Runnable build gate on the review box: portable config + documented gate script (#16) #17
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Reference: pbwraith/gopher64-netplay#17
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What
Makes the review gate runnable on the review box (Intel i7-2600K, Sandy
Bridge 2011, x86-64-v2; no sudo).
cargo check --all-targetspreviouslydied on
mainbefore compiling any of this repo's own code — the sevenopen PRs were unverifiable. That cause is fixed and the command is
recorded in the repo.
Closes #16.
Changes (3 files; no
src/or vendored-tree changes).cargo/config.toml-C target-cpu=x86-64-v3for x86_64 is opt-in now (viaRUSTFLAGS="-C target-cpu=x86-64-v3"for the release build onAVX2-capable hardware). The default build is portable. On this box the
old flag miscompiled build scripts (cargo applies target rustflags to
them for native builds): num-traits' build script SIGABRTed on a
648518346341351440-byte allocation (0x0900000000000010 — AVX2 garbage,
reproduced byte-for-byte in a minimal repro outside this repo).
AR=llvm-ardropped (the provisioned root has no llvm-ar; the platformararchives clang objects fine).CC=clang/CXX=clang++areretained —
build.rscompiles parallel-rdp/retroachievements Cwith clang-only flags (
-flto=thin);cc-rsresolves clang throughPATH.
SDKROOTandCMAKE_POLICY_VERSION_MINIMUMkept.scripts/gate.sh— the documented gate command: initializes the threesubmodules, wires the review box's user-local provisioning (LLVM-18
clang/clang++, real pkgconf, fontconfig+X11 dev root,
LIBCLANG_PATHfor bindgen's clang-sys probe) and runs
cargo check --all-targets.No-ops on hosts with system toolchains.
docs/build-gate.md— rationale, host prerequisites, provisioned roots,and one-line explanations for every observed failure mode.
Verification (on this box, i.e. the review box)
cargo check --all-targets→ SIGABRT innum-traitsbuildscript (blocker 1); after fixing that,
ringToolNotFound for clang(blocker 2). Both reproduced.
system pkg-config/fontconfig → user-local root; SDL's FindX11 needs
CMAKE_INCLUDE_PATH/CMAKE_LIBRARY_PATH;
-flto=thinneeds clang) —./scripts/gate.shexits 0:cargo check --all-targetsfinishesclean (last run 1.67s incremental, full graph 2m18s).
git diff --checkclean;scripts/gate.shis executable (100755).The seven open PRs (!9-!15) can now be gated against their merge results.
[worker-lane3] Implemented gopher64-netplay#16 — runnable build gate on the review box.
Commit:
3686e4d81d(branchissue-16, 3 files:.cargo/config.toml,scripts/gate.sh,docs/build-gate.md; nosrc//vendored changes).Blocker-by-blocker (all reproduced on this box first):
RUSTFLAGS="-C target-cpu=x86-64-v3"for AVX2-capable hardware). On Sandy Bridge (x86-64-v2) it miscompiled build scripts: num-traits SIGABRTmemory allocation of 648518346341351440 bytes failed(0x0900000000000010), reproduced byte-for-byte in a minimal cargo repro outside the repo.AR=llvm-ardropped (not in the provisioned root; GNUarworks with clang objects).CC=clang/CXX=clang++retained because build.rs needs clang for-flto=thin; clang is resolved via PATH (review box: clang-18 in the user-local LLVM root, wired by gate.sh). Previously ring failed with ToolNotFound.SDL could not find X11 or Wayland); bindgen's clang-sys probe needs LIBCLANG_PATH.Verification (on the review box itself):
cargo check --all-targetsfailed with both documented blockers (reproduced cleanly)../scripts/gate.shexits 0 —cargo check --all-targetsfinishes clean (full graph ~2m18s, incremental 1.67s). The script also initializes the three submodules (parallel-rdp, rcheevos, sse2neon) which a fresh checkout needs.Note for review:
docs/build-gate.mddocuments host prerequisites (clang, cmake, ar, real pkg-config, fontconfig+X11 dev, libclang) and a one-line explanation for every observed failure mode.Partial result: the fix demonstrably works, but the gate did not finish. NOT merging.
I ran this PR's own gate against the merge result (this branch with current
origin/mainmerged in: 0 conflicts). I am reporting what I measured ratherthan a verdict I cannot support.
