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From: dwho@jupiter.nmt.edu (David Olix)
Newsgroups: comp.sys.hp
Subject: Optimizer bug in cc(1) on HP9000/835
Keywords: Internal error
Message-ID: <1990Sep19.210628.10847@nmt.edu>
Date: 19 Sep 90 21:06:28 GMT
Sender: dwho@nmt.edu (David Olix)
Organization: New Mexico Institute of Mining and Technology
Lines: 41

Since I can't seem to be able to report bugs to the Software Support
folks until we get our "official" ID number I figured I'd post this
here so everyone (hopefully at least someone at HP) will see....

Problem:     Optimizer bug in cc(1).
System:      HP9000/835 running HP-UX 7.0
Compiler ID: HP92453-01 A.07.10 HP C Compiler

Oversimplified description:
% cat ccbug.c
main()
{
  char *p;
  int i;

  i = 0;
  *(p = i - i);
}
% cc -v -O ccbug.c
/lib/cpp ccbug.c /tmp/ctmAAAa20274 -D__hp9000s800 -D__hppa -D__hpux -D__unix  
cc: Entering Preprocessor.
/lib/ccom /tmp/ctmAAAa20274 ccbug.o -O2 -v -Ac 
cc: Entering Scanner and Parser.
cc: Entering Semantic Analyzer.
cc: Entering Aliaser.
cc: Internal error 3277: Investigation required - Please contact HP Support.
%

I was also able to purturb internal errors 3265 and 3267 by using variants
of the above with the ternary operator.  Basically, I think it has something
to do with an incorrect implicit int --> char * conversion.  I know the C
program tries to dereference a NULL pointer, but that's not the point....


--David Olix                           |   And I *still* hate the Simpsons,
--dwho@{minos|jupiter|nmtvax}.nmt.edu  |   but I wanted a short .sig
-- 
Bulky and offensive .sig follows...

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