fix(ci): migrate LLVM build cache from runner.tool_cache to actions/cache

[mouliangyu]

背景

ci_sim.yml 目前把 LLVM 构建产物放在 runner.tool_cache 下，不同 LLVM 版本共享同一目录。当有人换 LLVM_REF/LLVM_TAG 时，各 runner 上残留的旧产物会互相污染，导致各种不一致的构建错误（如 smt.py 缺失、编译器不一致等）。

build_wheel.yml 和 build_wheel_mac.yml 已经在用 actions/cache@v4，本 PR 让 ci_sim.yml 对齐这个模式。

修改

• Resolve LLVM cache key：新增步骤，通过 git ls-remote 获取 LLVM 源 SHA，构建 key llvm-build-<sha>-assert-v1
• Restore LLVM build cache：构建前从 GitHub Cache 恢复 build 目录，continue-on-error: true 确保 cache 服务不可用时不会阻断流程
• Build LLVM/MLIR：当 CMakeCache 已存在（cache hit）时跳过 cmake，只跑 ninja 增量编译
• Save LLVM build cache：仅在 cache miss 时保存，continue-on-error: true
• 同时兼容 LLVM_TAG（未来 PR）和 LLVM_REF

效果

• 不同 LLVM 版本 → 不同 cache key → 隔离
• 同一 LLVM 版本 → 同一 cache key → 增量构建
• 多人改 LLVM 版本不会互相污染

🤖 Generated with Claude Code

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

[reedhecre]

Codex Review

该评论由 review 机器人自动更新。

• PR: fix(ci): migrate LLVM build cache from runner.tool_cache to actions/cache #802 fix(ci): migrate LLVM build cache from runner.tool_cache to actions/cache
• Author: mouliangyu
• Base/Head: main / codex/llvm-github-cache
• Head SHA: 0b36f8b5d5d8
• Trigger: PR 有新提交
• Generated At: 2026-06-11T12:00:46Z
• Previous Head SHA: 87b0ce75af2b
• Status: failed at codex-review (exit=1)

Summary

Review failed at stage codex-review: exit=1

Findings

未生成结构化 findings，因为 review 过程提前失败。

Log Tail

===== STAGE clone @ 2026-06-11 20:00:34 =====
set -euo pipefail
rm -rf '/tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/repo'
git clone --branch 'main' --depth 50 'https://github.com/hw-native-sys/PTOAS.git' '/tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/repo'
cd '/tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/repo'
git fetch origin 'refs/pull/802/head:pr-802' --depth 50
git fetch origin 'main' --depth 50 || true
git checkout -f 'pr-802'
git rev-parse HEAD
git diff --stat 'origin/main...HEAD' || true
Cloning into '/tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/repo'...
From https://github.com/hw-native-sys/PTOAS
 * [new ref]         refs/pull/802/head -> pr-802
From https://github.com/hw-native-sys/PTOAS
 * branch            main       -> FETCH_HEAD
Switched to branch 'pr-802'
0b36f8b5d5d867f6acf03ed8977df9266eabe673
 .github/workflows/ci_sim.yml | 58 ++++++++++++++++++++++++++++++++++++++------
 1 file changed, 51 insertions(+), 7 deletions(-)
===== END STAGE clone rc=0 @ 2026-06-11 20:00:42 =====

===== STAGE codex-review @ 2026-06-11 20:00:42 =====
set -euo pipefail
cd '/tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/repo'
'codex' exec -C '/tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/repo' -s read-only -c 'model_provider="codereview"' -c 'model="gpt-5.4"' -c 'model_reasoning_effort="xhigh"' --output-schema '/tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/review_schema.json' -o '/tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/codex_last_message.json' --color never - < '/tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/review_prompt.txt'
OpenAI Codex v0.115.0 (research preview)
--------
workdir: /tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/repo
model: gpt-5.4
provider: codereview
approval: never
sandbox: read-only
reasoning effort: xhigh
reasoning summaries: none
session id: 019eb68e-5b55-7380-a7b2-136576ce5bd3
--------
user
你现在在审查 GitHub PR。

仓库：hw-native-sys/PTOAS
PR：#802 fix(ci): migrate LLVM build cache from runner.tool_cache to actions/cache
作者：mouliangyu
base branch：origin/main
head branch：HEAD（当前已 checkout 到 PR head）

要求：
1. 只审查这个 PR 相对 origin/main 的改动，必要时可以看上下文文件。
2. 重点找真实的 correctness / regression / contract mismatch / CI / runtime / compatibility 问题。
3. 不要提纯风格建议，不要提低价值猜测。
4. 严格按优先级输出：
   - P1：高概率会导致错误结果、编译/运行失败、严重回归、发布阻断
   - P2：重要缺陷、行为回归、遗漏校验/测试、较大兼容性问题
   - P3：次要但明确可改的问题
5. 如果没有问题，summary 直接写：未检查到 PR #802 存在问题，并返回 findings=[]。
6. 如果有问题，summary 简洁概括，findings 里每条都要给出：
   - severity
   - title
   - body（说明为什么是问题，尽量具体）
   - file（尽量给相对路径）
   - line（能确定就填整数，否则 null）

建议先查看：
- git status --short
- git diff --stat origin/main...HEAD
- git diff --unified=80 origin/main...HEAD

最终输出必须严格匹配 JSON schema。

mcp startup: no servers
ERROR: exceeded retry limit, last status: 429 Too Many Requests, request id: 33e66588-fa7d-4abc-a048-2c62bdadaf31
Warning: no last agent message; wrote empty content to /tmp/ptoas-pr-review-monitor/runs/20260611_200032_pr802/codex_last_message.json
===== END STAGE codex-review rc=1 @ 2026-06-11 20:00:46 =====

[reedhecre]

A3 板测完成（有跳过）

• 触发方式：merged
• 源码提交：2170f47bd4a4
• 结果汇总：OK 221 / FAIL 0 / SKIP 1
• 日志：/home/zhongxuan/ptoas-board-monitor/runtime/logs/20260612_094005_merged_pr802.log
• 结果 TSV：/home/zhongxuan/ptoas-board-monitor/runtime/logs/20260612_094005_merged_pr802.tsv