[CMake] Copying target output file to another directory

[Robert Dailey]

This is part of a lot of complex logic to integrate ANT into CMake as
transparently as possible to assist in integrating Android support
(building Java and APK). So I do not use INSTALL targets. This is an
implementation detail since the libs are required in a specific
directory so that ANT can package them into the APK for distribution
to Android devices.

On Tue, Jul 18, 2017 at 10:54 AM, Robert Maynard
<robert.maynard at kitware.com> wrote:
> Question: Is there a specific reason why you don't want to do this as
> part of the install step?
>
> If this can't be done at install time, you can look at using
> add_custom_command Generating File signature with a target dependency
> on ${target}
>
> On Tue, Jul 18, 2017 at 10:44 AM, Robert Dailey
> <rcdailey.lists at gmail.com> wrote:
>> So I need to copy the output *.so from a target to an arbitrary
>> directory outside the CMAKE_BINARY_DIR. I tried doing this as a post
>> build event using generator expressions:
>>
>> add_custom_command(
>>     TARGET ${target} POST_BUILD VERBATIM
>>     COMMAND ${CMAKE_COMMAND} -E copy "$<TARGET_FILE:${target}>" ${dir}
>> )
>>
>> This fails because I'm running it outside of the directory where
>> ${target} is defined:
>>
>> CMake Error at Core/CMake/third-party.cmake:86 (add_custom_command):
>>   TARGET 'MagickCore' was not created in this directory.
>>
>>
>> How can I do this without moving my add_custom_command() to the same
>> directory that created the target? I need to add all the custom
>> commands at the end of generation because it depends on certain global
>> properties which are not completely done being set until the very end.
>> --
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