在 CMake 中默认构建自定义目标 [英] Build custom target by default in CMake

问题描述

我想用 cmake 运行一个自定义命令.这听起来像是一个非常简单的任务/问题，但令人沮丧的是找到一个例子是多么困难.

I'd like to run a custom command with cmake. That sounds like an incredibly simple task/question, but it's frustrating how difficult it is to find an example.

这是我正在尝试做的:

$ cmake .
$ make
> Hello World! (Output)

在 Gnu 中使这很容易:

In Gnu Make that's very easy:

bar: 
        echo Hello World!

但我试图在 cmake 中做到这一点.根据我一直在阅读的内容，我应该可以使用下面的 CMakeLists.txt 文件来做到这一点:

But I'm trying to do this in cmake. Based on what I've been reading, I should be able to do that with the CMakeLists.txt file below:

cmake_minimum_required(VERSION 3.6)
project(foo)
add_custom_target(bar)
add_custom_command(
  TARGET   bar
  COMMAND  "echo Hello World!"
)

如果我只是调用make，目前没有工作要做.我需要显式调用 make bar.如何将 bar 添加到 all 配方?

Currently there is no work to do if I just call make. I need to explicitly call make bar. How can I add bar to the all recipe?

我已经尝试添加 add_dependency(foo bar)，但是 foo 是一个不存在的目标.如果有一些我不知道的超级目标，那就完美了.然后我就可以将它用作我的自定义命令的目标，而不用打扰 bar.

I've tried adding add_dependency(foo bar), but foo is a non-existent target. If there is some super-target that I'm unaware of that would be perfect. Then I could just use that as the TARGET for my custom command and not bother with bar.

推荐答案

使用 ALL 选项来构建目标默认:

Use ALL option for build the target by default:

add_custom_target(bar ALL)

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