#####
##Top Makefile to build the Minix libraries for ack and gnu
#
##needed in makefile that includes this file:
#
##libraries to build without .a:
#LIBRARIES=liba libb libc
#
##object files per library:
#liba_OBJECTS=filea2.o filea2.o
#libb_OBJECTS=fileb.o
#libc_OBJECTS=filec.o
#
##if it has subdirectories
#SUBDIRS=subdir1 subdir2
#
#
##The main Makefile has to specify the ack and gnu base object directories:
#ACKBASE=/path/to/ack-obj
#GNUBASE=/path/to/gnu-obj
##or relative in this way: 
#ACKBASE=$(CURDIR)/ack-obj
#GNUBASE=$(CURDIR)/gnu-obj
#
##All these variables have to be set before including this Makefile
#
#
##To customize dependencies for targets you can do the following
#$(call ADDDEPENDENCIES,filea2.o fileb.o,header1.h header2.h)
#
##And to customize MAKE variables for targets use the same construct this way
#$(call ADDDEPENDENCIES,filea2.o fileb.o,CFLAGS+=-D_EXTRA_DEFINES -g)
#
##Only one variable can be set per call to ADDDEPENDENCIES
#

##Object files that must end up in the top level object directory must be in
##then variable named TOPLEVEL_OBJECTS


ifndef ACKBASE
$(error ACKBASE not set)
endif

.PHONY: all 
all:: \
	$(addsuffix .a,$(addprefix $(ACKBASE)/,$(LIBRARIES))) \
	$(addprefix $(ACKBASE)/,$(TOPLEVEL_OBJECTS)) \
	subdirs

.PHONY: clean
clean:: subdirs
	rm -fr $(ACKBASE)/$(OBJDIR)

#Start objects
define TOPLEVEL_template
$$(addprefix $$(ACKBASE)/,$(1)): $$(addprefix $$(ACKBASE)/$$(OBJDIR)/,$(1))
	cp $$? $$@
endef

$(foreach obj,$(TOPLEVEL_OBJECTS),$(eval $(call TOPLEVEL_template,$(obj))))

#Library stuff
define LIBRARY_template
$$(ACKBASE)/$(1).a: $$(addprefix $$(ACKBASE)/$$(OBJDIR)/,$$($(1)_OBJECTS))
	$$(AR) cr $$@ $$?
endef

$(foreach lib,$(LIBRARIES),$(eval $(call LIBRARY_template,$(lib))))

#subdirectories
.PHONY: subdirs $(SUBDIRS)
subdirs: $(SUBDIRS)
$(SUBDIRS):
	mkdir -p $(ACKBASE)/$(OBJDIR)/$@
	ACKBASE=$(ACKBASE) OBJDIR=$(OBJDIR)/$@ $(MAKE) -C $@ $(MAKECMDGOALS)

#Build commands
#define COMPILE_template
$(ACKBASE)/%: AR=ar
$(ACKBASE)/%: AS=cc -c
$(ACKBASE)/%: CC=cc
$(ACKBASE)/%: M2C=m2 -c

$(ACKBASE)/$(OBJDIR)/%.o: %.s
	$(COMPILE.s) -o $@ $<

$(ACKBASE)/$(OBJDIR)/%.o: %.c
	$(COMPILE.c) -o $@ $<

$(ACKBASE)/$(OBJDIR)/%.o: %.e
	$(COMPILE.c) -o $@ $<

$(ACKBASE)/$(OBJDIR)/%.o: %.mod
	$(COMPILE.mod) -o $@ $<
#endef

#$(eval $(call COMPILE_template,$$(ACKBASE),s,ar,cc -c,cc,m2))

#DEPENDENCIES
define DEPENDENCIES_template
$$(ACKBASE)/$$(OBJDIR)/$(1): $(2)
endef

define ADDDEPENDENCIES
$(foreach target,$(1),$(eval $(call DEPENDENCIES_template,$(target),$(2))))
endef