禁止生成规则错误输出 [英] Suppress make rule error output

问题描述

我有一个创建目录的规则

I have an rule that creates a directory

bin:
    -mkdir $@

但是，第一次生成目录后，我会收到以下输出:

However after the first time the directory has been generated, I receive this output:

mkdir bin
mkdir: cannot create directory `bin': File exists
make: [bin] Error 1 (ignored)

有什么方法可以仅在目录不存在时运行规则，还是在目录已存在时禁止输出?

Is there some way I can only run the rule if the directory doesn't exist, or suppress the output when the directory already exists?

推荐答案

处理目录创建的传统方法是使用依赖于它的图章文件并创建dir作为副作用.制作distclean或任何真正干净"的目标时，请删除该图章文件:

The traditional way to handle directory creation is to use a stamp file that is depended on and creates the dir as a side effect. Remove the stamp file when making distclean or whatever your "really clean" target is:

bin/.dirstamp:
    mkdir -p $(DIRS)
    touch $@

bin/foo: bin/.dirstamp
    $(MKFOO) -o $@

distclean:
    rm -rf bin

这样做的原因如下:每当创建/删除bin中的文件时，将更新包含目录的mtime.如果目标依赖于bin，则下次make运行时，它将重新创建不需要的文件.

The reason for this is as follows: whenever a file in bin is created/removed, the mtime of the containing directory is updated. If a target depends on bin, then the next time make runs, it will then recreate files that it doesn't need to.

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