fix: COPY .cargo/ into both image builders (regression from #313), and correct the RUSTFLAGS fallback tier - #314
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…lback tier Two findings from a CodeRabbit review that posted at 20:56 and that I merged past at 21:02. Both are correct. The first is a regression I introduced in #313 and it breaks both image builds. ## CRITICAL — both Dockerfiles referenced a file the image does not contain #313 converted the Dockerfiles from `ENV RUSTFLAGS="-C target-cpu=..."` to `cargo --config .cargo/config-vN.toml` to stop the RUSTFLAGS env from wiping the crypto-backend cfgs. That fix is right and stands. What it missed: both Dockerfiles COPY selectively BY DESIGN (the Dockerfile says so at its own COPY block), and neither names `.cargo/`. The old env form had no file dependency; the new form does, and the file was never in the image. Verified, two-sided, in a scratch crate: cargo --config .cargo/config-v3.toml build (absent) exit 101 cargo --config .cargo/config-v3.toml build (present) exit 0, Finished So the first RUN in each image would have failed before compiling anything. Fixed with `COPY .cargo/ .cargo/` ahead of the RUN block in both files. Checked rather than assumed: the COPY precedes every `RUN cargo` (Dockerfile 82 < 98, Dockerfile.avx512 56 < 68); `.dockerignore` does not exclude `.cargo/`; all nine config files are git-tracked and therefore in the build context. Root cause worth keeping: I changed a build I cannot run — there is no Docker daemon in this container — and did not check that the file the new flag names is present in the image. A `--config` path is a build INPUT, not just a flag. ## The fallback tier was misstated, and my own measurement disproves it `CLAUDE.md` read: RUSTFLAGS "silently drops `-Ctarget-cpu=x86-64-v4` and the arm measures v3". Wrong. RUSTFLAGS replaces EVERY config rustflags entry, so it drops the DEFAULT config's target-cpu too, not only the overlay's. The measurement from this same session is the disproof: `RUSTFLAGS="-D warnings"` produced ZERO `-Ctarget-cpu` flags against 65 with the env unset. The build gets rustc's own default for the target, the `x86-64` baseline (SSE2), which is LOWER than v3 and is precisely the tier `simd_avx2.rs`'s intrinsics SIGILL on. The sentence was wrong before the native flip too; the flip only changed which config gets discarded. Corrected in place with the numbers. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DCfrD5y19cvFc4AoyydXYv
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📝 WalkthroughWalkthroughThe Docker build definitions now copy ChangesAVX build support
Priority: ⬇️ Low Estimated code review effort: 1 (Trivial) | ~5 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🔵 Low · up to The Docker fixes are sound, but maintainers could misinterpret native SIMD measurements until the conflicting workflow comment is corrected. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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@coderabbitai review Requesting explicitly: the automatic pass was refused at 21:05 while rate-limited, and the quota note said the next included review would be available in 24 minutes. Asking rather than merging past it, because this PR exists because I merged past your review on #313. You had already posted the Generated by Claude Code |
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Inline comments:
In `@CLAUDE.md`:
- Around line 144-156: Update the native-arm fallback comment in
scripts/masking-parity.sh around the masking-parity workflow description to
state that setting RUSTFLAGS replaces configured rustflags, removes
target-cpu=native, and leaves rustc’s generic x86-64/SSE2 baseline rather than
v3. Keep the documented native v3, default, and v4 workflow behavior accurate.
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CodeRabbit on #314. `scripts/masking-parity.sh:26-30` carried the identical claim this PR already corrected in CLAUDE.md: that a set RUSTFLAGS makes the arm "measure v3 while claiming v4". Sharper than a duplicate: CLAUDE.md's correction CITES this script as the place the trap is documented, so the doc was fixed while the source it points at still taught the wrong number. An exhaustive grep confirms these were the only two instances outside the blackboard's historical record. The correction, with this session's own measurement: RUSTFLAGS replaces EVERY config rustflags entry, including the DEFAULT config's own `-Ctarget-cpu`, so no target-cpu reaches rustc and the build lands on the generic `x86-64` baseline (SSE2) — BELOW v3, and the tier `simd_avx2.rs`'s intrinsics SIGILL on. Measured: `RUSTFLAGS="-D warnings"` emitted ZERO `-Ctarget-cpu` flags against 65 with the env unset. Also states what the arm now IS, since the default flip: it names no tier and builds whatever config wins, by default `target-cpu=native`. Read the program's own `avx512f=` header for the tier, or pin config-v3 for AVX2. Verified the script still runs both ways: bash scripts/masking-parity.sh native PASS, avx512f=true CARGO_ARGS='--config .cargo/config-v3.toml' ... native PASS, avx512f=false Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DCfrD5y19cvFc4AoyydXYv
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Follow-up to #313. Two CodeRabbit findings that posted before I merged and that I merged past by polling CI without re-checking reviews. Both are correct; the first is a regression I introduced.
Critical: both Dockerfiles referenced a file the image does not contain
#313 converted the Dockerfiles from
ENV RUSTFLAGS="-C target-cpu=..."tocargo --config .cargo/config-vN.toml, to stop the RUSTFLAGS env from wiping the two crypto-backend cfgs. That reasoning stands. What it missed: both Dockerfiles COPY selectively by design — the Dockerfile says so in its own COPY block — and neither names.cargo/. The old env form had no file dependency. The new form does, and the file was never in the image.Verified two-sided in a scratch crate, since there is no Docker daemon in the dev container:
cargo --config .cargo/config-v3.toml builderror: failed to parse value from --config argument, exit 101Finished, exit 0So the first
RUNin each image would have failed before compiling anything.Fixed with
COPY .cargo/ .cargo/ahead of the RUN block in both files. Checked rather than assumed:RUN cargo(Dockerfile82 < 98,Dockerfile.avx51256 < 68).dockerignoredoes not exclude.cargo/Root cause worth keeping: I changed a build I cannot run here and did not check that the file the new flag names is present in the image. A
--configpath is a build input, not just a flag.The RUSTFLAGS fallback tier was misstated, and my own measurement disproves it
CLAUDE.mdread: RUSTFLAGS "silently drops-Ctarget-cpu=x86-64-v4and the arm measures v3".Wrong. RUSTFLAGS replaces every config rustflags entry, so it drops the default config's target-cpu as well, not only the overlay's. The measurement from the same session is the disproof:
-Ctarget-cpuflags emitted-D warningsWhat you actually get is rustc's own default for the target, the
x86-64baseline (SSE2). That is lower than v3, and it is precisely the tiersimd_avx2.rs's intrinsics SIGILL on. The sentence was wrong before the native flip too; the flip only changed which config gets discarded. Corrected in place with the numbers.Process note
The lesson this repo already recorded — wait for the belated review pass before merging — I followed on the earlier rounds and dropped on the last one. I polled CI to completion and merged without re-reading reviews posted since the final push. CodeRabbit's review was six minutes old at merge time.
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Summary by CodeRabbit
Documentation
Build Improvements