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#
# Copyright (C) 2005 Martin Decky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

## Make some default assumptions
#

ifndef ARCH
    ARCH = ia32
endif

## Common compiler flags
#

DEFS = -DARCH=$(ARCH)
CFLAGS = -fno-builtin -fomit-frame-pointer -Werror-implicit-function-declaration -Wmissing-prototypes -Werror -O3 -nostdlib -nostdinc -Ilibc/include
LFLAGS = -M
AFLAGS =

## Setup platform configuration
#

include libc/arch/$(ARCH)/Makefile.inc

## Toolchain configuration
#

ifeq ($(COMPILER),native)
    CC = gcc
    AS = as
    LD = ld
    OBJCOPY = objcopy
    OBJDUMP = objdump
else
    CC = $(TOOLCHAIN_DIR)/$(TARGET)-gcc
    AS = $(TOOLCHAIN_DIR)/$(TARGET)-as
    LD = $(TOOLCHAIN_DIR)/$(TARGET)-ld
    OBJCOPY = $(TOOLCHAIN_DIR)/$(TARGET)-objcopy
    OBJDUMP = $(TOOLCHAIN_DIR)/$(TARGET)-objdump
endif

.PHONY: all clean

all: init

clean:
    -rm -f init init.map _link.ld *.o
    $(MAKE) -C libc clean ARCH=$(ARCH)

libc/libc.a:
    $(MAKE) -C libc all ARCH=$(ARCH)

_link.ld: _link.ld.in
    $(CC) $(DEFS) $(CFLAGS) -E -x c $< | grep -v "^\#" > $@

init: init.o libc/libc.a _link.ld
    $(LD) -T _link.ld $(LFLAGS) init.o libc/libc.a -o $@ -Map init.map

%.o: %.S
    $(CC) $(DEFS) $(AFLAGS) $(CFLAGS) -D__ASM__ -c $< -o $@

%.o: %.s
    $(AS) $(AFLAGS) $< -o $@

%.o: %.c
    $(CC) $(DEFS) $(CFLAGS) -c $< -o $@