[Qt-interest] Qt on Linux

[Thiago Macieira]

On Friday 09 January 2009 13:11:32 Oliver.Knoll at comit.ch wrote:
> manish.s.sharma at nokia.com wrote on Friday, January 09, 2009 10:42 AM:
> > Hi,
> >
> > I have a installed Qt in Linux. I have installed Kdevelop as well. I
> > started debugging my test application and somewhere it is causing a
> > segmentation fault. But I am not able to get in to the source file of
> > Qt during debugging. It seems my program is hitting the release
> > version. Following the call stack:
> >
> >
> > #0 ??
> > /usr/lib/libQtCore.so.4 #1 ??
> >...
>
> Your program is hitting the release libraries because you linked against
> them (libQtCore.so)! The DEBUG Qt libraries contain a 'd' in their name
> (libQtCored.so), so there is no way your application could "accidentally"
> mix them up at runtime (depending on the LD_LIBRARY_PATH for example, which
> defines where to look for libraries basically).
>
> So make sure that your application links against the 'd' Qt libraries - I
> don't know KDevelop very well, but e.g. in Visual Studio you have a debug
> and release configuration where you explicitly set the libraries to link
> against.

Hi Oliver

That's not entirely correct.

On Windows, it's true that we add a 'd' to the library names, but the main 
reason for that is because the MSVC debug libraries are incompatible with the 
release ones. So we need a full set of incompatible debug.

On Mac, the suffix is '_debug' and, unlike Windows, it's fully binary-
compatible. You can set an environment variable and, at run-time, the dynamic 
linker will load the debug libraries.

On the other Unix, there is no suffix. The 'libQtCore.so.4' library could be 
either debug or release. There's no telling from the file name alone.

> @nokia? Can't you just knock on the next office door and ask for help now?
> ;)

Just checked the internal phonebook... Manish is a few thousand kilometres 
away.

-- 
Thiago Macieira - thiago.macieira (AT) nokia.com
  Senior Software Engineer - Nokia, Qt Software
  Qt Software is hiring - ask me
      Sandakerveien 116, NO-0402 Oslo, Norway
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