[Plplot-devel] A report that native-compiled solaris xwin segfaults for both plplot-5.0.4 and plplot-cvs

[Alan W. I. <ir...@be...>]

I have received a yplot report that the xwin driver segfaults under
particular circumstances whether built on top of plplot-5.0.4 or
plplot-latest-cvs.  This is on a solaris box using the native compiler to
build both yplot and plplot.  This user apparently employed the -xCC option
of the native solaris compiler to get around the c++-style commentary
issues in plplot.

I believe there is an excellent chance the problem is some subtle gcc-ism in
the xwin driver (both in 5.0.4 and cvs HEAD) that the native solaris
compiler is misinterpreting.  After all, the yorick (yplot) front end has a
quite simple and clean interface to c code (much less baggage than in the
python case), and this guy (who is quite reliable by the way) apparently
gets good results with the postscript drivers for exactly the same yplot
commands that segfault for the xwin driver.

Below, I have given this guy's words about the yplot code fragments that
bomb for him and work for him. I cannot pursue this further because I have
no access to a solaris box with X on it.  (The compile farm boxes at
sourceforge don't give access to X headers.) But if anybody else is
interested, I think the first step would be to attempt to replicate the
problem using the obvious C equivalent of the yplot commands below using the
native solaris compiler with -xCC option.  If the problem is found, then the
next step would be to see if it disappears if you use the gcc compiler under
solaris.

Alan

email: ir...@be...
phone: 250-727-2902	FAX: 250-721-7715
snail-mail:
Dr. Alan W. Irwin
Department of Physics and Astronomy,
University of Victoria, P.O. Box 3055,
Victoria, British Columbia, Canada, V8W 3P6
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Linux-powered astrophysics
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---------- Forwarded message ----------
Date: Sun, 21 Oct 2001 10:38:12 +0530 (IST)
From: V.V.Pipin <vp...@ii...>
To: Alan W. Irwin <ir...@be...>
Subject: Re: [Plplot-general] compiling yplot on the SunOS

....Besides this big success with installation yplot on the Sun mashine I
found that not all of plplot routines work correctly there.
Certainly there is a problem to put plot on xwin drive with combination
(only!, ps-drive and others work well)
plinit;
pladv,0;
plstick,1,1,1,1,4.,0.,2,0.;
plwind,0,1,0,1;

Though there was no problem to put plot on xwin with this
plinit;
pladv,0;
plenv,0,1,0,1, 0, 0;

In the first case I have
Enter device number or keyword: 1
ERROR (plinit) Segmentation violation interrupt (SIGSEGV)
  LINE: 61  FILE: /home/vpip/yorick/share/yorick/1.5/i0/yplot.i
yorick: quitting on error in batch mode.
The ps drive work well in this case, as I noted before.
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