[Octave-bug-tracker] [bug #40252] Make GUI compatible with both Qt4 and Qt5

[Dmitri A. Sergatskov]

Follow-up Comment #30, bug #40252 (project octave):

Here is my findings sofar:

-- Qt5/Qt4 linking was due to octave-4.0.3 installed system-wide.


 ldd src/.libs/octave-gui | grep octave
        liboctgui.so.1 => /usr/lib64/octave/4.0.3/liboctgui.so.1
(0x00007fdd4182e000)
        liboctinterp.so.3 => /usr/lib64/octave/4.0.3/liboctinterp.so.3
(0x00007fdd404a6000)
        liboctave.so.3 => /usr/lib64/octave/4.0.3/liboctave.so.3
(0x00007fdd3db57000)

since it linked to Qt4 it pulls those Qt4 links in. If I remove octave from
the system, the Qt4 links dissapear as well. In any case those do not seems to
affect anything.

-- clipping fonts in command history window appears to be an issue with Qt5
and cleartype fonts. If I change the fonts to TT (systemwide), the problem
disappear. 
Not sure if this is a problem with octave or Qt5. octave-gui compiled against
Qt4 can handle both ClearType and TrueType.

-- On Fedora, the name of Qt5-linked qscintilla library is 
libqscintilla2-qt5.so. Configure does not find it. I had to make 
symlink to libqt5scintilla.so. Agin not sure if there are naming conventions
and is this an octave or fedora issue.

Dmitri.
-- 


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