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From: | Robert Ruehlmann <rr9 AT angband DOT org> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Compiler optimization bug |
Date: | 12 Dec 1999 14:17:38 GMT |
Organization: | The Pits of Angband |
Lines: | 28 |
Message-ID: | <830aq2$68s$1@news-int.gatech.edu> |
NNTP-Posting-Host: | r38h184.res.gatech.edu |
X-Trace: | news-int.gatech.edu 945008258 6428 128.61.38.184 (12 Dec 1999 14:17:38 GMT) |
X-Complaints-To: | usenet AT news DOT gatech DOT edu |
NNTP-Posting-Date: | 12 Dec 1999 14:17:38 GMT |
User-Agent: | tin/pre-1.4-19990517 ("Psychonaut") (UNIX) (Linux/2.2.5 (i686)) |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
I think I've found a bug in the DJGPP compiler (gcc 2.95.2). When optimized with -O2 the following small sample program goes into an infinite loop. Debugging with gdb shows strange behaviour like modifications of the 'size' variable. <-- cut here --> static void bug(int size, int tries) { int i; int num = 0; while (num < size) { for (i = 1; i < tries; i++) num++; } } int main() { bug(5, 10); return 0; } <-- cut here --> -- Robert Ruehlmann ( rr9 AT angband DOT org ) "Thangorodrim - The Angband Page" : http://thangorodrim.angband.org/ Visit the #angband chat channel at Othernet (irc.othernet.org).
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