带有gnumake和先决条件的并行构建 [英] Parallel building with gnumake and prerequisites

问题描述

我的第一个问题(是！)是关于gnumake和并行构建的.这是一个简单的示例文件:

My first question (yay!) is about gnumake and parallel builds. Here's a quick example file:

.PHONY: tool_1 tool_2 tool_3 tool_4 all tools

all: | tools

tools: | tool_2 tool_3 tool_4

tool_1:
    # commands for tool 1

tool_2: | tool_1
    # commands for tool 2

tool_3: | tool_1
    # commands for tool 3

tool_4: | tool_1
    # commands for tool 4

如果我对这个人执行make -j，我在这里要确保在make尝试构建tool_[234]中的任何内容之前，恰好一次执行tool_1的命令吗?

If I do make -j on this guy, is what I have here correct to ensure that the commands for tool_1 are executed exactly once, and before make tries to build any of tool_[234]?

我正在寻找的是让make -j首先构建tool_1，然后并行构建tool_[234]，但不执行三次tool_1的命令.我希望这是有道理的.感谢您的任何建议或想法！

What I'm looking for is to have make -j cause tool_1 to be built first, then tool_[234] to be built in parallel, but without executing the commands for tool_1 three times. I hope that makes sense. Thanks for any suggestions or ideas!

推荐答案

make -j的行为与您在问题中所期望的完全一样.它不会多次建立依赖关系.

make -j behaves exactly as you expect in your question. It does not make dependencies multiple times.

该管道(|)字符在您的依赖项列表中做什么?

What does that pipe (|) character do in your dependency list?

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