On 2016-11-16 08:58-0500 Hazen Babcock wrote: >> I also tried running it in gdb, where it did segfault with the following >> backtrace: >> >> (gdb) backtrace >> #0 0x00007fffedf1012d in gtk_container_add () from >> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 > .. >> #18 0x0000000000400e5c in main (argc=1, argv=0x7fffffffdf38) at >> /home/hbabcock/Code/plplot/examples/c/x02c.c:28 >> >> One thing that at least looks suspicious is frame #10: >> initQtApp (isGUI=true) >> >> Maybe isGUI should be false for the non-interactive devices? > > Never mind, I see that we have previously discussed isGUI and why it should > be true in 2010 in the thread: "tiffqt device hangs in test_noninteractive".
Sorry, still no time to do this myself, and your knowledge of the qt device driver is much better than mine in any case. However, the quick gdb tutorial for this situation (if you need one) is the following: Establish an important breakpoint with break initQtApp Then run (from the start) with run -dev pnqt -fam -o test.pngqt The when that breakpoint is hit, run the "cont" command to continue until you finally find the problematic call to initQtApp that generates the segfault. Count the number of times you have to continue, and then run again with one less continue and then look more carefully at the problematic call that ends in the segfault by stepping through the code after the breakpoint is reached with "next" and printing out all relevant variables until you reach the condition that causes that segfault. 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); the Time Ephemerides project (timeephem.sf.net); PLplot scientific plotting software package (plplot.sf.net); 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 __________________________ ------------------------------------------------------------------------------ _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
