# Download and build GNU toolchain for Atmel AVR microcontrollers

# Copyright (C)2013-2018, Philip Munts, President, Munts AM Corp.
#
# 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.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.

CC		= gcc
CXX		= g++
FIND		= find
SED		= sed
TAR		= tar
TEMP		?= /tmp

BINUTILVER	= 2.32
BINUTILSERVER	= http://ftp.gnu.org/pub/gnu/binutils
BINUTILDIST	= $(TEMP)/binutils-$(BINUTILVER).tar.bz2
BINUTILURL	= $(BINUTILSERVER)/`basename $(BINUTILDIST)`
BINUTILSRC	= binutils-$(BINUTILVER)
BINUTILBLD	= build/binutils-$(BINUTILVER)

GCCVER		= 8.3.0
GCCSERVER	= http://ftp.gnu.org/pub/gnu/gcc/gcc-$(GCCVER)
GCCDIST		= $(TEMP)/gcc-$(GCCVER).tar.gz
GCCURL		= $(GCCSERVER)/`basename $(GCCDIST)`
GCCSRC		= gcc-$(GCCVER)
GCCBLD		= build/gcc-$(GCCVER)

LIBICONVVER	= 1.15
LIBICONVSERVER	= http://ftp.gnu.org/pub/gnu/libiconv
LIBICONVDIST	= $(TEMP)/libiconv-$(LIBICONVVER).tar.gz
LIBICONVURL	= $(LIBICONVSERVER)/`basename $(LIBICONVDIST)`
LIBICONVSRC	= libiconv-$(LIBICONVVER)

AVRLIBCVER	= 2.0.0
AVRLIBCSERVER	= http://download.savannah.gnu.org/releases/avr-libc
AVRLIBCDIST	= $(TEMP)/avr-libc-$(AVRLIBCVER).tar.bz2
AVRLIBCURL	= $(AVRLIBCSERVER)/`basename $(AVRLIBCDIST)`
AVRLIBCMPDIST	= $(TEMP)/avr-libc-manpages-$(AVRLIBCVER).tar.bz2
AVRLIBCMPURL	= $(AVRLIBCSERVER)/`basename $(AVRLIBCMPDIST)`
AVRLIBCUMDIST	= $(TEMP)/avr-libc-user-manual-$(AVRLIBCVER).tar.bz2
AVRLIBCUMURL	= $(AVRLIBCSERVER)/`basename $(AVRLIBCUMDIST)`
AVRLIBCSRC	= avr-libc-$(AVRLIBCVER)
AVRLIBCBLD	= build/avr-libc-$(AVRLIBCVER)

PKGVERSION	= $(shell date +%Y.%j)
PKGNAME		= avr-mcu-tools
INSTBASE	= $(shell pwd)/$(PKGNAME)

ifeq ($(findstring CYGWIN, $(shell uname)), CYGWIN)
PKGSUFFIX	= cygwin
TARBALL		= $(PKGNAME)-$(PKGVERSION)-$(PKGSUFFIX).tgz
endif

ifeq ($(shell uname), Darwin)
PKGSUFFIX	= $(shell uname -s)-$(shell uname -r)-$(shell uname -m)
SED		= gsed
TAR		= gnutar
TARBALL		= $(PKGNAME)-$(PKGVERSION)-$(PKGSUFFIX).tgz
TAROWNER	= --owner root
TARGROUP	= --group wheel
endif

ifeq ($(shell uname), Linux)
OSNAME		?= unknown
PKGARCH		= $(shell dpkg --print-architecture)
PKGSUFFIX	= $(OSNAME)-$(PKGARCH)
PKGDIR		= $(PKGNAME)-$(PKGVERSION)-$(PKGSUFFIX)
PKGFILE		= $(PKGDIR).deb
TARBALL		= $(PKGNAME)-$(PKGVERSION)-$(PKGSUFFIX).tgz
TAROWNER	= --owner root
TARGROUP	= --group root
endif

ifeq ($(shell uname), OpenBSD)
CC		= egcc
CXX		= eg++
TAR		= gtar
PKGFILE		= $(PKGNAME)-$(PKGVERSION)-openbsd$(shell uname -r)-$(shell uname -p).tgz
endif

