#!/usr/bin/make -f
export DH_VERBOSE=1

target=xtensa-lx106-elf

GCC_VERSION=10
GCC_PACKAGE=gcc-$(GCC_VERSION)
GCC_DIR := /usr/src/gcc-10
GCC_TARBALL := $(notdir $(wildcard $(GCC_DIR)/gcc-*.tar.*))

package=gcc-xtensa-lx106
top_dir=$(shell pwd)
gcc_dir=/usr/src/$(GCC_PACKAGE)
doc_dir=/usr/share/doc/$(package)
build_doc_dir=$(top_dir)/debian/$(package)$(doc_dir)
stampdir=debian/stamp

source_version := $(shell dpkg-query -W -f="\$${Version}\n" $(GCC_PACKAGE)-source)
deb_version := $(source_version)+$(shell dpkg-parsechangelog | sed -ne "s/^Version: \(.*\)/\1/p")
deb_upstream_version := $(shell echo $(deb_version) | cut -d- -f1)
base_version := $(shell echo $(deb_version) | sed -e 's/\([1-9]\.[0-9]\).*-.*/\1/')
BUILT_USING := $(shell dpkg-query -f '$${source:Package} (= $${source:Version}), ' -W $(GCC_PACKAGE)-source)

unpack_stamp=$(stampdir)/unpack
tar_stamp=$(stampdir)/tar

build_dir=build

export DEB_BUILD_MAINT_OPTIONS=hardening=+all,-format
buildflags:=$(shell dpkg-buildflags --export=configure) INHIBIT_LIBC_CFLAGS="-DUSE_TM_CLONE_REGISTRY=0"

target_tools=\
	AR_FOR_TARGET=$(target)-ar \
	AS_FOR_TARGET=$(target)-as \
	LD_FOR_TARGET=$(target)-ld \
	NM_FOR_TARGET=$(target)-nm \
	OBJDUMP_FOR_TARGET=$(target)-objdump \
	RANLIB_FOR_TARGET=$(target)-ranlib \
	READELF_FOR_TARGET=$(target)-readelf \
	STRIP_FOR_TARGET=$(target)-strip

configure_flags = \
	--enable-languages=c,c++ \
	--prefix=/usr/lib \
	--infodir=/usr/share/doc/$(package)/info \
	--mandir=/usr/share/man \
	--htmldir=/usr/share/doc/$(package)/html \
	--pdfdir=/usr/share/doc/$(package)/pdf \
	--bindir=/usr/bin \
	--libexecdir=/usr/lib \
	--libdir=/usr/lib \
	--with-system-zlib \
	--enable-multilib \
	--disable-decimal-float \
	--disable-libffi \
	--disable-libgomp \
	--disable-libmudflap \
	--disable-libquadmath \
	--disable-libquadmath-support \
	--disable-libssp \
	--disable-libstdcxx-pch \
	--disable-libstdc++-v3 \
	--disable-nls \
	--disable-shared \
	--disable-threads \
	--disable-tls \
	--enable-lto \
	--enable-target-optspace \
	--disable-__cxa_atexit \
	--without-long-double-128 \
	--disable-multilib \
	--enable-cxx-flags=-fno-exceptions \
	--build=$(DEB_BUILD_GNU_TYPE) \
	--host=$(DEB_HOST_GNU_TYPE) \
	--target=$(target) \
	--with-gnu-as \
	--with-gnu-ld \
	--with-headers=no \
	--without-newlib \
	"--with-pkgversion=$(deb_version)" \
	--without-included-gettext \
	$(buildflags) \
	$(target_tools)

%:
	dh $@ -Dgcc-source -B$(build_dir)

$(unpack_stamp): $(tar_stamp)
	set -ex; \
		cd $(top_dir)/gcc-source; \
		for patch in $(shell cat debian/debian_patches.txt); do \
			echo Applying patch "$$patch"; \
			patch -p2 < $(gcc_dir)/patches/$$patch; \
		done
	set -ex; \
		cd gcc-*; \
		for patch in ../debian/local-patches/[0-9]*.patch; do \
			echo Applying patch "$$patch"; \
			patch -p1 < "$$patch"; \
		done
	touch $@

$(tar_stamp):
	tar xf $(GCC_DIR)/$(GCC_TARBALL)
	ln -s gcc-$(GCC_VERSION)* gcc-source
	cp debian/overlay/include/xtensa-config.h gcc-source/include/
	mkdir -p $(stampdir)
	cp /usr/share/doc/$(GCC_PACKAGE)-source/copyright debian/copyright-gcc
	touch $@

override_dh_autoreconf: $(unpack_stamp)
	autoreconf -f -i gcc-source

override_dh_auto_configure: $(unpack_stamp)
	mkdir -p $(build_dir)
	dh_auto_configure -Dgcc-source -B$(build_dir) -- $(configure_flags)

override_dh_auto_clean:
	rm -rf gcc-* $(build_dir) debian/tmp debian/copyright-gcc $(stampdir)
	dh_autoreconf_clean

override_dh_auto_test:
	@echo "no testing, that's way too painful"
#	dh_auto_test -Dgcc-source -B$(build_dir) --max-parallel=1

override_dh_gencontrol:
	dh_gencontrol -a -- -v$(deb_version) -Vlocal:Version=$(deb_upstream_version) -Vgcc:Version=$(source_version) -VBuilt-Using="$(BUILT_USING)"

override_dh_auto_install:
	mkdir -p $(top_dir)/debian/tmp
	cd build/xtensa-lx106-elf/libgcc/ && xtensa-lx106-elf-ar -M <$(top_dir)/debian/strip-libgcc-funcs.txt
	cd $(top_dir)/build && make install DESTDIR=$(top_dir)/debian/tmp

override_dh_installchangelogs:
	dh_installchangelogs gcc-source/ChangeLog

override_dh_compress:
	dh_compress -Xexamples/

override_dh_strip:
	dh_strip -X.a