BINUTILS_VER=2.22
BINUTILS_URL=http://mirrors.kernel.org/gnu/binutils/binutils-$(BINUTILS_VER).tar.bz2
BINUTILS_TAR=binutils-$(BINUTILS_VER).tar.bz2

NEWLIB_VER=1.20.0
NEWLIB_URL=ftp://sources.redhat.com/pub/newlib/newlib-$(NEWLIB_VER).tar.gz
NEWLIB_TAR=newlib-$(NEWLIB_VER).tar.gz

GCC_VER=4.7.1
GCC_URL=http://mirrors.kernel.org/gnu/gcc/gcc-$(GCC_VER)/gcc-$(GCC_VER).tar.bz2
GCC_TAR=gcc-$(GCC_VER).tar.bz2

BASEDIR=$(shell pwd)

define checksum
@if grep -q '  $(subst .,\.,$(1))$$' SHA256SUMS; then			\
	grep '  $(subst .,\.,$(1))$$' SHA256SUMS | sha256sum -c;	\
else									\
	echo "WARNING: no checksum defined for $(1)";			\
fi
endef

all: gcc

src/$(BINUTILS_TAR):
	wget -P src $(BINUTILS_URL)
	$(call checksum,$@)

src/$(NEWLIB_TAR):
	wget -P src $(NEWLIB_URL)
	$(call checksum,$@)

src/$(GCC_TAR):
	wget -P src $(GCC_URL)
	$(call checksum,$@)

src/binutils-$(BINUTILS_VER): src/$(BINUTILS_TAR)
	tar -C src -xjf $<

src/newlib-$(NEWLIB_VER): src/$(NEWLIB_TAR)
	tar -C src -xzf $<

src/gcc-$(GCC_VER): src/$(GCC_TAR) src/newlib-$(NEWLIB_VER)
	tar -C src -xjf $<
	ln -s $(BASEDIR)/src/newlib-$(NEWLIB_VER)/newlib $@
	ln -s $(BASEDIR)/src/newlib-$(NEWLIB_VER)/libgloss $@

binutils: src/binutils-$(BINUTILS_VER)
	install -d build/binutils
	cd build/binutils; \
	$(BASEDIR)/$</configure --target=sh-elf --prefix=$(BASEDIR)/inst; \
	$(MAKE) -j3; \
	$(MAKE) install

gcc: src/gcc-$(GCC_VER) binutils
	install -d build/gcc
	cd build/gcc; \
	$(BASEDIR)/$</configure --target=sh-elf --prefix=$(BASEDIR)/inst -enable-languages=c --without-pkgversion --with-newlib; \
	$(MAKE) -j3; \
	$(MAKE) install

clean:
	rm -rf build inst

distclean: clean
	rm -rf src