BUILDCONFIG	= CC=$(CC) CXX=$(CXX)

default: readme.done

################################################################################

DISTFILES	= $(BINUTILDIST) $(GCCDIST) $(LIBICONVDIST) $(AVRLIBCDIST) $(AVRLIBCMPDIST) $(AVRLIBCUMDIST)

# Download source distributions

download: $(DISTFILES)

################################################################################

# Unpack all source distributions

source.done: $(DISTFILES)
	$(TAR) xjf $(BINUTILDIST)
	$(TAR) xzf $(GCCDIST)
	cd $(GCCSRC) ; ./contrib/download_prerequisites
	$(TAR) xzf $(LIBICONVDIST)
	ln -s "../$(LIBICONVSRC)" $(GCCSRC)/libiconv
	$(TAR) xjf $(AVRLIBCDIST)
	touch $@

################################################################################

# Download binutils

$(BINUTILDIST):
	wget -nv -P $(TEMP) $(BINUTILURL)

# Compile binutils

binutils.done: source.done
	rm -rf $(BINUTILBLD)
	mkdir -p $(BINUTILBLD)
	cd $(BINUTILBLD) && ../../$(BINUTILSRC)/configure --prefix=$(INSTBASE) $(BUILDCONFIG) --target=avr --enable-lto --disable-nls --disable-shared --disable-werror
	$(MAKE) $(MAKEJOBS) -C $(BINUTILBLD)
	$(MAKE) -C $(BINUTILBLD) install
	touch binutils.done

################################################################################

# Download libiconv

$(LIBICONVDIST):
	wget -nv -P $(TEMP) $(LIBICONVURL)

################################################################################

# Download gcc

$(GCCDIST):
	wget -nv -P $(TEMP) $(GCCURL)

# Compile gcc

gcc.done: binutils.done
	rm -rf $(GCCBLD)
	mkdir -p $(GCCBLD)
	cd $(GCCBLD) && ../../$(GCCSRC)/configure --prefix=$(INSTBASE) $(BUILDCONFIG) --target=avr --enable-lto --enable-languages=c,c++ --disable-libssp --disable-libgomp --disable-nls --disable-shared --disable-werror --with-system-zlib
	export PATH=$$PATH':'$(INSTBASE)/bin && $(MAKE) $(MAKEJOBS) -C $(GCCBLD)
	export PATH=$$PATH':'$(INSTBASE)/bin && $(MAKE) -C $(GCCBLD) install
	touch gcc.done

################################################################################

# Download avr-libc

$(AVRLIBCDIST):
	wget -nv -P $(TEMP) $(AVRLIBCURL)

$(AVRLIBCMPDIST):
	wget -nv -P $(TEMP) $(AVRLIBCMPURL)

$(AVRLIBCUMDIST):
	wget -nv -P $(TEMP) $(AVRLIBCUMURL)

# Compile avr-libc

avr-libc.done: gcc.done
	rm -rf $(AVRLIBCBLD)
	mkdir -p $(AVRLIBCBLD)
	cd $(AVRLIBCSRC) ; ./bootstrap
	export PATH=$$PATH':'$(INSTBASE)/bin && cd $(AVRLIBCBLD) && ../../$(AVRLIBCSRC)/configure --prefix=$(INSTBASE) --host=avr
	export PATH=$$PATH':'$(INSTBASE)/bin && $(MAKE) -C $(AVRLIBCBLD)
	export PATH=$$PATH':'$(INSTBASE)/bin && $(MAKE) -C $(AVRLIBCBLD) install
	$(TAR) xjf $(AVRLIBCMPDIST) --directory=$(INSTBASE)
	$(TAR) xjf $(AVRLIBCUMDIST) --directory=$(INSTBASE)/share
	touch avr-libc.done

