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

问题描述

我想有任何的CMake运行三个命令的bash或者bash脚本。不过，我似乎无法得到它的工作。

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.

bash的命令是：

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

从本质上讲，我想CMake的建库在该目录中，如果它不存在。

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

这里的CMake的code我尝试：

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")

然而，这不是什么建设。我究竟做错了什么？

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

此外，虽然我在这里问这个？应在第三命令，移动到文件夹的二进制文件，包括

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

谢谢！

推荐答案

<一个href=\"http://www.cmake.org/cmake/help/v3.0/command/execute_process.html\"><$c$c>execute_process()期间配置的时间执行。但你希望在构建时运行，因此<一个href=\"http://www.cmake.org/cmake/help/v3.0/command/add_custom_command.html\"><$c$c>add_custom_command()和<一个href=\"http://www.cmake.org/cmake/help/v3.0/command/add_custom_target.html\"><$c$c>add_custom_target()就是你在寻找什么。

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.

在这种特殊情况下要生成一个输出文件，所以你应该去为 add_custom_command（）（两者在本质上是相同的，但命令产生一个或多个输出文件，而目标没有。​​

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.

此CMake的片段应该类似于以下内容：

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

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

您接下来要添加输出文件的另一个目标为相关性，预期一切都应该（希望）工作。

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

您还可以添加 DEPENDS 语句到 add_custom_command（）调用重建目标文件的情况下，一些输入来源已经改变了。

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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