Re: Possible compilation error in QtGraphicsScene.h

[Daniel J S. <dan...@ie...>]

On 02/16/2014 11:46 AM, Daniel J Sebald wrote:
> In the file QtGraphicsScene.h is:
>
> #define EAM_BOXED_TEXT 1
>
> Should that be there?  It seems it could override the settings of
> config.h.  Or doesn't it make a difference because the terminal will
> just be including something that doesn't get used?

Oh, I just realized why that is there.  It is to provide the signal/slot 
definitions for the moc_### files.  At least it was at one time, 
perhaps.  When Qt does it's pre-processing, it isn't including config.h 
apparently and acting accordingly.  It just looks for the "signals" and 
"slots" directives.

Hmm, I suppose one solution is to not worry about defining out signals 
and slots in Qt header files.  That is leave out the #ifdef in the 
following:

signals:
#ifdef EAM_BOXED_TEXT
     void sig_boxed_text(unsigned int x, unsigned int y, int option);
#endif

At this link is described another way of getting definitions in the MOC 
compilation:

http://qt-project.org/doc/qt-4.8/moc.html

  moc_%.cpp: %.h
          moc $(DEFINES) $(INCPATH) $< -o $@

but of course DEFINES has to hold something.

I'm not going to worry about this and just go with leaving out the 
#ifdef in signals/slots.

Dan