需求卡片 #358 · 相关性 高 · 新发现

递归 make 与并行编译的并发问题

更新于 2026/10/9 22:03:14

问题概述

在使用递归 make 时,-j 选项只能在顶层调用时有效,子 make 进程需要通过 $(MAKE) 传递 jobserver,否则并行调度会出现竞争条件。许多开发者发现现有的 jobserver 机制不稳定,需要升级 gmake 4.4 或手动设置 MAKEFLAGS,导致构建过程出现错误或性能下降。

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证据

原话 · @匿名
The `-j` is meant for the top-level invocation only, and the $(MAKE) pattern is standard.The `+` or $(MAKE) "tricks" to ensure the jobserver is inherited in submake and any other subprocess are no longer needed in gmake 4.4 (from 2022) because it defaults to a FIFO instead of pipes. The author should just upgrade gmake :).
原话 · @匿名
Setting environment variable `MAKEFLAGS=-j8` transfers to subprocesses.
原话 · @匿名
How it works is that the top-level invocation runs the job server, and the children feed requests to it. The top-level controls the parallelism.
原话 · @匿名
Don't do it!https://accu.org/journals/overload/14/71/miller_2004/Recursive Make Considered HarmfulBy Peter Miller

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