Implement support for Darwin PPC

[barracuda156]

This PR implements initial support for Darwin ppc32 and adds minor fixes for ppc64.

Building will require this to be merged too: nim-lang/csources_v1#7

[barracuda156]

2 failing checks do not seem related to either Darwin PPC or my patches. For example:

error: invalid argument '-std=c99' not allowed with 'C++'
error: invalid argument '-std=c99' not allowed with 'C++'
error: invalid argument '-std=c99' not allowed with 'C++'
Error: execution of an external compiler program 'g++ -c -std=gnu++14 -funsigned-char  -w -fmax-errors=3 -fpermissive -pthread -std=c99   -I/Users/runner/work/1/s/lib -I/Users/runner/work/1/s/tests/compiler -o /Users/runner/work/1/s/nimcache/tests/compiler/tasm.nim_2c5f2cba9af7f92986d3de1e753f3faa/@m..@s..@slib@[email protected] /Users/runner/work/1/s/nimcache/tests/compiler/tasm.nim_2c5f2cba9af7f92986d3de1e753f3faa/@m..@s..@slib@[email protected]' failed with exit code: 1

That file has not been modified, and -std=c99 was not added anywhere in my patches.

[Varriount]

I'll merge this once the csources PR is merged.

[Varriount]

@Araq Is there anything else that needs to be done in this PR?

[Araq]

But this affects the existing OSX and BSD targets!

[barracuda156]

@Araq Thank you for pointing this out! I will fix that. Of course, BSD should not be affected in any way.

Give me few days please, I am just back to Taiwan and building gcc12 across several machines. I will deal with this and csources PR later this week, I hope.

[Araq]

Likewise!

[barracuda156]

@Araq I assume that for MacOS hardcoding Clang does no good, since for x86 and aarch64 Clang is the default compiler anyway (both in Xcode and Macports, so nothing changes), while for ppc Clang should never be invoked (hardcoding breaks the build).
But if there is a reason to hardcode it, then it must exclude ppc and ppc64.

[github-actions]

This pull request is stale because it has been open for 1 year with no activity. Contribute more commits on the pull request and rebase it on the latest devel, or it will be closed in 30 days. Thank you for your contributions.

[barracuda156]

Forgot about this. Sorry.

I will give this another go next week.

[github-actions]

This pull request is stale because it has been open for 1 year with no activity. Contribute more commits on the pull request and rebase it on the latest devel, or it will be closed in 30 days. Thank you for your contributions.

[github-actions]

This pull request has been marked as stale and closed due to inactivity after 395 days.

[barracuda156]

This needs to be re-done. I will see if the thing can be built now.