SigCount assertion error when used with ferret-vis

[Mike Neish]

When I try to do a "shade" plot from the ferret_c program (in ferret-vis_6.6.2-1), the program crashes during a call to the xgks library, with the message:
ferret_c: xevent.c:324: xProcessEvents: Assertion `SigCount > 0' failed.
Aborted (core dumped)

The ferret-vis source package ships with its own version of xgks (deprecated in favour of this system-wide xgks package). I noticed in the source of the ferret-vis version, someone had explicitly changed the assertion (I'm guessing to work around the same issue I'm having?):
    void
xProcessEvents()
{
    assert(SigCount > 0);
/* acm acm 9/12/2007 */
/* assert(SigCount > 0); */ <------
    assert(SigCount >= 0);
    ProcessEvents();
}

Applying this change to libxgks2 fixes the crash in ferret_c. I've attached a patch with the relevant changes.

Caveat: I'm treating this entire package as a black box, so I have no idea if this change will cause side-effects in other packages that use xgks.

$ lsb_release -rd
Description: Ubuntu 12.04.3 LTS
Release: 12.04

$ apt-cache policy libxgks2
libxgks2:
  Installed: 2.6.1-3
  Candidate: 2.6.1-3
  Version table:
 *** 2.6.1-3 0
        500 http://ca.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages
        100 /var/lib/dpkg/status

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "Patch to fix SigCount error when using xgks with ferret-vis" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]