实现 arm64 HarmonyOS 上的本地构建 - #64
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…接) 后添加与clang不兼容的flag
根本原因：`threading.Event` 一旦 `set()` 永久保持。当所有初始扫描任务恰好先完成时，`_pending` 短暂归零触发了 `_event.set()`，但主线程此时还在 `for` 循环中阻塞于 `scan_slots.acquire()`，未提交完所有顶层目录。等到主线程到达 `tracker.wait()` 时 event 早已 set，立即返回，后续条目被遗漏。 修复：增加了 `_all_submitted` 标志。只有同时满足「所有顶层条目已提交」和「所有扫描任务已完成」两个条件时，才设置 event 放行 `wait()`。
调整 PATH 让系统 cat 和 cp 命令优先级更高，避免使用 brew 的 cat 和 cp 命令 brew cat 会导致 cat: -: Broken pipe 报错，详见: https://atomgit.com/org/Harmonybrew/discussions/6 brew cp 会导致 libffi.so.8 复制失败并得到损坏的文件，报错如下： cp: error deallocating '……/WineHua/entry/libs/arm64-v8a/libffi.so.8': Permission denied 并且报错后cp依然以状态码0退出，所以编译不会失败，但最终得到的hap会闪退。
可通过 https://github.com/SwimmingTiger/command-line-tools/releases 下载 ohos 版 command-line-tools
比如 scripts/build_native.sh 的以下错误信息就会被 $() 吞掉： err "python3 with PyYAML is required. Install: pip3 install pyyaml"
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构建方法：
下载并解压鸿蒙原生 command-line-tools: https://github.com/SwimmingTiger/command-line-tools/releases
下载并解压鸿蒙原生 llvm-mingw: https://github.com/SwimmingTiger/llvm-mingw/releases
安装Harmonybrew并通过
brew命令安装依赖包：备注：
mesa那个缺少mako的报错不仅要安装mako，还得安装packaging才能解决。还有一些别的不记得了，可以看报错再装 (190598 修复了缺少
pyyaml的报错不可见)build-profile.json5已经测试过可以构建出可用的hap，并且签名功能也正常（在
build-profile.json5配置正确的证书就可以）。build-on-ohos.sh 会避免使用 brew 的 cat 和 cp 命令，它们产生的具体问题见 build-on-ohos.sh 的注释：
相关issue：
构建结果：