[CMake] How to install custom target

[Alex Turbov]

Hi list,

What is the "right" way to install a custom target, when you don't know the
result file name?
E.g. I have a sample project:

cmake_minimum_required(VERSION 3.9)
project(custom_target)

add_custom_target(
    log ALL
    COMMAND ${CMAKE_COMMAND} -E environment > sample-$<CONFIG>.log
  )
# install(... ??? ...)

In a multi-configuration build, how can I get the resulting filename to use
`install(FILES...)` (as it recommended by CMake wiki) ??

Or is there any other way to use `install()` (maybe `TARGETS`...) ?

Best,
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