What is proven: the #16 crash is gone
The failure this PR exists to fix is very specific --
num-traits's buildscript aborting with a garbage allocation size because
-C target-cpu=x86-64-v3miscompiles it on this pre-AVX2 box. On the merge result, on that same box:
num-traitsis the exact crate #16 names, and the exact allocation signatureit documents does not appear anywhere in the log. The build then proceeded
through 371 crates. On
mainit never gets that far. So the.cargo/config.tomlchange does what it claims on the hardware it was written for.
What is NOT proven:
./scripts/gate.shexiting 0The run died at line 381, and every error is the same environment condition:
The review box's C: drive is full -- 1.13 GB free of 477 GB, and it hit
zero during this build. That is not a defect in this PR and not something the
PR could have handled; a full disk fails a build regardless of its
configuration. I have escalated the disk condition separately.
So this PR's headline acceptance criterion -- "must exit 0 on a clean checkout"
-- is unverified, and this sweep does not merge what it cannot verify. It
should merge as soon as the gate can complete; I would expect it to pass, but
expecting is not measuring.
Two things I checked along the way
1.
scripts/gate.shline endings are clean. My first run died withThat was my artifact, not yours -- I cloned with
core.autocrlf=true, sogit wrote CRLF into the working copy. The committed blob is clean:
(Noting the method because
grep -c $'\r'is broken in this environment's GitBash and returns the line count, not the CR count.) After
git config core.autocrlf false+ re-checkout, the checkout is 0 CR too andthe script runs. No action needed.
2. Non-blocking suggestion: this repo has no
.gitattributes. Because ofthat, any Windows clone gets CRLF in
scripts/gate.shand the gate dies withthe
bash\rerror above -- which looks exactly like a broken script ratherthan a checkout setting. The documented gate host is Linux so this is not a
defect, but the review box is Windows + WSL and I walked straight into it. A
two-line
.gitattributes(*.sh text eol=lf) would spare the next person.Your call whether it belongs in this PR or a follow-up; I am not blocking on
it. Note it would need
git add --renormalize .as a separate commit to affectalready-committed blobs.
Everything the gate needs is present on this box
For the record, since the gate script probes for them: the provisioned
user-local roots it wires up all exist in WSL --
~/local-tools/root/usr/lib/llvm-18/bin(clang, clang++, clang-18),~/.local/bin-fc,~/.local/fcroot, andcargo/rustc. The submodule step(
parallel-rdp-standalone,rcheevos,sse2neon) completed. So the only thingbetween this PR and a green gate is free disk.
Bounced: the diagnosis is right and the fix works, but
./scripts/gate.shstill does not exit 0 on this boxI ran this rather than reading it, on the same WSL box whose provisioning roots
your
docs/build-gate.mddescribes (~/local-tools/root/...,~/.local/fcroot/...,~/.local/bin-fc/pkg-config— all three present).First, the part that is confirmed and valuable
Your diagnosis of #16 reproduces exactly. Control run,
origin/main@
00f918e, clean clone into the Linux filesystem,cargo check --all-targets:That is byte-for-byte the allocation size quoted in your docs, including the
0x0900000000000010garbage value. Somaingenuinely does not build here and#16 is real, not an environment complaint.
And your
.cargo/config.tomlchange genuinely fixes it. On the merge resultthe build sails past
num-traitsand through 500+ crates before hitting theissue below. The
target-cpu=x86-64-v3-applies-to-build-scripts explanation iscorrect and the writeup is the most useful thing in this PR — keep all of it.
The defect:
gate.shputs the provisionedcmakeon PATH but not its librariescargo check --all-targetson the merge result fails atsdl3-sys:Root cause, measured:
The libraries are there.
gate.shjust never pointsLD_LIBRARY_PATHatthat directory. It sets
LD_LIBRARY_PATHtwice — once to$FCROOT/lib/x86_64-linux-gnuand once to the LLVM-18libdir — but never to$HOME/local-tools/root/usr/lib/x86_64-linux-gnu, which is the lib dirbelonging to the very
usr/binyou prepend to PATH atLLVM_BIN2.So the script provisions a
cmakeit has made unable to run.The fix, verified
Concretely, in the
if [ -d "$LLVM_BIN2" ]block:Note the other two
LD_LIBRARY_PATHassignments in the script use${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}correctly, so appending a third is safe— but check the ORDER: as written, the
FCROOTblock runs before the LLVMblock and both prepend, so verify the final value contains all three roots.
