[CMake] Passing empty arguments to add_custom_command

abid rahman abidrahman2 at gmail.com
Mon Jun 30 07:32:24 EDT 2014


OK, I think It is better to stick to my first option. That looks better.

Thank you for all your suggestions.

Abid K.


On Mon, Jun 30, 2014 at 4:56 PM, Jakub Zakrzewski <jzakrzewski at e2e.ch>
wrote:

>  That's because now you've set prefix to empty string and it'll be
> expanded to nothing. VERBATIM made the empty quotes appear because they
> were put directly as parameter.
>
>
>
> I think if you set(prefix "\"\"") it'll do the trick.
>
>
>
> *From:* CMake [mailto:cmake-bounces at cmake.org] *On Behalf Of *abid rahman
> *Sent:* Montag, 30. Juni 2014 13:14
> *To:* Nils Gladitz
> *Cc:* cmake at cmake.org
> *Subject:* Re: [CMake] Passing empty arguments to add_custom_command
>
>
>
> 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
>
>
>
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