On 2009-09-03 10:07-0400 Hazen Babcock wrote: >> On Sun, Aug 30, 2009 at 11:23 AM, Hazen Babcock<hbabc...@mac.com> wrote: >>> In the process of investigating cmap issues Alan and Werner were >>> discussing I have found that the xcairo driver no longer works on my >>> PowerPC OS-X box, and instead fails with a "Bus error". The other cairo >>> drivers such as the ps and png drivers work fine.
> [...]it turns out it is has nothing to do with [...]recent changes. I've > seen this problem before on OS-X but since I don't use my mac much these > days for dev work I had forgotten about it. Basically, with some > drivers, if you try and specify them at the command prompt with > "./example/x -dev driverx" then they will give a bus error. However, if > you just run "./example/x" and the choose the driver from the list > everything works. Hi Hazen: It sounds like you have discovered (or rediscovered) an issue in the command-line parsing code on your OS X platform. Could you remind us again of exactly what hardware that is (32-bit or 64-bit, PowerPC or Intel)? I looked up bus error at http://en.wikipedia.org/wiki/Bus_error, and it appears to have two general causes. The first of those seems closely related to segfaults and memory management and the second of these has to do with memory alignment (which might be screwed up in the command-line parsing code for big-endian architectures like PowerPC, but not little-endian architectures like Intel). Generally with all such errors I suggest you use valgrind to help figure things out. So do you get valgrind error reports for all command-line options or just -dev.? If just -dev, is it for all devices or just the ones that produce bus errors? 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 __________________________ ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
