[Qt-interest] Minimal Qt/X11 compile

[Thiago Macieira]

Em Quarta-feira 06 Outubro 2010, às 08:34:57, Konrad Rosenbaum escreveu:
> On Wednesday 06 October 2010, Thiago Macieira wrote:
> > On Tuesday 5. October 2010 21.30.06 Konrad Rosenbaum wrote:
> [...] Thiago, thanks for the clarifications.
> 
> > > -reduce-relocations ..... Reduce relocations in the libraries
> > > 
> > > may reduce the time to start an app, may also make it a bit less stable
> > > (it's experimental)
> > 
> > Not experimental, highly recommended, should be default.
> 
> Then please correct the configure script ;-)

I will.

> > > -no-separate-debug-info . Do not store debug information in a separate
> > > file.
> > > 
> > > the inverse of a saver if you build with debug info - the shared object
> > > files become MUCH bigger; in -release mode you lose the ability to
> > > debug Qt
> > 
> > This is the inverse of the Qt 4.2-4.6 behaviour: the debug information is
> > no longer split out of the .so file by default. It simply remains where
> > it is.
> 
> Hmm. Strange, on my system it was split out in Qt 4.7.0. I used the
> defaults.

If you were using Git, you may be fooled by having older .debug files from 
older builds.

Unless something has changed again and it's no longer the default.

> > If you don't want it, you'll have to strip the binaries.
> 
> That is of course good advice anyway. Usually there is no need for any
> debug info in the final release binaries.

Indeed. But you should make available that debugging info, even if only to 
yourself, to debug crashes coming from your customers.

> > There's no loss
> > of functionality even in the debugger -- in fact, it may retain some,
> > since there are conditions when the separate debug info was wrong.
> 
> Under which conditions can this happen? As far as I know the library has
> the path-name of the separate debug info built in and the separate file
> contains exactly the same info that would have been in a different section
> of the same library file.

I am not certain of the details. Searching the Git commits that changed the 
default and following the links to the JIRA tasks related should reveal more.

Something to do with checksums.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
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