# Copyright (c) 2021 B. Atticus Grobe (grobe0ba@gmail.com)
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

AFLAGS ?=
CFLAGS ?= 
CFLAGS += -Iinclude
LDFLAGS ?=
PREFIX ?= /usr

LDFLAGS += '-Wl,-rpath,$$ORIGIN/lib'

LIBRARIES = libhw
PROGRAMS = example

libhw_OBJS = src/hw/hw.c.o
libhw_LIBS =

example_OBJS = src/example/example.c.o
example_LIBS = libhw.a

AS = nasm
CC = clang
CXX = clang++
LD = clang++

.PHONY: all install clean

all: $(LIBRARIES:=.a) $(PROGRAMS)

depfiles = $($(LIBRARIES)_OBJS:.o=.d) $($(PROGRAMS)_OBJS:.o=.d)
libmkfiles = $(LIBRARIES:=.mk)
promkfiles = $(PROGRAMS:=.mk)

include $(depfiles)
include $(libmkfiles)
include $(promkfiles)

$(depfiles):
	touch $@

$(libmkfiles):
	echo '$(@:.mk=.a): $$($(@:.mk=)_OBJS) $$($(@:.mk=)_LIBS)' > $@
	echo '	$$(AR) crs $$@ $$($(@:.mk=)_OBJS) $$($(@:.mk=)_LIBS)' >> $@
	echo >> $@
	echo '$(@:.mk=)-clean:' >> $@
	echo '	rm -rf $(@:.mk=.a) $$($(@:.mk=)_OBJS) $$($(@:.mk=)_OBJS:.lo=.d) $$($(@:.mk=)_OBJS:.o=.d)' >> $@

$(promkfiles):
	echo '$(@:.mk=): $$($(@:.mk=)_OBJS) $$($(@:.mk=)_LIBS)' > $@
	echo '	$$(LD) $$(LDFLAGS) -o $$@ $$($(@:.mk=)_OBJS) $$($(@:.mk=)_LIBS)' >> $@
	echo >> $@
	echo '$(@:.mk=)-clean:' >> $@
	echo '	rm -rf $(@:.mk=) $$($(@:.mk=)_OBJS) $$($(@:.mk=)_OBJS:.lo=.d) $$($(@:.mk=)_OBJS:.o=.d)' >> $@

%.S.o: %.S
	$(AS) -MT $@ -MD -MP -MF $<.d -g -F dwarf -f elf64 -o $@ $<

%.c.o: %.c
	$(CC) $(CFLAGS) -MT $@ -MMD -MP -MF $<.d -c -o $@ $<

%.cc.o: %.cc
	$(CXX) $(CFLAGS) -MT $@ -MMD -MP -MF $<.d -c -o $@ $<

install: $(PROGRAMS) $(LIBRARIES:=.a)
	install -d -m755 $(PREFIX)/bin
	install -d -m755 $(PREFIX)/lib
	libtool --mode=install install -m644 $(LIBRARIES:=.a) $(PREFIX)/lib
	libtool --mode=install install -m755 $(PROGRAMS) $(PREFIX)/bin
	libtool --finish $(PREFIX)/lib

clean:
	$(MAKE) $(PROGRAMS:=-clean) $(LIBRARIES:=-clean)
	rm -rf $(libmkfiles)
	rm -rf $(promkfiles)
	rm -rf *.mk