[bug] ld doesn't support ppc

[ChrisNonyminus]

When cctools is configured to target powerpc-apple-darwin, as assembles powerpc assembly without issue, but ld will not link it.

chrisnonyminus@DESKTOP-JLMSNKL:~/test/helloworld$ powerpc-apple-darwin-ld a.out -o test -arch ppc
ld: unknown/unsupported architecture name for: -arch ppc
chrisnonyminus@DESKTOP-JLMSNKL:~/test/helloworld$ powerpc-apple-darwin-ld -v
@(#)PROGRAM:ld  PROJECT:ld64-609
BUILD 17:46:02 Mar  3 2022
configured to support archs: armv6 armv7 armv7s arm64 arm64e arm64_32 i386 x86_64 x86_64h armv6m armv7k armv7m armv7em (tvOS)
LTO support using: LLVM version 10.0.0 (static support for 26, runtime is 26)```

[Gcenx]

ld64-127 was the last version from Apple to support ppc

[Wohlstand]

Recently I attempted to review the difference between the current ld64 and the ld64-127.2, and I attempted to backport PowerPC-related parts but hadn't completed that yet. On another side, I want to get a shot to make the ld64-127 work here. How much the modded ld64 is different from the official ld64?

[Wohlstand]

P.S. I attempting to make a cross-compiler toolchain to run my experimental stuff on my Mac Mini G4, however, it's a pain to build the code on it because of a very weak processor, and therefore a cross-compiler for modern Linux should simplify this. I built everything except GCC: it fails to build the thing because of the ld64...

[Wohlstand]

I made the first attempt here: master...Wohlstand:cctools-port:ppc-revive
I had to compare two versions: 127.2 and 128.2 to see what parts of the code were changed in order to remove PowerPC support. So, I attempted to restore that code to the latest version (which appears in this repository here). Trying some to verify its work and make the thing work...