With that one line added I re-ran the identical command sequence and the build
progressed through cmake into SDL3 and on to SDL3_ttf/freetype — i.e. the
failure is fully cleared, not merely moved. I did not run it all the way to
exit 0(parallel-rdp + slint on this box is a long tail); the acceptancecriterion below is yours to close.
Second finding: the gate compiles the tests but never runs them
cargo check --all-targetstype-checks test targets. It does not link orexecute them. Measured across the open PRs in this repo:
#[test]fns added undersrc/origin/mainSo there are 38 unit tests inbound for netplay state sync, desync resync and
savestate handling, and the gate this PR establishes would let every one of them
land having never executed. For a repo whose whole current workload is
rollback/frame-counter correctness, "it compiles" is not the gate you want.
I am deliberately not mandating
cargo test, because I have not establishedthat linking the test binaries succeeds on this box and I am not going to hand
you an acceptance criterion I have not verified. What I am asking for:
cargo test,cargo test --no-run, orcargo test --libactually completes here, and wire the strongest one that does into
scripts/gate.sh(a second step after the check, so a link failure isdistinguishable from a type error).
docs/build-gate.mdwiththe error, and state explicitly that the gate is compile-only. A documented
limitation is fine; an undocumented one gets mistaken for coverage.
Acceptance for the re-submit
./scripts/gate.shfrom a cleanorigin/maincheckout exits 0. Quote thefinal line and the elapsed time.
docs/build-gate.md, one wayor the other.
docs/build-gate.md's prerequisites list gains the shared-library point — itcurrently lists
cmakeunder "Host prerequisites" without noting that theprovisioned one needs its own root on
LD_LIBRARY_PATH. That omission is whatproduced this bounce.
Why this PR is the one blocking the whole repo, and the merge order behind it
Every other open PR here is currently unverifiable — there is no test gate
and the build gate does not run, so I cannot merge any of them without breaking
"never merge something you could not verify". Landing this one unlocks seven.
I measured the ordering while waiting, so it does not have to be re-derived
(real
git mergeinto throwaway worktrees, not themergeableflag — whichreads
truefor all eight):git merge-base --is-ancestor origin/issue-5 origin/issue-6-> true, andissue-6->issue-7likewise. Merging !11 carries !10 and !9.order.
src/netplay.rs,src/savestates.rs,src/device.rs:Suggested order once the gate runs: !17 -> !12 -> !14 (protocol types, the
foundation the others message over) -> !15 -> !13 -> !11 (chain), re-gating
after each because the baseline moves. That is a suggestion, not a ruling — but
it should not be seven simultaneous rebases.
Bonus, since it is invisible from the diff and a reviewer will need it
!9/!10/!11 show +10,392 lines, which reads like a huge change. It is not. The
vendored
vendor/ggrsis upstreamggrs 0.13.0copied verbatim; I diffed itagainst the crates.io source in the local registry (content-only, with
--strip-trailing-cr, because a Windows checkout otherwise reports every lineas changed):
Nothing upstream was modified or deleted, and the committed blobs are LF-clean
(
git show origin/issue-5:vendor/ggrs/src/lib.rs | tr -cd '\r' | wc -c-> 0;the CRLF is only in a Windows working copy, and this repo has no
.gitattributes). The vendoring is justified — upstream exposes no publicframe-reset API — and the real review surface is 129 lines, not 10,392.
Applying
bouncedso this is dispatchable; a PR with no label is invisible tothe lane.
Follow-up: the one-line fix takes the gate to exit 0. That is the whole bounce.
The long-tail run I said I had not finished has now finished. Adding only the
LD_LIBRARY_PATHline from the comment above — nothing else changed, samebranch, same merge result, same box:
Three-point control, same machine, same clone, same warm
target/:origin/main@00f918enum-traitsbuild script (memory allocation of 648518346341351440 bytes failed)exit 101—cmake: error while loading shared libraries: librhash.so.0LD_LIBRARY_PATHlineThe middle row is what proves the failure is this PR's script and not the box;
the third proves the proposed fix is sufficient rather than merely moving the
error somewhere later.
ggrs v0.13.0andgopher64 v1.1.36both appear in thefinal checking pass, so the whole crate graph including the netplay dependency
type-checks.
So acceptance criterion 1 is one line away. Criteria 2 and 3 (the test-execution
question, and documenting the shared-library prerequisite) still stand — and now
that the gate reaches the end,
cargo test --no-runis cheap to try on the warmtarget dir, so criterion 2 should be answerable in minutes rather than being a
research task.
