推迟自定义目标，直到安装 [英] Postpone making custom target until install

问题描述

我的项目中有这样的东西：

  add_custom_command（OUTPUT somefile）
 add_custom_target（tgt ALL DEPENDS somefile）
 
 install（FILES $ {CMAKE_CURRENT_BINARY_DIR} / somefile DESTINATION somedir）
  

这个工作正常，但我的命令是在 make 中运行，因为add_custom_target（）中的 ALL 关键字。我想要的是使CMake只有在 make install 时发出，而不是在构建期间运行此命令。

如果我删除ALL关键字，整个目标没有正在建设默认情况下，所以不生成somefile并且 make install 失败。

$ c>作为副作用。这可以通过使用 CODE 签名来完成.html＃command：installrel =nofollow> install 命令：

  add_custom_command（OUTPUT somefile）
 add_custom_target（tgt DEPENDS somefile）
 
 install（CODEexecute_process（COMMAND \$ {CMAKE_COMMAND} \--build \$ {CMAKE_CURRENT_BINARY_DIR} \--target tgt））
 install（FILES $ {CMAKE_CURRENT_BINARY_DIR} / somefile DESTINATION somedir）
  

execute_process 调用cmake以在之前创建目标 tgt

I have something like this in my project:

add_custom_command(OUTPUT somefile)
add_custom_target(tgt ALL DEPENDS somefile)

install(FILES ${CMAKE_CURRENT_BINARY_DIR}/somefile DESTINATION somedir)

This works OK, but my command is being run during make because of ALL keyword in add_custom_target(). What i want is to make CMake to run this command only when make install is issued, not during build.

If i remove ALL keyword, whole target is not being built by default, so somefile is not produced and make install fails.

解决方案

A possible solution is to have the make install command invoke the make tgt as a side effect. This can be done by using the CODE signature of the install command:

add_custom_command(OUTPUT somefile)
add_custom_target(tgt DEPENDS somefile)

install(CODE "execute_process(COMMAND \"${CMAKE_COMMAND}\" --build \"${CMAKE_CURRENT_BINARY_DIR}\" --target tgt)")
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/somefile DESTINATION somedir)

The execute_process invokes cmake to build the target tgt before somefile is installed.

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