Makefile.lib

comma:=,
MAKEVARS:=.makevars

define BUILD_d_file
.%.d: %.$(1) $(MAKEVARS)/$(2) $(MAKEVARS)/CPPFLAGS $(MAKEVARS)/$(2)FLAGS
	@set -e; trap 'rm -f $$@.$$$$$$$$' EXIT; rm -f $$@; \
	 $($(2)) -MM $$(CPPFLAGS) $($(2)FLAGS) $$< > $$@.$$$$$$$$; \
	 sed 's,\($$(notdir $$*)\)\.o[ :]*,$$*.o $@ : ,g' < $$@.$$$$$$$$ > $$@
endef

$(eval $(call BUILD_d_file,cc,CXX))
$(eval $(call BUILD_d_file,cpp,CXX))
$(eval $(call BUILD_d_file,C,CXX))
$(eval $(call BUILD_d_file,c,CC))
$(eval $(call BUILD_d_file,S,CC))

$(MAKEVARS):
	@mkdir -p $@

$(MAKEVARS)/%.tmp: $(MAKEVARS) FORCE
	@echo $(call $*) > $@

$(MAKEVARS)/%: $(MAKEVARS)/%.tmp
	@cmp -s $< $@ || cp -f $< $@
	@rm $<

override CPPFLAGS += $(patsubst %,-I%, $(DIRS))
SRC :=
TOOLS :=

include $(patsubst %, %/Makefrag, $(DIRS))

LIBOBJS := $(foreach src,$(SRC),$(basename $(src)).o)

define BUILD_tool
$(1)_OBJS := $$(if $$($(1)_SRC),$$(foreach obj,$$($(1)_SRC),$$(basename $$(obj)).o),$(1).o)
OBJECTS += $$($(1)_OBJS)
$(1): override CPPFLAGS+=$$($(1)_CPPFLAGS)
$(1): override CXXFLAGS+=$$($(1)_CXXFLAGS)
$(1): override LDFLAGS+=$$($(1)_LDFLAGS)
$(1): $$(LIBOBJS) $$($(1)_OBJS) $$(MAKEVARS)/LDFLAGS
	$$(CXX) -o $$@ $$(LDFLAGS) $$(filter %.o,$$^) $$(LDLIBS)
endef
$(foreach tool,$(TOOLS),$(eval $(call BUILD_tool,$(tool))))

OBJECTS := $(LIBOBJS) $(foreach tool,$(TOOLS),$(call $(tool)_OBJS))
DEPFILES := $(foreach obj,$(OBJECTS),$(dir $(obj)).$(notdir $(obj:.o=)).d)

all: $(TOOLS) $(DEPFILES) $(EXTRA_TARGETS)

clean:
	rm -rf $(TOOLS) $(OBJECTS) $(DEPFILES) $(EXTRA_CLEAN)

$(OBJECTS): $(MAKEVARS)/CXX $(MAKEVARS)/CXXFLAGS

-include $(DEPFILES)

.PHONY: FORCE
.PRECIOUS: $(MAKEVARS)/%
.DEFAULT_GOAL := all