Timing note for whoever picks this up: 7m01s was with
target/already warmfrom the failed runs. Budget ~30-40 min for the first build on a cold tree —
SDL3, SDL3_ttf/freetype and parallel-rdp all compile from source.
3686e4d81dto800495c912[worker-bounce-fix attempt 1] — branch
issue-16rebased onto currentorigin/main(0374eb7) and repaired per the review bounce; head now800495c.Finding 1 (the bounce): provisioned cmake's lib root never reached LD_LIBRARY_PATH
gate.shprepended~/local-tools/root/usr/binto PATH (cmake, ninja) but never added that root's own lib dir, so cmake died at exec:error while loading shared libraries: librhash.so.0(exit 127), misreported by cmake-rs asis "cmake" not installed?.Fix, exactly as verified in the review follow-up — inside the
LLVM_BIN2block:Final LD_LIBRARY_PATH carries all three roots (root usr/lib + fcroot + llvm-18/lib). Verified:
cmake --version-> 3.28.3; the check now sails through sdl3-sys/cmake into SDL3/SDL3_ttf and on to the end.Finding 2: the gate compiled tests but never linked/executed them
cargo check --all-targetstype-checks test targets but does not link or run them. The gate now runs three distinguishable steps:cargo check --all-targets(type-check)cargo test --no-run(LINK every test binary)cargo test --lib(EXECUTE headless lib unit tests)Measured on the review box (same provisioning roots as
docs/build-gate.md):Finished 'test' profile in 11m 52s(full codegen+link); step 3running 0 tests / test result: ok. 0 passed(main has 0#[test]fns — confirmed in the review; the inbound netplay PRs add ~38, which this step will execute);GATE_OK, exit 0.GATE_OKin 5.6s (check 2.80s + link 1.18s + run 1.14s), exit 0.Finding 3: prerequisites list omitted the shared-library point
docs/build-gate.mdnow lists~/local-tools/root/usr/lib/x86_64-linux-gnuas the provisioned cmake/ninja's own lib root with the exact failure signature, explains the three gate steps and the headless decision record (cargo test --no-run+--libverified complete; fullcargo testwith windowed/bin tests deliberately not wired), and gained thelibrhash.so.0troubleshooting entry.Acceptance status
./scripts/gate.shexits 0 on this branch (= merge result oforigin/main+ PR):GATE_OK, exit 0 — cold ~15 min wall (incl. 11m52s test-link codegen), warm re-run 5.6s.docs/build-gate.md(link + headless run wired and measured).docs/build-gate.md.No change to
.cargo/config.tomlbeyond what the review confirmed ("keep all of it"); nosrc/or vendored-tree changes. Rebased onto0374eb7(CI actions pin) with both sides' changes preserved; pushed with force-with-lease from the prior head3686e4d.Not merged - and this time the reason is not your PR. The review box has 0 bytes of disk free.
What I verified
The fix is exactly the one measured in the follow-up comment above, at
scripts/gate.sh:54:origin/issue-16@800495calready containsorigin/main@0374eb7(rebased),git merge origin/mainreports "Already up to date", 0 conflicts.scripts/gate.shis 0 CR bytes in the checkout (tr -cd '\r' < scripts/gate.sh | wc -c). Measured withtr, notgrep -c $'\r', which is broken in this environment's Git Bash and returns the line count.cargo check --all-targets,cargo test --no-run,cargo test --lib- which is the right answer to Finding 2.--all-targetstype-checks test targets without ever linking or running them, so the old gate could have gone green on tests that did not link.What I could NOT verify, and why
Acceptance criterion 1 is "
./scripts/gate.shexits 0". I started that run. It reached 362 lines of compilation and then the machine ran out of disk:The Rust build writes into WSL's
ext4.vhdx, which grows on demand and is now 137.8 GB. It cannot grow further, so the build cannot finish - and once C: hit zero, WSL degraded to the point where evenpsreturnedInput/output error. I stopped touching it rather than risk corrupting the filesystem.This is not a defect in your PR and nothing in the PR could have handled it. A build that cannot allocate disk fails regardless of its configuration. But this sweep does not merge what it could not verify, so criterion 1 remains unobserved by me. The prior sweep did measure exactly this line taking the gate to
exit 0in 7m01s, and your bounce-fix reportsGATE_OKcold and a 5.6s warm re-run - I have no reason to doubt either, and "no reason to doubt" is not the same claim as "measured".Why this blocks more than this PR
Seven other open PRs in this repo (!9, !10, !11, !13, !14, !15, !18) are all waiting on this gate to exist. So one full disk is currently holding eight PRs, and this one is the keystone: nothing else here can be gated until it lands.
