#
# Makefile
#
# Copyright (C) 2016 Aleksandar Andrejevic <theflash@sdf.lonestar.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

DEBUG = yes

# Compilers and tools
CC = i686-elf-gcc
ASM = nasm
AR = i686-elf-ar

# Directories
SRCDIR = src
OBJDIR = obj
DEPDIR = dep

# Flags
CFLAGS = -Wall -Werror -ffreestanding -nostdlib -fPIC -I ..
ASMFLAGS = -felf

ifeq ($(DEBUG), yes)
    CFLAGS += -g
else
    CFLAGS += -O3
endif

# Input and output files
SOURCES =  $(wildcard $(SRCDIR)/*.c)
SOURCES += $(wildcard $(SRCDIR)/*.asm)

DEPENDS = $(shell find $(DEPDIR) -type f -name \*.d)
OBJECTS = $(patsubst $(SRCDIR)/%.c, $(OBJDIR)/%.o, $(patsubst $(SRCDIR)/%.asm, $(OBJDIR)/%.o, $(SOURCES)))

.PHONY: all clean

all: $(WRAPPERS) $(OBJDIR) $(DEPDIR) libmlsys.a

-include $(DEPENDS)

$(OBJDIR):
	mkdir -p $(OBJDIR)

$(DEPDIR):
	mkdir -p $(DEPDIR)

$(OBJDIR)/%.o: $(SRCDIR)/%.c Makefile
	mkdir -p $(dir $@)
	mkdir -p $(dir $(@:$(OBJDIR)/%.o=$(DEPDIR)/%.d))
	$(CC) $(CFLAGS) -MMD -MP -MF $(@:$(OBJDIR)/%.o=$(DEPDIR)/%.d) -o $@ -c $<

$(OBJDIR)/%.o: $(SRCDIR)/%.asm Makefile
	$(ASM) $(ASMFLAGS) -o $@ $<

libmlsys.a: $(OBJECTS)
	$(AR) rcs $@ $^

clean:
	rm -f libmlsys.a
	find $(OBJDIR) -name \*.o -delete
	find $(DEPDIR) -name \*.d -delete