docs(plan): 构建程序无法在成功时说话 - #474
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openarch 的三机器模板发布后,用发布出去的包走完整条 `mcpp new --template openarch`: 生成的工程三个目标都构建得出,而 `mcpp run` 在两台有模拟器的机器上都失败。 成因是清单里的 `[xlings] deps` 是**声明**而不是安装触发器。⭐ 普通裸机工程遇不到, 因为板级包把模拟器写在索引描述符的平台 deps 里,那些随包安装。⚠️ 而构建程序没有办法说出这件事:一条 std::cerr 提示被写出来、实测、然后删掉 —— mcpp 只在构建程序**非零退出时**打印抓到的输出,于是它在最需要它的那些构建上一个字都 不打印。留着比不留更糟,因为它看起来像个修复。 ⇒ `mcpp:` 指令表里没有「成功但有话说」的通道。判据写在文档里:一个最小构建程序发出 `mcpp:warning`,构建**成功**且那行文字显示给用户,而 e2e 断言那行确实出现。
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只动文档。
模板发布后暴露的一个引擎缺口:⚠️ 我先写了一条
build.mcpp没有「成功但有话说」的通道。std::cerr提示,实测后删掉 —— mcpp 只在构建程序非零退出时打印抓到的输出,那条提示在最需要它的构建上一个字都不打印。留着比不留更糟,因为它看起来像个修复。判据已写进文档,供后续实现
mcpp:warning时用。