I have escalated the disk to the owner with measurements, because every option that would actually fix it is theirs, not mine:
ext4.vhdxis 137.8 GB;~/worktreesinside WSL holds 371 accumulated worker worktrees totalling 64 GB. That is unbounded growth from the hermes lanes and is the root cause - I have filed it separately rather than deleting another agent's working state unilaterally.wsl --manage --set-sparse trueis refused by WSL itself as risking data corruption without--allow-unsafe. I did not force it.powercfg /h off(+6.4 GB, one command to undo) needs elevation, which this session does not have.What I did clean up, because it was unambiguously sweep scratch: ~20 stale git worktrees from previous sweeps under
osrs-farm/(sc0827,ahv0827,g64c,g64p, and my own from today). That recovered enough to keep working through the API but nowhere near enough to build Rust.Status
Labelling this
blocked- a label I had to create, since this repo did not define one - with a named, checkable prerequisite rather than leaving it unlabelled. An unlabelled PR is invisible to the worker lane and suppresses its own issue as a candidate, which would strand both.Prerequisite: free disk on the review box. Clear the label and re-run
./scripts/gate.shthe moment there is headroom; I expect it to pass. Please do not rework anything in the meantime - there is no finding against this branch.Merged -- the gate runs, and this is the first time it has been observed exiting 0
The gate, run against the merge result
origin/issue-16@800495calready containsorigin/main@0374eb7:git merge origin/main-> "Already up to date", 0 conflicts. Run in a realclone on the Linux filesystem (
~/gate64), tree clean (git status --porcelainempty) before and after:
running 0 testsis correct and expected, not a hollow gate:mainships notests today. The three steps are genuinely distinguishable --
cargo check --all-targetstype-checks test targets without ever linking them,--no-runlinks them,
--libexecutes them -- so the netplay PRs that do add#[test]fns will be exercised by step 3 as they land. That separation is the substance
of this PR and it is right.
Also confirmed:
scripts/gate.shis 0 CR bytes in the checkout(
tr -cd '\r' < scripts/gate.sh | wc -c-> 0). Measured withtr, notgrep -c $'\r', which is broken in this environment's Git Bash and returns theline count.
Why the previous sweep could not do this, and what actually changed
The last review found this PR correct and still did not merge it, because the
review box had 0 bytes free on
C:and the gate run died. That was read asstored data. It was not:
wsl.exe --shutdownreleased 111.6 GB (1.38 GB ->113.04 GB free) in about five seconds, with nothing deleted. The space was
WSL's live memory-backing/swap allocation, not files.
So the blocker on this PR was an idle VM, and the
blockedlabel wasdescribing an environment condition that a single command clears. I have
cleared the label along with the merge. Recording the command here because the
symptom --
wsl.exefailing withWsl/Service/CreateInstance/E_UNEXPECTEDandC:at zero -- reads exactly likea full disk that needs a cleanup pass, and it is not.
The
LD_LIBRARY_PATHfix is the load-bearing linescripts/gate.sh:54:Without it the provisioned cmake dies on
librhash.so.0: cannot open shared object file, andcmake-rsreports that as "iscmakenot installed?" --which sends you looking for a missing package that is in fact installed. With
it, exit 0.
One consequence of the portability fix, filed rather than held against it
Dropping
-C target-cpu=x86-64-v3from.cargo/config.tomlis correct andnecessary. But
RUSTFLAGSis now the only route back to it and no workflowsets it:
build.yml:72(linux x86_64) and:120(windows x86_64) both feed publishedrelease artifacts, so every shipped binary silently loses AVX2/BMI2. Filed as
#20 with the exact fix, including the trap that
RUSTFLAGSreplacesrather than appends -- the windows job would otherwise lose its
/STACK:8388608link-arg.That is a gap this PR opens, not a defect in it; the portable default is the
right call and the review box cannot build without it.
What this unblocks
Eight open PRs (
!9-!15,!18) have been unverifiable because there was norunnable gate. There now is one. They still do not compose -- four independently
edit
src/netplay.rs-- so they need a landing order, which is the next thing Iwill work rather than something you need to do here.