Emerge gcc 8.2 fails

[Jt0]

I'm unable to update gcc after cross-compiling for a Raspberry Pi 3 B+. GCC is at version 7.3, and it won't upgrade to anything higher than it currently is.
If there's a well-known reason for this, I wasn't able to find it by searching. I've included the information Portage instructed me to:

Build log: https://pastebin.com/2F61qyPi

Emerge --info: https://pastebin.com/vviVm2Kr

Emerge -pqv: https://pastebin.com/Bpht87Fs

Environment: https://pastebin.com/jqFhUyaV

Any ideas?

[Suicidal]

I’m no arm expert, but the build log says:

[erm67]

This is a bit strange:

CHOST="aarch64-hardfloat-linux-gnu"

hardfloat is mandatory for armv8 architecture so it is redundant and maybe it is what is causing problems

see also:
https://forums.gentoo.org/viewtopic-t-1042890-start-0.html
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[Jt0]

Follow up on this, erm67's response was exactly what was wrong. Changing that back to aarch64-unknown-linux-gnu allowed gcc to compile (although I realized I need to set up a proper cross-compiling toolchain on my desktop when the Pi took a day and a half to compile GCC). Odd that specifying something that should be redundant causes compilation errors. I didn't know when I set it up that hardfloat was required for armv8.