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

问题描述

我正在尝试在 CLion 上创建一个简单的项目.它使用 CMake(我是新来的)来生成 Makefile 来构建项目(或某种项目)

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)

每次运行代码时，我只需要将一些非项目文件(某种资源文件)传输到二进制目录.

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.

该文件包含测试数据，应用程序打开它以读取它们.我尝试了几种方法:

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

• 通过 file(COPY ...

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

看起来不错，但它只工作一次，下次运行后不会重新复制文件.

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

通过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})

但没有一个有效.

我做错了什么?

推荐答案

您可以考虑使用 configure_file 带有 COPYONLY 选项:

You may consider using configure_file with the COPYONLY option:

configure_file(<input> <output> COPYONLY)

与 file(COPY ...) 不同的是，它在输入和输出之间创建了文件级的依赖关系，即:

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

如果输入文件被修改，构建系统将重新运行 CMake 以重新配置文件并再次生成构建系统.

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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