm $(@:.m4.clean=),rm -f $(@:.m4.clean=))
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