################################################################################

# Create README.txt

readme.done: binutils.done gcc.done avr-libc.done
	echo "GNU AVR microcontroller toolchain"	>$(INSTBASE)/README.txt
	echo " "					>>$(INSTBASE)/README.txt
	echo "Built on `date` from:"			>>$(INSTBASE)/README.txt
	echo " "					>>$(INSTBASE)/README.txt
	echo "$(BINUTILSRC)"				>>$(INSTBASE)/README.txt
	echo "$(GCCSRC)"				>>$(INSTBASE)/README.txt
	echo "$(AVRLIBCSRC)"				>>$(INSTBASE)/README.txt
	unix2dos $(INSTBASE)/README.txt
	touch readme.done

################################################################################

# Create toolchain tarball

tarball: readme.done
	$(TAR) czf $(TARBALL) `basename $(INSTBASE)` --mode=ugo-w $(TAROWNER) $(TARGROUP)

################################################################################

# Create Debian package

package.deb: readme.done
	mkdir -p					$(PKGDIR)/DEBIAN
	mkdir -p					$(PKGDIR)/usr/local
	install -cm 0644 control			$(PKGDIR)/DEBIAN
	$(SED) -i s/@@ARCH@@/$(PKGARCH)/g		$(PKGDIR)/DEBIAN/control
	$(SED) -i s/@@NAME@@/$(PKGNAME)/g		$(PKGDIR)/DEBIAN/control
	$(SED) -i s/@@VERSION@@/$(PKGVERSION)/g		$(PKGDIR)/DEBIAN/control
	$(SED) -i /Version:/s/_/-/g			$(PKGDIR)/DEBIAN/control
	cp -R -P -p $(PKGNAME)				$(PKGDIR)/usr/local
	chmod -R ugo-w					$(PKGDIR)/usr/local/$(PKGNAME)
	fakeroot dpkg-deb --build			$(PKGDIR)
	chmod -R ugo+w					$(PKGDIR)

################################################################################

# Create OpenBSD package

fakeroot.openbsd: readme.done
	mkdir -p fakeroot.openbsd/usr/local
	cp -R -P -p $(PKGNAME) fakeroot.openbsd/usr/local

CONTENTS: fakeroot.openbsd
	echo "@owner root"				>CONTENTS
	echo "@group wheel"				>>CONTENTS
	echo "@mode -w"					>>CONTENTS
	echo "@cwd /usr/local"				>>CONTENTS
	find fakeroot.openbsd/usr/local/$(PKGNAME) -type d | awk '{ printf("@dir %s\n", substr($$1, 28)); }' >>CONTENTS
	find fakeroot.openbsd -type f | cut -c 28- | sort	>>CONTENTS
	find fakeroot.openbsd -type l | awk '{ printf("echo %s `readlink %s`\n", $$1, $$1); }' | sh | \
	awk '{ printf("@exec ln -s %s %s\n", $$2, substr($$1,17)); }'            >>CONTENTS
	find fakeroot.openbsd -type l | awk '{ printf("@unexec rm %s\n", substr($$1, 17)); }' >>CONTENTS

COMMENT:
	echo "AVR Microcontroller Toolchain"		>COMMENT

package.openbsd: CONTENTS COMMENT
	pkg_create -A `uname -m` -f CONTENTS -D COMMENT="`cat COMMENT`" -d COMMENT -p / -B fakeroot.openbsd $(PKGFILE)
	@-rm CONTENTS
	@-rm COMMENT

################################################################################

# Clean out working files

clean:
	rm -rf $(INSTBASE)
	rm -rf $(BINUTILSRC)
	rm -rf $(GCCSRC)
	rm -rf $(LIBICONVSRC)
	rm -rf $(AVRLIBCSRC)
	rm -rf build fakeroot.* *.done *.deb *.tgz $(PKGDIR)

distclean: clean