src_name=gmp
version=6.1.2
archive_name=$src_name-$version.tar.xz
url0=https://gmplib.org/download/$src_name/$archive_name

src_dir=$src_dir_root/$src_name-$version
rm -Rf $src_dir
cd $src_dir_root
tar xf $archive_name

build_dir=$builds_dir_root/$pkg_name-$version-$target_gnu_triple
rm -Rf $build_dir
mkdir -p $build_dir
cd $build_dir

OLD_PATH=$PATH
export PATH=$cross_toolchain_dir_root/bin:$PATH

# at link time, the only way to tell gnu ld where to look for shared lib dependencies is to pass the -rpath-link option
export "CC=$target_gnu_triple-gcc -B$target_sysroot/nyan/glibc/current/lib -L$target_sysroot/nyan/glibc/current/lib -Wl,-rpath-link,$target_sysroot/nyan/glibc/current/lib -static-libgcc"
export 'CFLAGS=-O2 -pipe -fPIC'
$src_dir/configure				\
	--build=$build_gnu_triple		\
	--host=$target_gnu_triple		\
	--prefix=/nyan/toolchains/0		\
	--disable-shared
unset CFLAGS
unset CC

make -j $threads_n
make install DESTDIR=$target_sysroot

# cleanup and tidying
rm -Rf $target_sysroot/nyan/toolchains/0/share/info
rmdir -p $target_sysroot/nyan/toolchains/0/share || true
find $target_sysroot/nyan/toolchains/0 -type f -name '*.la' | xargs rm -f

rm -Rf $build_dir $src_dir

export PATH=$OLD_PATH