We switched specifically to macos-14 runners in
1a25a0ff74, since the macos-15
runners were notably slower at the time.
The macos-14 runners are being removed now, so we need to switch
to something else.
Before 1a25a0ff74 we occasionally
saw cases where the builds (with macos-latest, resolving to
macos-15 at the time) timed out; we'll have to see if this still
is the case now.
A quick comparison (with a single sample of each), of doing a
single-stage build (without PGO, without LTO) saw macos-14
completing at 3 h 5 m, macos-15 at 4 h 8 m, macos-26 at
4 h 33 m, and xcode-27 at 4 h 7 m - so there's a risk that this
still is 30% slower than macos-14 was.
Martin Storsjö
b0e913b08e