[CMake] [CMAKE] Getting compilation date through CMake

[Jon Haitz Legarreta]

Thanks for the tip Jakub.

BTW, I just realized that the

[OUTPUT_STRIP_TRAILING_WHITESPACE]

option of EXECUTE_PROCESS has the same effect of the regex I wrote to strip
the trailing linebreaks.

Regards,
JON HAITZ


On 9 December 2013 09:46, Jakub Zakrzewski <jzakrzewski at e2e.ch> wrote:

> Hi,
> I only wanted to warn you, that windows "date" command output is
> locale-specific, so you may get into trouble if you want to use it as
> anything else than a string literal.
>
> From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf
> Of Jon Haitz Legarreta
> Sent: Montag, 9. Dezember 2013 09:01
> To: Matthew Woehlke
> Cc: cmake at cmake.org
> Subject: Re: [CMake] [CMAKE] Getting compilation date through CMake
>
> 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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