name=gcc
version=9.2.0
gmp_version=6.1.2
mpc_version=1.1.0
mpfr_version=4.0.2
source=(http://ftp.gnu.org/gnu/gcc/gcc-$version/gcc-$version.tar.xz
	http://ftp.gnu.org/gnu/gmp/gmp-$gmp_version.tar.xz
	https://ftp.gnu.org/gnu/mpc/mpc-$mpc_version.tar.gz
	http://www.mpfr.org/mpfr-$mpfr_version/mpfr-$mpfr_version.tar.xz)

build() {
	if [ "$MULTILIB" = "yes" ]; then
		multilibopt="--with-multilib-list=m32,m64"
	else
		multilibopt="--disable-multilib"
	fi

	cd $name-$version

	mv -v ../mpfr-$mpfr_version mpfr
	mv -v ../gmp-$gmp_version gmp
	mv -v ../mpc-$mpc_version mpc
	
	for file in gcc/config/{linux,i386/linux{,64}}.h
	do
	  cp -uv $file{,.orig}
	  sed -e 's@/lib\(64\)\?\(32\)\?/ld@/tools&@g' \
		  -e 's@/usr@/tools@g' $file.orig > $file
	  echo '
	#undef STANDARD_STARTFILE_PREFIX_1
	#undef STANDARD_STARTFILE_PREFIX_2
	#define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"
	#define STANDARD_STARTFILE_PREFIX_2 ""' >> $file
	  touch $file.orig
	done
	
	if [ "$MULTILIB" = "yes" ]; then
		sed -i -e 's@/lib/ld-linux.so.2@/lib32/ld-linux.so.2@g' gcc/config/i386/linux64.h
		sed -i -e '/MULTILIB_OSDIRNAMES/d' gcc/config/i386/t-linux64
		echo "MULTILIB_OSDIRNAMES = m64=../lib m32=../lib32 mx32=../libx32" >> gcc/config/i386/t-linux64
	else
		sed -e '/m64=/s/lib64/lib/' \
		    -i.orig gcc/config/i386/t-linux64
	fi
	
	mkdir -v build
	cd       build

	../configure $multilibopt                              \
		--target=$LFS_TGT                              \
		--prefix=/tools                                \
		--with-glibc-version=2.11                      \
		--with-sysroot=$LFS                            \
		--with-newlib                                  \
		--without-headers                              \
		--with-local-prefix=/tools                     \
		--with-native-system-header-dir=/tools/include \
		--disable-nls                                  \
		--disable-shared                               \
		--disable-decimal-float                        \
		--disable-threads                              \
		--disable-libatomic                            \
		--disable-libgomp                              \
		--disable-libmpx                               \
		--disable-libquadmath                          \
		--disable-libssp                               \
		--disable-libvtv                               \
		--disable-libstdcxx                            \
		--enable-languages=c,c++
	make
	make install
}