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:[email protected]] On Behalf Of abid rahman Sent: Montag, 30. Juni 2014 13:14 To: Nils Gladitz Cc: [email protected] 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 <[email protected]<mailto:[email protected]>> 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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