Is there a "known good" combination of macOS silicon + FPC + Lazarus

[Thaddy]

Once you have the compiler, you can also bootstrap with it, although if they are the same version you need to add OVERRIDEVERSIONCHECK=1
(That may not always work in very rare cases, so be careful)
The -WM10.15 option is the most important one, though.
My M4 works with it and the -WM10.15 option for fpcupdeluxe was suggested by me and others. I had to cross-compile just once, two years ago.
After that I happy bootstrapped with a native compiler.