After creating a new toolchain with the latest binutils & glibc, it became clear the very latest versions of those two represent too many issues. Glibc 2.28 already needs 3 major patches to be functional, just weeks after it's release, thus not a candidate to be used, 2.27 will be used instead.
Binutils 2.31.1 was also just released and despite of using several upstream recommended patches, linking with ld fails on Qt based packages (Qt itself is gold build here). This is also known upstream, so for binutils it is back to 2.30, using the latest commits from that branch.
All that was build on the new toolchain is getting rebuild.
As always with the build repo, on updates when you see newer local then in the repo, downgrade to the correct versions with sudo pacman -Suu