version=5.3.0
source=(\
http://ftp.gnu.org/gnu/gmp/gmp-6.1.0.tar.xz \
http://www.mpfr.org/mpfr-current/mpfr-3.1.3.tar.xz \
http://www.multiprecision.org/mpc/download/mpc-1.0.3.tar.gz \
http://ftp.gnu.org/gnu/gcc/gcc-$version/gcc-$version.tar.bz2 )

build()
{
cd  gcc-$version

cat gcc/limitx.h gcc/glimits.h gcc/limity.h > \
  `dirname $($LFS_TGT-gcc -print-libgcc-file-name)`/include-fixed/limits.h


for file in \
 $(find gcc/config -name linux64.h -o -name linux.h -o -name sysv4.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

mv -v ../mpfr-3.1.3 mpfr
mv -v ../gmp-6.1.0 gmp
mv -v ../mpc-1.0.3 mpc


mkdir -v build
cd build

CC=$LFS_TGT-gcc                                      \
CXX=$LFS_TGT-g++                                     \
AR=$LFS_TGT-ar                                       \
RANLIB=$LFS_TGT-ranlib                               \
../configure                                         \
    --prefix=/tools                                  \
    --with-local-prefix=/tools                       \
    --with-native-system-header-dir=/tools/include   \
    --enable-languages=c,c++                         \
    --disable-libstdcxx-pch                          \
    --disable-multilib                               \
    --disable-bootstrap                              \
    --disable-libgomp


make

make install

ln -sv gcc /tools/bin/cc

echo 'main(){}' > dummy.c
cc dummy.c
readelf -l a.out | grep ': /tools'

rm -v dummy.c a.out
mkdir -p $LFS/usr/lib
ln -sv /tools/lib/libgcc_s.so{,.1} $LFS/usr/lib
ln -sv /tools/lib/libstdc++.so{,.6} $LFS/usr/lib
sed 's/tools/usr/' /tools/lib/libstdc++.la > $LFS/usr/lib/libstdc++.la
}