[CMake] [CMAKE] Getting compilation date through CMake

[Jakub Zakrzewski]

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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