Hi Andrew: I have changed the subject line appropriately.
On 2009-07-20 15:55+0100 Andrew Ross wrote: > Slightly off topic - I've now got gcc -fvisibility=hidden working with > the qt driver and with the C++ qt_example.cpp. It does not work with > the pyqt4 bindings yet. There are a couple of issues here (I think). > 1) The sip generated code does not export the symbols that python > requires. It should be possible to massage the source code if required. > 2) The moc generated code for qt also is not visibility aware and I > think this is what is leading to the missing symbols in plplot_pyqt4.so > at the moment. I've not yet worked out how (or indeed even if it is > possible) to massage the code by hand to "fix" this. Thanks very much for dealing with the visibility issues caused by splitting the old qt.cpp source code into qt.cpp and plqt.cpp. I have now added one additional cleanup there (revision 10167) to remove some unneeded logic in pldll.h.in. I agree with your comment (1) above that the visibility of the symbols defined in plplot_pyqt4.so will be an issue when python attempts to dynamically load that shared object. But I believe the first priority is to deal with the remaining unexported symbols in libplplotqtd.so that are causing undefined symbols for plplot_pyqt4.so. The current undefined symbol status is as follows. softw...@raven> ldd -r drivers/qt.so 2>&1 |grep undefined softw...@raven> ldd -r bindings/qt_gui/libplplotqtd.so 2>&1 |grep undefined softw...@raven> ldd -r bindings/qt_gui/pyqt4/plplot_pyqt4.so 2>&1 |grep undefined undefined symbol: _ZTI11QtExtWidget (bindings/qt_gui/pyqt4/plplot_pyqt4.so) undefined symbol: _ZTI10QtPLWidget (bindings/qt_gui/pyqt4/plplot_pyqt4.so) undefined symbol: _ZN11QtExtWidget16staticMetaObjectE (bindings/qt_gui/pyqt4/plplot_pyqt4.so) undefined symbol: _ZN10QtPLWidget16staticMetaObjectE (bindings/qt_gui/pyqt4/plplot_pyqt4.so) undefined symbol: _ZN10QtPLWidget11qt_metacastEPKc (bindings/qt_gui/pyqt4/plplot_pyqt4.so) undefined symbol: _ZN11QtExtWidget11qt_metacallEN11QMetaObject4CallEiPPv(bindings/qt_gui/pyqt4/plplot_pyqt4.so) undefined symbol: _ZN10QtPLWidget11qt_metacallEN11QMetaObject4CallEiPPv (bindings/qt_gui/pyqt4/plplot_pyqt4.so) undefined symbol: _ZN11QtExtWidget11qt_metacastEPKc (bindings/qt_gui/pyqt4/plplot_pyqt4.so) I have double-checked that all these eight symbols are defined in but not exported from libplplotqtd. You are probably aware of this already, but I just discovered you can correlate these symbols with the demangled symbols using the appropriate nm options and grep. For example: softw...@raven> nm --defined-only bindings/qt_gui/libplplotqtd.so |grep _ZTI11QtExtWidget 0000000000214b50 d _ZTI11QtExtWidget softw...@raven> nm --defined-only --demangle bindings/qt_gui/libplplotqtd.so |grep 0000000000214b50 0000000000214b50 d typeinfo for QtExtWidget That demangled symbol information for all eight symbols may help you to figure out what is really going on with visibility. I am curious about your comment (2) above. Is there an example of a externally required symbol in the generated moc_qt.cxx that cannot be exported by some qt.h change involving the PLDLLIMPEXP_QT macro? Alan __________________________ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); PLplot scientific plotting software package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________ ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
