[Qt-interest] [Qt-Interest] Visual Studio 2010 Compile of 64 bit Qt 4.7.1 Results in bad executables

[Thiago Macieira]

On Tuesday, 28 de December de 2010 16:48:25 Michael Jackson wrote:
> I don't want to start any type of argument, but let's pretend for a second
> that I don't actually know what each and every possible configuration option
> does and so I need to depend on the help from the "configure" script. So

Like Konrad said, if you don't know, don't change it.

> using "configure --help" I see the following:
> 
>     -graphicssystem <sys> Specify which graphicssystem should be used.
>                           Available values for <sys>:
>  *                         raster - Software rasterizer
>                            opengl - Using OpenGL acceleration, experimental!
> openvg - Using OpenVG acceleration, experimental!
> 
> Now, since I am creating a program that displays very large images (10k x
> 10k pixels) i certainly don't want the "raster - Software Rasterizer". The

See also his concerns. 10k * 10k = 100Mpx. At ARGB32, it's 400 MB *per* 
*copy*. You should really tile your work.

And you can access OpenGL directly too.

> Next option, "opengl" looks the best but the whole "this is experimental"
> scares me. After looking through some example code I got the idea that not

Now, the important thing here is that there are three options: raster, opengl 
and openvg. There aren't any other options on Windows -- not even native. And 
runtime is not an option.

> all Windows systems would have opengl available/enabled so some googling
> comes up with "-graphicssystem=runtime" with no context to tell me that it
> should be MeeGo/Symbian. Working with Visual Studio 2008 all works just

The fact that it wasn't an option should have been a clue. Anyway, you can use 
the runtime graphics system on Windows. You just can't configure it as the Qt 
default.

And it won't do anything, because there's nothing telling it to switch from 
raster to opengl and back, unlike on embedded devices.

>   What would have helped me forgo this "problem"? Maybe an update to the
> "configure" script to actually list the "runtime" option and how it is ONLY
> for MeeGo/Symbian. That much would have at least made me think twice before
> actually configuring Qt with that option on my own system.

You mean an update to add an option that is not an option? No. The configure 
output is fine: it lists the options that are available. You used something 
that isn't.

The configure program could validate what you write, though, against valid 
options. Currently it's a pass-through.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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