[CMake] Re: CMake script return a value

[Brandon J. Van Every]

Brad King wrote:
> Brandon J. Van Every wrote:
>   
>> Brandon J. Van Every wrote:
>>     
>>> Can a CMake script invoked with
>>>
>>> EXECUTE_PROCESS(
>>>  COMMAND ${CMAKE_COMMAND} -P myscript.cmake
>>>  RESULT_VARIABLE myresult
>>> )
>>>
>>> return a value?  I don't really want to use stdout.  I need that for
>>> status messages.  I could regex the stdout to extract a decorated
>>> string, but that's bletcherous.  What I want is to do something like
>>> RETURN(${value}) and have RESULT_VARIABLE pick it up.
>>>       
>> I realized a further problem, that ADD_CUSTOM_COMMAND and
>> ADD_CUSTOM_TARGET can't have EXECUTE_PROCESS in them.  They can only
>> call scripts, and the scripts do not return values.  So, there's no way
>> to directly return a value from a script to a build rule.
>>     
>
> If you just need to know whether there was an error, have the script
> exit with MESSAGE(FATAL_ERROR ...) in the error case.

No I wanted a value.


>   Otherwise you can
> add a feature request for an EXIT command or something like it.  There
> is actually no reason that the same set of commands needs to be
> available in project mode and script mode, so we could just add
> scripting-specific commands like EXIT when needed.
>   

Hmm, true.  Ok I'll add a feature request.  There are actually 2 
requests: an EXIT(value) that other CMake scripts can pick up, and a way 
to retain state between COMMANDs in an ADD_CUSTOM_COMMAND that does not 
require writing files.


Cheers,
Brandon Van Every

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