[CMake] Correct way to make an arbitrary file trigger a reconfigure...

Tue Oct 15 08:54:44 EDT 2013

Kris,

I would use your configure_file construct if I had a reason to do this. It will work regardless of platform or CMake generator chosen... I would even go so far as to call it "the recommended way."

 HTH,
David

-----Original Message-----
From: Sergey Lekhanov <slekhano at gmail.com>
To: Kris Malfettone <kris.malfettone at sig.com>
Cc: Kris Malfettone <kris.malfettone at sig.com>; cmake <cmake at cmake.org>
Sent: Mon, Oct 14, 2013 9:30 pm
Subject: Re: [CMake] Correct way to make an arbitrary file trigger a	reconfigure...

Hi Kris,

I have done that by following:
1) use Ninja Generator;
2) include empty "rerun.cmake" file, I put this file into binary dir, so I need a patch;
3) add a patch to Ninja Generator to correctly write dependencies for "build.ninja" from included cmake files, if cmake file is in the binary directory;
4) add a custom commands that check the new files and touching "rerun.cmake" file;
5) once "rerun.cmake" file is touched ninja will rerun cmake;

Best regards,
Sergey
—
Sent from Mailbox for iPhone

On Tue, Oct 15, 2013 at 7:02 AM, Malfettone, Kris <Kris.Malfettone at sig.com> wrote:

Anyone?

From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org]On Behalf Of Malfettone, Kris
Sent: Thursday, October 03, 2013 8:43 AM
To: cmake at cmake.org
Subject: [CMake] Correct way to make an arbitrary file trigger a reconfigure...

Hi, I am trying to make cmake reconfigure whenever a certain file is touched.  This is because the file ends up listing out a set of directories that need to be built during the build.  Currently I do a trick where I use configure file to write out a file that will never be used but causes the input file to trigger reconfigures.
For example:

configure_file( file_i_care_about.txt ${CMAKE_CURRENT_BINARY_DIR}/tmp_file_that_isn’t_used.txt )

Is there another recommended way or is this the best approach.  I have tried searching for this but haven’t found anything on it yet.

-Kris

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