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From: casper@fwi.uva.nl (Casper H.S. Dik)
Newsgroups: comp.windows.x
Subject: Re: Troubles with gcc 1.37.1 and mit/rgb
Message-ID: <1141@carol.fwi.uva.nl>
Date: 14 Jul 90 22:55:30 GMT
References: <9007131856.AA06628@genmri.sane.COM>
Sender: news@fwi.uva.nl
Reply-To: casper@fwi.uva.nl (Casper H.S. Dik)
Organization: Faculteit Wiskunde & Informatica, Universiteit van Amsterdam
Lines: 37

In article <9007131856.AA06628@genmri.sane.COM> doug@genmri.UUCP (Doug Becker) writes:
|I'm a novice at using gcc, and I'm having trouble with the rgb
|executable in the rgb subdirectory.  BEFORE YOU TUNE OUT, I HAVE read
|the latest "most frequently asked questions." :-)
|
|I'm getting a segmentation violation from rgb/rgb when I compile with
|gcc 1.37.1 on a Sun 4/280 running SunOS 4.0.3c (fixincludes WAS run).
|I'm running X11R4 through patchlevel 12. Here is a sample (some
|newlines inserted by the selection mechanism):
|
|genmri# pwd
|/home/X11/mit/rgb
|genmri# make clean
|rm -f rgb
|rm -f showrgb
|gcc -DNOSTDHDRS -fstrength-reduce -fpcc-struct-return -o showrgb showrgb.o -g
|  -ldbm
    ^^^^^ This is the tell tale sign.
|rm -f rgb.pag rgb.dir
|./rgb rgb < rgb.txt
|sh: 5904 Memory fault - core dumped
|*** Error code 139
|make: Fatal error: Command failed for target `rgb.dir'

There is a known incompatibility in the way functions returning
structures are handled between native gcc, pcc (gcc -fpcc-struct-return)
and Sun SPARC compilers. You try to combine CC compiled functions returning
structures (dbm*) with gcc compiled invocations. This doesn't work.

Use CC instead. In my experience, code generated by cc -O4 outperforms
gcc by sometimes as much as 25% on the SPARC.


--
Casper H.S. Dik				VCP/HIP: +31205922022
University of Amsterdam     |		casper@fwi.uva.nl
The Netherlands             |		casper%fwi.uva.nl@hp4nl.nluug.nl