#
# This makefile system follows the structuring conventions
# recommended by Peter Miller in his excellent paper:
#
#	Recursive Make Considered Harmful
#	http://aegis.sourceforge.net/auug97.pdf
#
OBJDIR := obj

TOP = .

# try to infer the correct GCCPREFIX
ifndef GCCPREFIX
GCCPREFIX := $(shell if objdump -i 2>&1 | grep 'elf32-i386' >/dev/null 2>&1; \
	then echo ''; \
	else echo "***" 1>&2; \
	echo "*** Error: Couldn't find an i386-*-elf version of GCC/binutils." 1>&2; \
	echo "*** Is the directory with i386-*-elf-gcc in your PATH?" 1>&2; \
	echo "***" 1>&2; exit 1; fi)
endif

CC	:= $(GCCPREFIX)gcc -pipe
GCC_LIB := $(shell $(CC) -print-libgcc-file-name)
AS	:= $(GCCPREFIX)as
AR	:= $(GCCPREFIX)ar
LD	:= $(GCCPREFIX)ld
OBJCOPY	:= $(GCCPREFIX)objcopy
OBJDUMP	:= $(GCCPREFIX)objdump
NM	:= $(GCCPREFIX)nm

# Native commands
NCC	:= gcc $(CC_VER) -pipe
TAR	:= gtar

# Compiler flags
# -fno-builtin is required to avoid refs to undefined functions in the kernel.
# Only optimize to -O1 to discourage inlining, which complicates backtraces.
CFLAGS	:= $(CFLAGS) $(DEFS) $(LABDEFS) -O -fno-builtin -I$(TOP) -MD -Wall -Wno-format -Wno-unused -Werror -gstabs -fno-stack-protector -std=gnu99 -m32 -nostdlib

# Lists that the */Makefrag makefile fragments will add to
OBJDIRS :=

# Make sure that 'all' is the first target
all:

# Eliminate default suffix rules
.SUFFIXES:

# Delete target files if there is an error (or make is interrupted)
.DELETE_ON_ERROR:

# make it so that no intermediate .o files are ever deleted
.PRECIOUS: %.o $(OBJDIR)/boot/%.o $(OBJDIR)/kern/%.o \
	$(OBJDIR)/lib/%.o $(OBJDIR)/fs/%.o $(OBJDIR)/user/%.o

KERN_CFLAGS := $(CFLAGS) -DARCANOS_KERNEL -gstabs
USER_CFLAGS := $(CFLAGS) -I usr/inc -DARCANOS_USER -gstabs

# Include Makefrags for subdirectories
include kern/Makefrag
include usr/lib/Makefrag
include usr/app/Makefrag

IMAGES = $(OBJDIR)/kern/bochs.img

# For deleting the build
clean:
	rm -rf $(OBJDIR)

# Auto-copy to boot disk image
load: all
	mkdir -p mnt
	./tools/copy_to_image.sh

EMULATOR=bochs
run: all
	$(EMULATOR) -q

always:
	@:

.PHONY: all always \
	clean