[CMake] Passing empty arguments to add_custom_command

[Petr Kmoch]

I think it should work if you put quotes around the expansion - otherwise,
an empty variable expands to nothing, not to an empty string:


*add_custom_command(*

*    OUTPUT ${some_files}*

*    COMMAND ${PYTHON_EXECUTABLE} test.py "${prefix}" ${src} ${dst}*
*    DEPENDS ${....... all deps ......} )*

Petr


On Mon, Jun 30, 2014 at 1:13 PM, abid rahman <abidrahman2 at gmail.com> wrote:

> Thank you Nils, VERBATIM really worked for me as shown below:
>
>
> *add_custom_command(*
>
> *    OUTPUT ${some_files}*
>
> *    COMMAND ${PYTHON_EXECUTABLE} test.py "" ${src} ${dst} *
>
> *    DEPENDS ${....... all deps ......}*
> *    VERBATIM )*
>
> But now got a new question. I tried setting a variable and passing it, but
> it didn't work. as shown below:
>
>
>
> *set(prefix "")add_custom_command(*
>
> *    OUTPUT ${some_files}*
>
> *    COMMAND ${PYTHON_EXECUTABLE} test.py ${prefix} ${src} ${dst}*
> *    DEPENDS ${....... all deps ......} )*
>
> Any idea why?
>
> Abid K.
>
>
> On Mon, Jun 30, 2014 at 1:35 PM, Nils Gladitz <nilsgladitz at gmail.com>
> wrote:
>
>> On 06/30/2014 09:42 AM, abid rahman wrote:
>>
>>> Hello,
>>>
>>> I need to execute following  command with add_custom_command:
>>> *python test.py "" src dst*
>>>
>>>
>>> The first argument is empty. Sometimes it may have some text. So Python
>>> process the args as [test.py, "", src, dst]. But when I do the same with
>>> add_custom_command, the empty argument is not considered, instead src is
>>> considered as second argument.
>>>
>>> I did it as follows:
>>>
>>> *add_custom_command(
>>> *
>>> *    OUTPUT ${some_files}
>>> *
>>> *    COMMAND ${PYTHON_EXECUTABLE} test.py "" ${src} ${dst}
>>> *
>>> *    DEPENDS ${....... all deps ......} )*
>>>
>>>
>>> So what is the best method to pass empty arguments to cmake
>>> add_custom_command?
>>> Abid K.
>>>
>>
>> Try adding VERBATIM.
>>
>> Nils
>>
>>
>
> --
>
> Powered by www.kitware.com
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Kitware offers various services to support the CMake community. For more
> information on each offering, please visit:
>
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
> CMake Training Courses: http://cmake.org/cmake/help/training.html
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/cmake
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/cmake/attachments/20140630/93985079/attachment.html>