Go for Restic on PowerPC 32bits

Has anyone ever tried and succeeded in building Restic (written in Go) for a PowerMac 7450 (means 32 bits), I need it on an old Mac Mini ?

As I read gccgo could be the road to success and that gccgo comes with gcc, I tried to compile GCC with apple Xcode tools to get gccgo (following this tutorial : https://solarianprogrammer.com/2017/05/21/compiling-gcc-macos/)

but even the first step (compiling gmp) fails.

I’d like to read either a way to do it or the info that is not possible from someone who’s sure of it.

Thanks for your help