[CMake] FILE command in make_custom_target

[Philippe Fremy]

Brandon Van Every wrote:
> On 6/17/07, Philippe Fremy <phil at freehackers.org> wrote:
>>
>>         Hi,
>>
>> I want a directory to be built when a custom target is executed.
>>
>> I tried something like this:
>>
>>         add_custom_target(
>>                 doc_libyzis
>>                 COMMAND FILE( MAKE_DIRECTORY
>> ${CMAKE_CURRENT_SOURCE_DIR}/../apidoc )
> 
> COMMANDs for a custom target are not CMake commands.  They are
> commands you could run on a command line.

Yeah, I understood that now.

  You can't use FILE, you
> have to use a system-specific "mkdir" or some such.  You could write a
> CMake script with FILE in it, and then invoke the CMake script with
> "cmake -P", if you want something guaranteed to be portable.

It is ironic that a running cmake instance, that supports platform
agnostic directory creation, is not able to do that inside a rule and
has to fallback an calling a second cmake instance for that.

	cheers,

	Philippe