# figure out a few things about the host build system
ifeq ($(HOSTTYPE),)
	HOSTTYPE := $(shell uname -m)
endif
ifeq ($(OSTYPE),)
	OSTYPE := $(shell uname -s | awk -F_ '{print $$1}' | tr A-Z a-z)
endif
ifeq ($(HOSTTYPE),i586)
	HOSTTYPE := i386
endif
ifeq ($(HOSTTYPE),i686)
	HOSTTYPE := i386
endif
ifeq ($(HOSTTYPE), )
	HOSTTYPE := i386
endif
ifeq ($(findstring Macintosh,$(HOSTTYPE)),Macintosh)
	HOSTTYPE := ppc
endif
ifeq ($(HOSTTYPE),macintosh)
	ifeq ($(MACHTYPE),powerpc)
		HOSTTYPE := ppc
	endif
endif

# default platform and arch
ifeq ($(PLATFORM),)
	ifeq ($(ARCH),)
		#	by default, build for a i386-pc
		ARCH := i386
		PLATFORM := pc
	endif
endif

# some platforms only support one arch
ifeq ($(PLATFORM),pegasos)
ARCH := ppc
endif
ifeq ($(PLATFORM),mac)
ARCH := ppc
endif
ifeq ($(PLATFORM),xbox)
ARCH := i386
endif
ifeq ($(PLATFORM),dreamcast)
ARCH := sh4
endif

# some arches only support one platform
ifeq ($(ARCH),x86_64)
PLATFORM := pc
endif
ifeq ($(ARCH),sh4)
PLATFORM := dreamcast
endif

# build the TARGET variable
TARGET := $(ARCH)-$(PLATFORM)

# HOST_* is for local targets (tools)
HOST_CC := gcc
HOST_LD := $(LD)
HOST_AS := $(AS)
HOST_AR := $(AR)
HOST_OBJCOPY := objcopy
HOST_OBJDUMP := objdump
HOST_STRIP := strip
HOST_SIZE := size

# setup some local commands
ECHO := echo
AWK := awk
ifeq ($(OSTYPE),SunOS)
	ECHO := /usr/ucb/echo
	AWK := gawk
endif
ifeq ($(findstring solaris,$(OSTYPE)),solaris)
	ECHO := /usr/ucb/echo
	AWK := gawk
endif

# TOOLCHAIN_ARCH is usually ARCH, except in a few cases
TOOLCHAIN_ARCH := $(ARCH)
ifeq ($(ARCH),sh4)
TOOLCHAIN_ARCH := sh
endif

# try to detect if the user has ARCH-newos-gcc installed
#
#  NOTE:
#	the "| cat" below looks unnecesary, this is
#	to avoid a bug in liberty in certain versions
#	of gmake for BeOS
CC :=
FOO := $(shell $(TOOLCHAIN_ARCH)-newos-gcc --version | cat)
ifneq ($(FOO),)
$(warning found newos toolchain!)
	CC = $(TOOLCHAIN_ARCH)-newos-gcc
	LD = $(TOOLCHAIN_ARCH)-newos-ld
	AS = $(TOOLCHAIN_ARCH)-newos-as
	AR = $(TOOLCHAIN_ARCH)-newos-ar
	OBJCOPY = $(TOOLCHAIN_ARCH)-newos-objcopy
	OBJDUMP = $(TOOLCHAIN_ARCH)-newos-objdump
	STRIP = $(TOOLCHAIN_ARCH)-newos-strip
	SIZE = $(TOOLCHAIN_ARCH)-newos-size
endif 

FOO := $(shell $(TOOLCHAIN_ARCH)-elf-gcc --version | cat)
ifneq ($(FOO),)
$(warning WARNING: custom newos toolchain not found!)
$(warning falling back to elf toolchain)
	CC = $(TOOLCHAIN_ARCH)-elf-gcc
	LD = $(TOOLCHAIN_ARCH)-elf-ld
	AS = $(TOOLCHAIN_ARCH)-elf-as
	AR = $(TOOLCHAIN_ARCH)-elf-ar
	OBJCOPY = $(TOOLCHAIN_ARCH)-elf-objcopy
	OBJDUMP = $(TOOLCHAIN_ARCH)-elf-objdump
	STRIP = $(TOOLCHAIN_ARCH)-elf-strip
	SIZE = $(TOOLCHAIN_ARCH)-elf-size
endif
ifeq ($(CC),)
$(warning WARNING: custom newos toolchain not found!)
$(warning This build will probably fail miserably)
$(warning Download the appropriate toolchain for your build environment)
$(warning at http://newos.sourceforge.net/download.php)
	CC = $(HOST_CC)
	LD = $(HOST_LD)
	AS = $(HOST_AS)
	AR = $(HOST_AR)
	OBJCOPY = $(HOST_OBJCOPY)
	OBJDUMP = $(HOST_OBJDUMP)
	STRIP = $(HOST_STRIP)
	SIZE = $(HOST_SIZE)
endif

