CMake：将文件从源目录复制到二进制目录 [英] CMake: copy file from source directory to binary directory

问题描述

我试图在CLion上创建一个简单的项目。它使用CMake（我这里是新的）生成Makefiles构建项目（或某种类型）

所有我需要的是转移一些非项目文件

这个文件包含测试数据和应用程序打开它来读取它们。我尝试了几种方法：

• Via 档案（COPY ...

   档案（COPY $ {CMAKE_CURRENT_SOURCE_DIR} /input.txt 
   DESTINATION $ {CMAKE_CURRENT_BINARY_DIR} txt 
    

  看起来不错，但它只工作一次，下次运行后不重新复制文件。

  / li>
  

• Via add_custom_command

  
  
  
  
  

  • OUTPUT 版本

      add_custom_command（
     OUTPUT $ {CMAKE_CURRENT_BINARY_DIR} /input.txt 
     COMMAND $ {CMAKE_COMMAND} -E copy 
     $ {CMAKE_CURRENT_SOURCE_DIR} /input.txt 
     $ {CMAKE_CURRENT_BINARY_DIR} /input.txt）
      

  
  

  • TARGET 版本

      add_custom_target（foo）
     add_custom_command（
     TARGET foo 
     COMMAND $ {CMAKE_COMMAND} copy 
     $ {CMAKE_CURRENT_BINARY_DIR} / test / input.txt 
     $ {CMAKE_SOURCE_DIR}）
      

  
  
  
  $ b




我做错了什么？

解决方案

您可以考虑使用使用 COPYONLY 选项配置configure_file ：

  configure_file ; input> < output> COPYONLY）
  

与档案（COPY ...）不同它会在输入和输出之间创建文件级依赖关系，即：

如果输入文件被修改，构建系统将重新-run CMake重新配置文件并再次生成构建系统。

I'm trying to create a simple project on CLion. It uses CMake (I'm new here) to generate Makefiles to build project (or some sort of it)

All I need to is transfer some non-project file (some sort of resource file) to binary directory each time when I run the my code.

That file contains test data and application open it to read them. I tried several ways to do so:

• Via file(COPY ...

  file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/input.txt
          DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/input.txt
  

  Looking good but it work just once and not recopy file after next run.

• Via add_custom_command

  • OUTPUT version

    add_custom_command(
            OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/input.txt
            COMMAND ${CMAKE_COMMAND} -E copy
                    ${CMAKE_CURRENT_SOURCE_DIR}/input.txt
                    ${CMAKE_CURRENT_BINARY_DIR}/input.txt)
    

  • TARGET version

    add_custom_target(foo)
    add_custom_command(
            TARGET foo
            COMMAND ${CMAKE_COMMAND} copy
                    ${CMAKE_CURRENT_BINARY_DIR}/test/input.txt
                    ${CMAKE_SOURCE_DIR})
    

  But no one of it work.

What am I doing wrong?

解决方案

You may consider using configure_file with the COPYONLY option:

configure_file(<input> <output> COPYONLY)

Unlike file(COPY ...) it creates a file-level dependency between input and output, that is:

If the input file is modified the build system will re-run CMake to re-configure the file and generate the build system again.

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