Re: [Mingw-cross-env-list] Unneeded Qt dependency

[Nikos Chantziaras]

On 06/28/2011 10:57 PM, Mark Brand wrote:
> > In the *.pro file:
> >
> > QTPLUGIN += qcncodecs qjpcodecs qtwcodecs qkrcodecs
> >
> > And somewhere in the program sources:
> >
> > #include <QtPlugin>
> > Q_IMPORT_PLUGIN(qcncodecs)
> > Q_IMPORT_PLUGIN(qjpcodecs)
> > Q_IMPORT_PLUGIN(qtwcodecs)
> > Q_IMPORT_PLUGIN(qkrcodecs)
>
> But I'm wondering about alternatives:
>
> Maybe there is a way to make Qt to use iconv even on Windows.

Qt does not use iconv for charset conversions even on Unix, actually. 
At least not for all of them.  It only uses it for the current Unix 
locale.  On Windows, there isn't a "current Unix locale".  So there is 
no use for it.

I didn't look at the Qt sources myself, but I trust that Thiago 
Macieira, one of Nokia's Qt lead devs, knows what he's talking about :-P


> Also, do you have a minimal example showing where a text conversion only
> works when with -no-iconv?

I've rebuilt everything with vanilla mingw-cross-env in order to test 
properly (my version is *heavily* modified, including patches (even for 
modifying binutils to do dead-code stripping) and lots of configuration 
changes.)  It seems it works just fine even without -no-iconv.  So the 
non-working QTextCodec does not appear with default mingw-cross-env.

However, I cannot explain why.  The docs clearly mention that to use the 
charset conversion plugins in static builds, you have to explicitly 
include them.  Why they work regardless if you build with '-iconv" is a 
mystery to me, since iconv is not actually used for anything on Windows.