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#
# This makefile allows to quickly build minimalistic cross-compilers
# for various targets. They only support the C language and do not
# support a C library.
#
# Copyright (C) 2014-2016 Aurelien Jarno <aurelien@aurel32.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# Support multiple makes at once based on number of processors
ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
njobs = -j $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
endif
gcc_major_version = 6
# GCC does not build with some hardening options and anyway we do not
# ship the resulting binaries in the package
toolchain_build_flags = CFLAGS="-g -O2" CXXFLAGS="-g -O2" CPPFLAGS="" LDFLAGS=""
target = $(filter-out %_,$(subst _,_ ,$@))
toolchain_dir = $(CURDIR)/cross-toolchain
stamp = $(toolchain_dir)/stamp-
binutils_src_dir = /usr/src/binutils
binutils_unpack_dir = $(toolchain_dir)/binutils-source
binutils_build_dir = $(toolchain_dir)/binutils-$(target)
gcc_src_dir = /usr/src/gcc-$(gcc_major_version)
gcc_unpack_dir = $(toolchain_dir)/gcc-source
gcc_build_dir = $(toolchain_dir)/gcc-$(target)
# We can not apply all the patches provided by GCC as they are architecture
# specific and some of them conflicts with each others. Anyway as it's a
# minimalistic cross compiler we don't need all the fixes.
gcc_patches = svn-updates.diff gcc-gfdl-build.diff
$(stamp)binutils_unpack:
mkdir -p $(binutils_unpack_dir)
cd $(binutils_unpack_dir) && \
tar --strip-components=1 -xf $(binutils_src_dir)/binutils-*.tar.*
touch $@
$(stamp)binutils_%: $(stamp)binutils_unpack
mkdir -p $(binutils_build_dir)
cd $(binutils_build_dir) && \
$(binutils_unpack_dir)/configure \
--build=$(DEB_BUILD_GNU_TYPE) \
--host=$(DEB_HOST_GNU_TYPE) \
--target=$(target) \
--prefix=$(toolchain_dir) \
--disable-nls \
--disable-plugins \
$(toolchain_build_flags)
$(MAKE) $(njobs) -C $(binutils_build_dir) all
$(MAKE) $(njobs) -C $(binutils_build_dir) install
touch $@
$(stamp)gcc_unpack:
mkdir -p $(gcc_unpack_dir)
cd $(gcc_unpack_dir) && \
tar --strip-components=1 -xf $(gcc_src_dir)/gcc-*.tar.* ; \
for p in $(gcc_patches) ; do \
cat $(gcc_src_dir)/patches/$$p | patch -p2 ; \
done
# work-around a missing file in gcc-source
cp $(gcc_unpack_dir)/gcc/doc/gcov-tool.texi $(gcc_unpack_dir)/gcc/doc/gcov-dump.texi
touch $@
$(stamp)gcc_%: $(stamp)binutils_% $(stamp)gcc_unpack
mkdir -p $(gcc_build_dir)
cd $(gcc_build_dir) && \
$(gcc_unpack_dir)/configure \
--build=$(DEB_BUILD_GNU_TYPE) \
--host=$(DEB_HOST_GNU_TYPE) \
--target=$(target) \
--prefix=$(toolchain_dir) \
--enable-languages="c" \
--disable-multilib \
--disable-libffi \
--disable-libgomp \
--disable-libmudflap \
--disable-libquadmath \
--disable-libssp \
--disable-nls \
--disable-shared \
--disable-threads \
--disable-tls \
--disable-plugins \
--with-gnu-as \
--with-gnu-ld \
--with-headers=no \
--without-newlib \
$(toolchain_build_flags)
$(MAKE) $(njobs) -C $(gcc_build_dir) all
$(MAKE) $(njobs) -C $(gcc_build_dir) install
touch $@
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