If you want to put the content of example into install folder after build:

code/
  src/
  example/
  CMakeLists.txt

try add the following to your CMakeLists.txt:

install(DIRECTORY example/ DESTINATION example)

Single File

1. Add a rule for the copying. OUTPUT specifies the produced file and DEPENDS creates a dependency, so when the input changes this rule is run again.

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

2. Then add the result file as a dependency to the target that needs it.

add_executable(main_executable
    ${CMAKE_CURRENT_BINARY_DIR}/${MY_RESOURCE_FILE}

    src/main.cpp
)

amodern and Clean CMake解决方案,因为所有附属企业都是以目标为基础,并根据需要推广依赖树木。 我们没有改变任何全球状态。 档案本身也跟踪,因此只有在档案过期时才能复制。 这也是一个有力和有效的解决办法。

In case its needed by multiple targets, add them to all of them. This is good practice, as dependencies are explicitly specified, exactly where they are needed.

Multiple Files

As some people here asked for copying multiple files, I am adding this here as well, as a few more things need to be considered.

界定档案有两种可能性,一种可以人工列出,类似于上文。 或者,我们可以制定自动发现的<条码>glob规则。 第一种是非常直截了当的,使用相对的路向CMAKE_CURRENT_SOURCE_DIR。

set(MY_RESOURCE_FILES 
    resources/font.ttf
    resources/icon.svg
)

I am also showing the second glob case, at requires a bit more consideration.

file(GLOB_RECURSE
    MY_RESOURCE_FILES
    RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} 
    CONFIGURE_DEPENDS

    ${CMAKE_CURRENT_SOURCE_DIR}/resources/**.ttf    # adapt these to your needs
    ${CMAKE_CURRENT_SOURCE_DIR}/resources/**.svg
)

Specifying CONFIGURE_DEPENDS re-runs the glob at the beginning the build when any target is out-of date. And RELATIVE gives us relative path to our source directory. And using two stars **.svg recursively searches all sub-directories as well.

现在,我们再次制定一条单独的规则,使每项资源都存档。

FOREACH(MY_RESOURCE_FILE ${MY_RESOURCE_FILES})
    add_custom_command(
        OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${MY_RESOURCE_FILE}
        COMMAND ${CMAKE_COMMAND} -E copy
            ${CMAKE_CURRENT_SOURCE_DIR}/${MY_RESOURCE_FILE}
            ${CMAKE_CURRENT_BINARY_DIR}/${MY_RESOURCE_FILE}
        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${MY_RESOURCE_FILE}
  )
ENDFOREACH()

This will also make it that only the resources missing or changed are copied.

最后,我们把所有这些内容补充到我们可执行的行动中。 为此,我们刚刚需要调整这条道路,使之适应双亲。

list(TRANSFORM MY_RESOURCE_FILES PREPEND ${CMAKE_CURRENT_BINARY_DIR}/)

add_executable(${MAIN_TARGET} 
    ${MY_RESOURCE_FILES}

    src/main.cpp
)