# set up some particular options for various architectures
ifeq ($(ARCH),i386)
	GLOBAL_CFLAGS = -O2 -g
	KERNEL_CFLAGS = -fno-pic
	USER_CFLAGS = -fpic
	GLOBAL_LDFLAGS = -g
endif

ifeq ($(ARCH),x86_64)
	GLOBAL_CFLAGS = -O2 -g 
	KERNEL_CFLAGS = -fno-pic -mcmodel=kernel
	USER_CFLAGS = -fpic
	GLOBAL_LDFLAGS = -g -m elf_x86_64
endif

ifeq ($(ARCH),ppc)
	GLOBAL_CFLAGS = -fno-pic -O -D__PPC__ -mregnames
	GLOBAL_LDFLAGS =
endif

ifeq ($(ARCH),ppc64)
	GLOBAL_CFLAGS =
	GLOBAL_LDFLAGS =
endif

ifeq ($(ARCH),arm)
	GLOBAL_CFLAGS = -O2 -g
	KERNEL_CFLAGS = -fno-pic
	USER_CFLAGS = -fpic
	GLOBAL_LDFLAGS =
endif

ifeq ($(ARCH),sh4)
	GLOBAL_CFLAGS = -ml -m4-single-only -mhitachi -O2 -g -D__SH4__
	KERNEL_CFLAGS = -fno-pic
	USER_CFLAGS = -fpic
	GLOBAL_LDFLAGS = -EL
endif

ifeq ($(ARCH),sparc64)
	GLOBAL_CFLAGS =
	GLOBAL_LDFLAGS =
endif

ifeq ($(ARCH),sparc)
	GLOBAL_CFLAGS =
	GLOBAL_LDFLAGS =
endif

ifeq ($(ARCH),m68k)
	GLOBAL_CFLAGS = -O0 -g -m68040
	KERNEL_CFLAGS = -fno-pic
	USER_CFLAGS = -fpic
	GLOBAL_LDFLAGS = -g
endif

ifeq ($(ARCH),alpha)
	GLOBAL_CFLAGS =
	GLOBAL_LDFLAGS =
endif

ifeq ($(ARCH),mips)
	GLOBAL_CFLAGS = -fno-pic -mips4 -meb -G 0
	GLOBAL_LDFLAGS =
endif

# check to see if we should use distcc and/or ccache
ifneq ($(USE_DISTCC),)
$(warning using distcc)
	CC := distcc $(CC)
endif

ifneq ($(USE_CCACHE),)
$(warning using ccache)
	CC := ccache $(CC)
endif

# these options are on for all architectures
GLOBAL_CFLAGS += -finline -fno-builtin
GLOBAL_CFLAGS += -Wall -W -Wno-multichar -Wno-unused-parameter -Wmissing-prototypes
GLOBAL_CFLAGS += -DNEWOS=1
GLOBAL_CFLAGS += -DARCH_$(ARCH)=1 -D__ARCH__=$(ARCH) -U$(ARCH)
GLOBAL_CFLAGS += -DPLATFORM_$(PLATFORM)=1

GLOBAL_CPPFLAGS = $(GLOBAL_CFLAGS)

GLOBAL_ASFLAGS += -D__ASSEMBLY__

# find libgcc
LIBGCC := -lgcc
LIBGCC_PATH := $(dir $(shell $(CC) $(GLOBAL_CFLAGS) -print-libgcc-file-name))
ifeq ($(ARCH),arm)
LIBGCC_PATH := /usr/local/arm-newos/lib/gcc-lib/arm-newos/3.3.3
endif
$(warning LIBGCC_PATH = $(LIBGCC_PATH))
ifneq ($(ARCH),sh4)
LIBGCC_INCLUDE += -I$(LIBGCC_PATH)/include
endif
ifeq ($(ARCH),x86_64)
LIBGCC32_PATH := $(dir $(shell $(CC) $(GLOBAL_CFLAGS) -m32 -print-libgcc-file-name))
$(warning LIBGCC32_PATH = $(LIBGCC32_PATH))
endif


# print some info
$(warning ARCH = $(ARCH))
$(warning PLATFORM = $(PLATFORM))
$(warning TARGET = $(TARGET))

# figure out where the build dir will be
BUILD_DIR = build/$(TARGET)
$(warning build dir will be $(BUILD_DIR))
$(shell mkdir -p $(BUILD_DIR))