[stable] GHA: Bump Xcode version to 15.1 for macOS-13 jobs

[ibuclaw]

Nearly a dozen bug fixes later, all woes on macOS / Xcode 15 might now be dealt with.

As there is no release of dmd with these fixes in yet, use ldc as the host D compiler for the interim until a new release is made.

[dlang-bot]

Thanks for your pull request, @ibuclaw!

Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	24407	critical	OSX: ld: Assertion failed: (slot < _sideTableBuffer.size()), function addAtom

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "stable + dmd#16240"

[ibuclaw]

Looks like CI found one more issue - https://issues.dlang.org/show_bug.cgi?id=24407

==============================
Test 'runnable/test17338.d' failed. The logged output:
/Users/runner/work/dmd/dmd/generated/osx/release/64/dmd -conf= -m64 -Irunnable  -fPIC  -od/Users/runner/work/dmd/dmd/compiler/test/test_results/runnable -of/Users/runner/work/dmd/dmd/compiler/test/test_results/runnable/test17338_0  runnable/test17338.d 
0  0x108b95f43  __assert_rtn + 64
1  0x108b61e75  ld::AtomFileConsolidator::addAtomFile(ld::AtomFile const*, ld::AtomFile const*, bool) + 8997
2  0x108b6fa78  ld::AtomFileConsolidator::addAtomFile(ld::AtomFile const*) + 136
3  0x108b94287  ld::pass::stubs(ld::Options const&, ld::AtomFileConsolidator&) + 2039
4  0x108b79184  ld::AtomFileConsolidator::resolve() + 18564
5  0x108ae4db8  main + 12344
ld: Assertion failed: (slot < _sideTableBuffer.size()), function addAtom, file AtomFileConsolidator.cpp, line 2158.
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Error: linker exited with status 1
==============================

[ibuclaw]

Find solace that we're not alone actions/runner-images#9273 / https://forums.developer.apple.com/forums/thread/737707

[ibuclaw]

Checking Xcode 15.1...

[ibuclaw]

Checking Xcode 15.1...

So, it turns out that Xcode 15.0.1 is a broken release for both DMD and GCC alike, and Apple have fixed it in Xcode 15.1.

That linker ICE is not worth the investigation, but we now have to switch to Xcode in the other direction to 15.1 instead while we wait for GHA to bump the default again.

[ibuclaw]

@thewilsonator build is green, just updated commit and this PR title to reflect new change.

https://github.com/dlang/dmd/actions/runs/8027176846/job/21930810494

[kinke]

Very nice! 👍