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Martin Vogel 9bb891b669 ci: move macOS runners to macos-15 and pin the deployment target to 14.0
GitHub retires the macos-14 runner image on 2026-11-02, and its brownouts
already cancel our macos-14 jobs. Move every macos-14 runner reference to
macos-15 (arm64): the release darwin-arm64 build, the unix-macos14 and
tsan-mac test legs, the smoke-mac PR leg (its two matrix.os guards move in
lockstep), the release smoke, both soak legs, the memwaste event lane, the
bug-repro board, the cache warmer and the all-platform smoke. Lane names
stay unchanged: select-lanes.sh, ci-ok and the lane contracts key on them,
never on the runner label.

Two broad legs already ran on macos-15 (_test.yml BROAD_UNIX, _smoke.yml
BROAD_UNIX) and smoke.yml listed both images, so the moved legs would have
duplicated them. Those duplicates are dropped; PR CI keeps exactly the
same legs.

Without an explicit minimum, clang stamps the binary with the SDK's
default (LC_BUILD_VERSION minos), so a release built on macos-15 would
refuse to start on macOS 14. Makefile.cbm now folds
-mmacosx-version-min=14.0 into CC/CXX next to ARCHFLAGS for Apple targets
(detected from the compiler's target, not the host), so it reaches every
compile and link, vendored objects included, on every build path.

Proof on macOS 26.6 / SDK 26.5: the production binary built from
origin/main reports minos 26.0; with this change it reports minos 14.0,
with zero warnings under -Werror, no weak imports and an identical
undefined-symbol set. The test runner (direct make, no env.sh) is minos
14.0 too; platform and daemon_ipc suites pass.

Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>
2026-10-30 23:44:25 +01:00
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