[Lazarus] Lazarus GTK project dependencies
nc-gaertnma at netcologne.de
Thu Apr 14 11:36:10 CEST 2011
michael.vancanneyt at wisa.be hat am 14. April 2011 um 10:17 geschrieben:
> On Thu, 14 Apr 2011, Mattias Gaertner wrote:
> > On Thu, 14 Apr 2011 09:47:57 +0200 (CEST)
> > michael.vancanneyt at wisa.be wrote:
> >> On Thu, 14 Apr 2011, zeljko wrote:
> >>> On Thursday 14 of April 2011 09:33:03 Michael Van Canneyt wrote:
> >>>> Hi,
> >>>> due to some other topic discussed on the mailing list, I thought I'd
> >>>> check
> >>>> the dependencies of a simple lazarus project. The result is shown below.
> >>>> I did this similar exercise a year or two ago, and the result has more
> >>>> than
> >>>> tripled !
> >>>> I wonder, why all these dependencies ??
> >>>> I mean, libselinux, libcairo, libexpat, libdirectfb, libfusion,
> >>>> libdirect
> >>>> (to name but a few), why do I need those ?
> >>> You don't but gtk does (or cairo or some xlib).
> >> Hm. I did a quick check:
> >> fsb: >ldd /usr/lib/libgdk-x11-2.0.so.0 | wc -l
> >> 44
> >> fsb: >ldd /usr/lib/libqt-mt.so.3.3.8 | wc -l
> >> 31
> >> So Qt needs 31 libs, GTK uses 44. Many of the extra ones related to direct
> >> framebuffer
> >> access, which is total nonsense in a X environment.
> > The gnome projects likes to split libs in smaller modules.
> > The number of libs is not that important. The size is more important:
> > A gtk2 program:
> > ldd testgtk2 | cut -d' ' -f 3 | grep lib | xargs cat | wc -c
> > 14932491
> > A qt program:
> > ldd testqt | cut -d' ' -f 3 | grep lib | xargs cat | wc -c
> > 53583219
> > So Qt uses about 50MB, GTK uses 15MB.
> I get quite a different count:
> fsb: >ldd /usr/lib/libqt-mt.so.3.3.8 | cut -d' ' -f 3 | xargs cat | wc -c
The libqt-mt library is only one lib of a qt program.
> fsb: >ldd /usr/lib/libgdk-x11-2.0.so.0 | cut -d' ' -f 3 | xargs cat | wc -c
And so is the libgdk of a gtk program.
> 7 vs. 9 Mb. Just for the Qt/Gtk library.
Please compare whole programs.
> And that only size matters is not quite correct: for each library the number
> of symbols in the libraries must be resolved.
> The more libraries must be resolved, the more work there is for the linker.
Since you gave no proof for this statement, I will answer with another
The bigger a library the more code, the more symbols must be resolved.
I don't know how to test the library loading time, but here are some timings of
minimal gtk2/qt programs:
> That was the main issue in KDE: to reduce the number of symbols to be
> resolved. This meant, less libraries.
I doubt that combining several libs into one accelerates much.
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