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ci: fix persistent macOS clang_rt.osx linker failure (stale target cache)

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The real cause was not a flaky runner image: the macOS Test job restored a
cached `target/` built against a previous runner Xcode, and that stale build
dir carried a clang compiler-rt search path (.../clang/<N>/lib/darwin) that no
longer exists on the current image, so the linker failed with
'ld: library clang_rt.osx not found' on every commit.

Fix: stop caching `target/` on the test job (cache only the download-heavy
registry/git dirs) and bump the cache key to v2 to discard the poisoned
caches. Also deleted the existing poisoned macOS caches. Reverted the macos-14
pin (it didn't help and that image is deprecating) back to macos-latest, which
is fine now that target/ is always built clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Sam Valladares 2026-06-29 16:37:02 -05:00
parent bf3e9583ff
commit cbb10c2b90
2 changed files with 18 additions and 10 deletions
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24
.github/workflows/ci.yml vendored
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@ -18,10 +18,15 @@ jobs:
fail-fast: false
matrix:
# Pin macOS to macos-14 (Sonoma): the rolling `macos-latest` image
# intermittently ships a broken compiler-rt path ("ld: library
# 'clang_rt.osx' not found"), which fails the Rust link step on an
# otherwise-green commit. macos-14 has a stable Xcode/clang toolchain.
os: [macos-14, ubuntu-latest]
# The "ld: library 'clang_rt.osx' not found" failure is NOT a flaky
# image. It is the linker resolving a clang compiler-rt search path
# (Xcode .../clang/<N>/lib/darwin) that no longer exists on the runner,
# because a STALE `target/` was restored from the cache after the
# runner image's default Xcode moved. The real fix is the cache change
# below (we no longer cache `target/`, and the key is bumped to v2 to
# discard the poisoned caches), so the runner choice is no longer
# load-bearing. macos-latest is fine again with a clean target dir.
os: [macos-latest, ubuntu-latest]
steps:
- uses: actions/checkout@v4
@ -30,17 +35,20 @@ jobs:
with:
components: clippy
- name: Cache cargo
- name: Cache cargo (registry only)
uses: actions/cache@v4
with:
# Deliberately NOT caching `target/`: a `target/` built against a
# different Xcode carries a stale clang compiler-rt search path that
# breaks the linker ("clang_rt.osx not found"). Cache only the
# download-heavy registry/git dirs; recompiling is cheap and correct.
path: |
~/.cargo/bin/
~/.cargo/registry/index/
~/.cargo/registry/cache/
~/.cargo/git/db/
target/
key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
restore-keys: ${{ runner.os }}-cargo-
key: ${{ runner.os }}-cargo-v2-${{ hashFiles('**/Cargo.lock') }}
restore-keys: ${{ runner.os }}-cargo-v2-
- name: Check
run: cargo check --workspace