-----Original Message-----
From: Tobias Hunger <[email protected]>
Date: Wednesday, September 27, 2017 at 6:11 PM
To: Michael Jackson <[email protected]>
Cc: qt-creator <[email protected]>
Subject: Re: [Qt-creator] QtCreator 4.3/4.4 + CMake likes to "rebuild" my
project, a lot.
Hi Michael,
On Wed, Sep 27, 2017 at 3:58 PM, Michael Jackson
<[email protected]> wrote:
> I have seen this problem more than a few times and with a 45 minute build
time for our project it is starting to get in the way. Our project is CMake
based (I am using CMake 3.8 or 3.9 depending on the particular workstation that
I am using at the time) and also uses Qt 5.9.1 64 bit. All the code is C++.
What will happen is that I load the project, QtCreator properly configures for
the build (Debug) and I build the project successfully. I quit QtCreator.
Relaunch QtCreator and when I click Debug for our application QtCreator will
pretty much rebuild the entire project. NOTHING changed between when I last
built, quit QtCreator and relaunched QtCreator. I use ninja as the build tool.
When you open the project, then cmake will go through the
configure/generate steps again. Is that what you are referring to?
That is how cmake wants this to be handled, so there is nothing I can
do there.
Or does the actual build rebuild huge parts of the project? That could
be triggered by cmake configur/generate mentioned above: Do you create
some central header file or something from cmake? That would be a bug
that I'd need to file with upstream cmake:-/
Best Regards,
Tobias
Tobias,
Figured it out! When you change versions of CMake in the "Kits" QtCreator
will re-run CMake with that changed version BUT it looks like QtCreator deletes
the current CMakeCache.txt file and completely starts over which will basically
force a mostly clean build. If I change versions of CMake on the command line
the current CMakeCache.txt file is used and I don't get the "rebuild" issue.
So is there an explicit piece of code in QtCreator that deletes the
CMakeCache.txt when the version of CMake is changed in the Kits? Is this the
recommended thing to do from the CMake Devs?
Thanks
Mike Jackson
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