推迟自定义目标，直到安装

问题描述

我的项目中有这样的东西：

  $ c>作为副作用。这可以通过使用命令：
  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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