通过 CMake 运行 bash 命令 [英] Running a bash command via CMake

问题描述

我正在尝试让 CMake 运行三个 bash 命令或一个 bash 脚本.但是，我似乎无法让它工作.

bash 命令是:

 cd ${CMAKE_SOURCE_DIR}/dependencies/library制作cd ${CMAKE_BINARY_DIR}

本质上，如果该目录不存在，我希望 CMake 在该目录中构建该库.

这是我尝试过的 CMake 代码:

if(NOT "${CMAKE_SOURCE_DIR}/dependencies/library/lib.o")执行进程(命令 cd ${CMAKE_SOURCE_DIR}/dependencies/library)执行进程(命令生成)执行进程(命令 cd ${CMAKE_BINARY_DIR})endif(NOT "${CMAKE_SOURCE_DIR}/dependencies/library/lib.o")

但是，它没有构建任何东西.我究竟做错了什么?

另外，当我在这里问这个问题时:是否应该包含第三个命令来移动到二进制文件夹?

谢谢！

解决方案

execute_process() 在配置期间执行.但是您希望它在构建时运行，因此 add_custom_command() 和 add_custom_target() 就是你要找的.

在这种特殊情况下，您想生成一个输出文件，因此您应该使用 add_custom_command() (两者本质上是相同的，但 command 会产生一个或多个输出文件，而 target 没有.

为此的 cmake 代码段应如下所示:

add_custom_command(输出 ${CMAKE_SOURCE_DIR}/dependencies/library/lib.oWORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/dependencies/library命令使)

然后，您必须将输出文件作为依赖项添加到另一个目标中，并且一切都应该(希望)按预期工作.

您还可以将 DEPENDS 语句添加到 add_custom_command() 调用中，以在某些输入源发生更改的情况下重建目标文件.

I'm trying to have CMake either run three bash commands or a bash script. However, I can't seem to get it to work.

The bash commands are:

    cd ${CMAKE_SOURCE_DIR}/dependencies/library
    make
    cd ${CMAKE_BINARY_DIR}

Essentially, I would like CMake to build the library in that directory if it does not already exist.

Here's the CMake code I tried:

if(NOT "${CMAKE_SOURCE_DIR}/dependencies/library/lib.o")
   execute_process(COMMAND cd ${CMAKE_SOURCE_DIR}/dependencies/library)
   execute_process(COMMAND make)
   execute_process(COMMAND cd ${CMAKE_BINARY_DIR})
endif(NOT "${CMAKE_SOURCE_DIR}/dependencies/library/lib.o")

However, it's not building anything. What am I doing wrong?

Also, while I'm here asking this: should the third command, to move to the binary folder, be included?

Thanks!

解决方案

execute_process() is executed during configure time. But you want this to run at build time, thus add_custom_command() and add_custom_target() is what you're looking for.

In this special case you want to generate an output file, so you should go for add_custom_command() (both are essentially the same, but command produces one or multiple output files, while target does not.

The cmake snippet for this should look something like the following:

add_custom_command(
    OUTPUT ${CMAKE_SOURCE_DIR}/dependencies/library/lib.o
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/dependencies/library
    COMMAND make
)

You then have to add the output file in another target as dependency, and everything should (hopefully) work as expected.

You can also add DEPENDS statements to the add_custom_command() call to rebuild the object file in case some input sources have changed.

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