cmake项目仅构建一个特定的可执行文件（及其依赖项） [英] cmake project build only one specific executable (and its dependencies)

问题描述

我有一个大致如此结构的CMake项目：

 。 
 |-库1 
 | |-CMakeLists.txt 
 |-library2 
 | |-CMakeLists.txt 
 |-可执行文件
 | |-CMakeLists.txt 
  

在可执行文件中我生成我的2个可执行文件。我想知道是否有可能仅生成一个可执行文件及其依赖项而不是全部。我听到了有关cmake -target 选项的信息，但是我无法使其与 cmake / 3.13.4 一起使用。

解决方案

这里有两个潜在的问题。首先，典型的CMake工作流程将 build 文件夹放置为顶级CMake文件的同级文件。因此，您的文件层次结构应如下所示：

 。 
 |-CMakeLists.txt 
 |-library1 
 |- |-CMakeLists.txt 
 |-library2 
 | |-CMakeLists.txt 
 |-可执行文件
 | |-CMakeLists.txt 
 |-build< ------------从这里运行CMake命令。 
  

这会将所有CMake生成的文件隔离到 build 文件夹。其次，您必须小心在适当的位置运行CMake构建阶段。我们可以从 build 文件夹中运行所有内容，例如：

1. 要生成构建系统，请从 build 目录运行 cmake .. 。第一步应指向顶级CMake文件。




2. 要构建（或编译）特定目标，说它是名为 MyExecutable1 ，运行以下命令：

     cmake --build。 --target MyExecutable1 
     

   来自 build 目录。您必须确保将-build 标志指向 build 文件夹，不这次是顶级CMake文件。另外，此命令中要指定的目标名称应与 add_executable（），非项目名称或其他任何名称中使用的目标名称相匹配。 / p>




3. 和往常一样，在尝试运行CMake时遇到错误/问题时，它有助于清除缓存（删除 build / CMakeCache.txt ），或者只是完全删除 build 文件夹并重新开始。

I have a CMake Project with roughly this structure:

.
|-- library1
|   |-- CMakeLists.txt
|-- library2
|   |-- CMakeLists.txt
|-- executables
|   |-- CMakeLists.txt

in executables i generate my 2 executables. I wonder if it was possible just generating one executable and its dependencies instead of all. I heard something about the cmake --target option but I cant get it to work with cmake/3.13.4.

解决方案

There are a couple potential issues here. First, the typical CMake workflow places the build folder as a sibling to the top-level CMake file. So your file hierarchy should look something like this:

.
|-- CMakeLists.txt
|-- library1
|   |-- CMakeLists.txt
|-- library2
|   |-- CMakeLists.txt
|-- executables
|   |-- CMakeLists.txt
|-- build    <------------ Run CMake commands from here.

This isolates all the CMake-generated files to the build folder. Secondly, you must to careful to run the CMake build stages in the proper location. We can run everything from within the build folder, for example:

1. To generate the build system, run cmake .. from the build directory. This first step should point to the top-level CMake file.

2. To build (or compile) a specific target, say it's called MyExecutable1, run this:

   cmake --build . --target MyExecutable1
   

   from the build directory. You must be sure to point the --build flag at the build folder, not the top-level CMake file this time. Also, the target name to specify in this command should match the target name used in add_executable(), not the project name or anything else.

3. As always, when getting errors/issues while attempting to run CMake, it helps to clear the cache (delete build/CMakeCache.txt), or just delete the build folder altogether and start fresh.

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