Hi Liam,
Here I worked out a spec file to fit thesof/crosstool-NG in Clear Linux building environment.
It worked by adding below tar-balls and some changes.
But except for the crosstool-ng and xtensa-overlay, the others are common tool not real source.
Could you change the make file to regard those common tool as dependencies?
Source0 : https://github.com/thesofproject/crosstool-ng/archive/sof-v1.2-gcc8.1.tar.gz
Source1 : https://github.com/thesofproject/xtensa-overlay/archive/sof-v1.2-gcc8.1.zip
Source20 : https://ftpmirror.gnu.org/gnu/autoconf/autoconf-2.69.tar.xz
Source21 : https://ftpmirror.gnu.org/gnu/automake/automake-1.16.1.tar.xz
Source22 : https://gmplib.org/download/gmp/gmp-6.1.2.tar.xz
Source23 : http://www.mpfr.org/mpfr-3.1.6/mpfr-3.1.6.tar.xz
Source24 : http://isl.gforge.inria.fr/isl-0.19.tar.xz
Source25 : http://www.multiprecision.org/downloads/mpc-1.0.3.tar.gz
Source26 : http://downloads.sourceforge.net/project/expat/expat/2.2.5/expat-2.2.5.tar.b...
Source27 : https://ftpmirror.gnu.org/gnu/ncurses/ncurses-6.0.tar.gz
Source28 : https://ftpmirror.gnu.org/gnu/binutils/binutils-2.30.tar.xz
Source29 : https://ftpmirror.gnu.org/gnu/gcc/gcc-8.1.0/gcc-8.1.0.tar.xz
Source30 : https://ftpmirror.gnu.org/gnu/gdb/gdb-8.1.tar.xz
Best Regards & Thanks, Wang, Long