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Bug 252

Summary: Run time error
Product: [Retired] Red Hat Linux Reporter: xshen
Component: libcAssignee: David Lawrence <dkl>
Status: CLOSED WORKSFORME QA Contact:
Severity: medium Docs Contact:
Priority: high    
Version: 5.1   
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 1998-12-03 17:03:13 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Description xshen 1998-12-01 21:29:06 UTC
I use gcc and g++ to compile the following small code

#include <math.h>
main()
{
	double a[2];
	pow(2.0,3.0);
}

If I use -O2 option, and when I run the program
I get "segmentation fault(core dumped)". If I do
not use "-O2" option, I won't get any error. I also
upgrade gcc-2.7.2.3 to gcc-2.8.1 and I still get
same type error, but only when I change "double a[2]" into
"int a[2]".

Why does this happen?

BTW, I upgraded the libc and glib package ftped from
your web site.

Comment 1 xshen 1998-12-01 22:08:59 UTC
I tested this in a Pc with redhat 5.0, and no error.

Comment 2 xshen 1998-12-02 00:53:59 UTC
In /usr/include/__math.h:552, if I change this line into
long long int __p = (long int) __y,

then I won't get error. Is this the problem?

The original line is

long long int __p = (long long int) __y

Comment 3 David Lawrence 1998-12-03 17:03:59 UTC
Could not replicate this problem on a test machine.
Used gcc-2.7.2.3-14 rpm.

Comment 4 xshen 1998-12-03 17:34:59 UTC
Did you try to change "double a[2];" to "int a[2];"? Only one
of them will generate error by using gcc-2.7.2.3 with "-O2" option.

Thanks!