[CMake] add_custom_commmand TARGET is unknown

[Nils Gladitz]

On 16.04.2015 22:01, Daniel Dilts wrote:
> I have the following in my lists:
> if(TARGET CustomTarget)
>   message("TARGET CustomTarget")
> else()
>   message("NOT TARGET CustomTarget")
> endif()
> add_custom_command(TARGET CustomTarget PRE_BUILD
>   COMMAND CustomCommand.exe
>   USES_TERMINAL
>   )
>
> In my output I get:
> TARGET CustomTarget
> CMake Error at Some/Path/CMakeLists.txt:52 (add_custom_command
> ):
>   The target name "CustomTarget" is unknown in this context.
>
> It seems like the if() shows that there is a target with the desired 
> name.  Am I missing something?

You can only modify a target after it has been defined and in the 
directory (CMakeLists.txt) that defined it.
The same goes for appending commands to targets.

Nils