GNU Make-如何添加时间戳输出(只需最少的makefile修改) [英] GNU Make - how to add timestamp output (with minimal makefile modification)

问题描述

我想更好地了解自己的构建作业指标，但不幸的是，make本身并不输出时间戳.

I want to get a better idea of my build job metrics but unfortunately, make doesn't output timestamps per se.

如果我运行make --print-data-base，对于给定的目标，它将输出一行

If I run make --print-data-base, for a given target it outputs a line

#  Last modified 2016-08-15 13:53:16

但是那没有给我持续时间.

but that doesn't give me the duration.

问题

有没有办法在不修改每个目标的情况下获得建立目标的持续时间?有些目标位于makefile中，这些文件是在构建过程中生成的，因此无法修改其配方.

Is there a way to get duration of building a target without modifying each target? Some targets are inside makefiles which are generated DURING the build so not feasible to modify their recipes.

可能的解决方案

我可以执行预-并为每个目标添加后记，并以这种方式输出时间戳.

I could implement a pre- and post-recipe for every target and output a timestamp that way.

鉴于这是并行make，这是一个好主意吗?显然，通过为每个目标调用前后食谱会增加构建时间，但我对此表示满意.

Is that a good idea given this is parallel make? Obviously there would be increased build time from calling a pre- and post-recipe for every target but I'd be fine with that.

推荐答案

如果这是并行生成，则可以交错插入"preactions"，"actions"和"postactions".也就是说，您可能会得到如下输出:

If this is a parallel make, then the "preactions", "actions" and "postactions" may be interleaved. That is, you might get output like:

Pre-action 12:03:05
Pre-action 12:03:06
building foo...
building bar...
Post-action 12:04:17
Post-action 12:04:51

因此，您应该将TARGETNAME变量传递给操作前和操作后脚本.

So it would behoove you to pass a TARGETNAME variable to the pre-action and post-action scripts.

此外，当您并行运行事物时，还不需要知道开始和结束时间就知道操作需要多长时间.规则A可能比规则B花费更长的时间，这仅仅是因为规则B是单独运行，而规则A通过J与规则C共享处理器.

Also, start and end times are not all there is to know about how long an action takes, when you are running things in parallel; rule A might take longer that rule B, simply because rule B is running alone while rule A is sharing the processor with rules C through J.

除此之外，我认为这种方法没有问题.

Other than that, I see no problem with this approach.

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