[CMake] Properly Detecting Win64 - [Semi Off Topic Reply]

[David Cole]

But you've blown everything else away at that point, so the *build* is a
full rebuild, right?

CMake configure takes 60 seconds, but how long does the full build take?


On Wed, Apr 20, 2011 at 12:58 PM, Michael Jackson <
mike.jackson at bluequartz.net> wrote:

> Hey Dave,
>  So here are some timings for running CMake to the point where I can
> actually build my project. THe hardware is an Mac Pro 8 Core (16 Thread)
> 2.6GHz OS X 10.6.6 box also running Windows 7 x64. On OS X I use Makefiles
> in combination with Eclipse as the IDE so I generate straight Makefiles. On
> this system my project takes 10 seconds to configure to a point where it is
> ready to compile. On Windows using Visual Studio 9 2008 x64 as the generator
> this takes 58 seconds. When you are heavy into development where the CMake
> files are changing a bunch and there are lots and lots of runs of CMake then
> yes I thought I was taking a shortcut. Unfortunately this shortcut proved to
> have very bad side effects and now I don't do it any more. But still, 10
> seconds versus 60 Seconds can be a frustrating difference when deadlines are
> looming and you are needing to go faster.
>
> --
> Mike Jackson <www.bluequartz.net>
>
> On Apr 20, 2011, at 12:23 PM, David Cole wrote:
>
> >
> > In my opinion, blowing away everything except for the CMakeCache.txt file
> is asking for trouble, and puts you in an invalid (or at the very least,
> unexpected) state. Because some of the cached values may depend on some of
> the stuff that was just blown away. If you're blowing everything else away,
> why not blow away CMakeCache.txt, too? Is the CMake configure that high a
> percentage of your total build time that saving a few minutes on the whole
> makes it worth trouble like this?
> >
> > However, even so, I would like to understand and track down the source
> and the root cause of this trouble with CMAKE_SIZEOF_VOID_P -- because its
> correctness is arguably very important for many projects out there.
> >
> > So -- if somebody has a way to reproduce this without blowing away
> everything except for the CMakeCache.txt, I'd still like to hear it.
> >
> >
> > Thanks,
> > David
>
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