[CMake] [CMAKE] Getting compilation date through CMake

[Jon Haitz Legarreta]

BTW, just for other newbies, I think my mistake was that I took another
external command example literally:

EXECUTE_PROCESS(
  COMMAND
  svnversion -nc "${sourceDir}"
  OUTPUT_VARIABLE _out_svnversion
)

Now I guess the above works (without invoking the command prompt) because a
FindSubversion.cmake exists in CMake, and there is an svnversion.exe
somewhere in my SVN install.

HTH,
JON HAITZ



On 9 December 2013 08:53, Jon Haitz Legarreta <jhlegarreta at vicomtech.org>wrote:

> Dear Fraser and Matthew,
> yes, both approaches work. Thank you.
>
> There seems to be a trailing endline in the response given by
> $ENV{COMSPEC} /c date /t, so the following regex helps deleting it:
>
> STRING(REGEX REPLACE "(\r?\n)+$" "" _date "${_date}")
>
> Thanks again,
> JON HAITZ
>
>
>
>
> On 5 December 2013 22:34, Matthew Woehlke <matthew.woehlke at kitware.com>wrote:
>
>> On 2013-12-05 15:46, Fraser Hutchison wrote:
>>
>>> If you can specify CMake version 2.8.11 as a minimum, you could use
>>> the string(TIMESTAMP ...) command instead:
>>>
>>> string(TIMESTAMP _output "%d/%m/%Y")
>>>
>>> Bear in mind that these only execute when CMake runs (i.e. at configure
>>> time)
>>> rather than at build time, so strictly-speaking you're not actually
>>> grabbing the
>>> compile date.
>>>
>>
>> Of course you could put that in a CMake script and execute it with e.g.
>> '${CMAKE_COMMAND} -p ${CMAKE_CURRENT_SOURCE_DIR}/get_date.cmake' in a
>> custom command :-). Then it would truly be the compile date. (Needless to
>> say, the script would need to write the date into some generated source
>> file, e.g. with configure_file.)
>>
>> --
>> Matthew
>>
>>
>> --
>>
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