# -*- makefile -*-

# sort out sources, objects and dependencies
SRCS :=
OBJS :=

# see http://www.gnu.org/software/make/manual/html_chapter/make_8.html#SEC91
# eval-function

$(foreach ARCHIVE, $(ARCHIVES), \
	$(eval SRCS += $($(subst .,_,$(subst -,_,$(ARCHIVE)))_SRCS)) \
	$(eval $(subst .,_,$(subst -,_,$(ARCHIVE)))_OBJS := \
		$(addsuffix .o, $(basename $($(subst .,_,$(subst -,_,$(ARCHIVE)))_SRCS)))) \
	$(eval OBJS += $($(subst .,_,$(subst -,_,$(ARCHIVE)))_OBJS)) \
)

$(foreach LARCHIVE, $(LARCHIVES), \
	$(eval SRCS += $($(subst .,_,$(subst -,_,$(LARCHIVE)))_SRCS)) \
	$(eval $(subst .,_,$(subst -,_,$(LARCHIVE)))_OBJS := \
		$(addsuffix .lo, $(basename $($(subst .,_,$(subst -,_,$(LARCHIVE)))_SRCS)))) \
	$(eval OBJS += $($(subst .,_,$(subst -,_,$(LARCHIVE)))_OBJS)) \
)

$(foreach PROGRAM, $(PROGRAMS), \
	$(eval SRCS += $($(subst .,_,$(subst -,_,$(PROGRAM))_SRCS))) \
	$(eval $(subst .,_,$(subst -,_,$(PROGRAM)))_OBJS := \
		$(addsuffix .o, $(basename $($(subst .,_,$(subst -,_,$(PROGRAM)))_SRCS)))) \
	$(eval OBJS += $($(subst .,_,$(subst -,_,$(PROGRAM)))_OBJS)) \
)

$(foreach LIBRARY, $(LIBRARIES), \
	$(eval SRCS += $($(subst .,_,$(subst -,_,$(LIBRARY)))_SRCS)) \
	$(eval $(subst .,_,$(subst -,_,$(LIBRARY)))_OBJS := \
		$(addsuffix .lo, $(basename $($(subst .,_,$(subst -,_,$(LIBRARY)))_SRCS)))) \
	$(eval OBJS += $($(subst .,_,$(subst -,_,$(LIBRARY)))_OBJS)) \
)

DEPS = $(addsuffix .d, $(basename $(SRCS)))

# beautify output
ifneq ($(VERBOSE),1)
Q = @
endif

# sub-directory traversal
.PHONY: subdirs $(subdirs)

subdirs: $(subdirs)
$(subdirs):
	$(Q)$(MAKE) --no-print-directory -C $@ $(MAKECMDGOALS)

# compilation
.SUFFIXES: .o .lo .a .al .so .d
.PRECIOUS: %.o %.lo

all: subdirs $(OBJS) $(ARCHIVES) $(LARCHIVES) $(LIBRARIES) $(PROGRAMS)

doc: subdirs

# objects
define mkdep
	@echo '  DEP  $@'
	$(Q)$(CC) -MM $(1) $< > $@.$$$$; \
		sed -e 's,\($*\)\.o[ :]*,\1.o $@ : ,g' \
            -e 's,$(shell basename $@),$@,g' < $@.$$$$ > $(subst .c,.d,$<); \
		rm -f $@.$$$$
endef

define compile
	@echo '  CC   $@'
	$(Q)$(CC) $(1) -c -o $@ $<
endef

%.o: %.c
	$(call mkdep,$(CPPFLAGS) $(INCLUDES) $(DEFS))
	$(call compile,$(CFLAGS) $(DEFS) $(INCLUDES))

%.lo: %.c
	$(call mkdep,$(CPPFLAGS) $(INCLUDES) $(DEFS))
	$(call compile,$(CFLAGS) $(DEFS) $(INCLUDES) $(PICFLAGS))

#############################################################################
# linking

# archives
define link-archive
	@echo '  AR   $@'
	$(Q)$(AR) -cru $@ $^
endef

# libraries
# the -Xlinker -rpath mangling is needed to find those libraries during
# linking for other objects
define link-library
	@echo '  LINK $@'
	$(Q)$(CC) -shared $(LDFLAGS) $(patsubst -L%, -Xlinker -rpath %, $(filter -L%, $(LIBS))) \
		 -o $@ $^ $(LIBS)
endef

# programs
define link-program
	@echo '  LINK $@'
	$(Q)$(CC) $(LDFLAGS) -o $@ $^ $(LIBS) $(1)
endef

# cleanup
.PHONY: clean
clean: subdirs
	$(Q)$(RM) -v $(OBJS) $(DEPS) $(PROGRAMS) $(CLEANFILES)
	$(Q)list="$(LIBRARIES) $(LARCHIVES) $(ARCHIVES)"; for each in $$list; do \
		$(RM) -v $$each*; \
	done

.PHONY: distclean
distclean: clean subdirs
	$(Q)$(RM) -v $(wildcard *~) core $(DISTCLEAN_FILES)