Package: libc6
Version: 2.3.2.ds1-22
Followup-For: Bug #318959
Actually there is something wrong even without "volatile":
/* file: ki.c */
#include <stdio.h>
#include <math.h>
extern long int lround(double x);
int main()
{
double b;
long int i;
b = 1.04866e+6;
i = lround(b);
printf("%e %ld %ld\n", b, lround(b), i);
return 0;
}
try running the following bash script:
for c in 3.3 3.4 4.0; do
for o in 0 1 2 3 ; do
printf "gcc-%s -O%s\t" $c $o;
gcc-$c -W -Wall -O$o -std=c99 ki.c -lm;
./a.out;
done;
done
on my debian (stable, uniprocessor), the results are... mysterious:
gcc-3.3 -O0 1.048660e+06 -2146434988 -2146434988
gcc-3.3 -O1 1.048660e+06 -2146434988 -2146434988
gcc-3.3 -O2 1.048660e+06 -2146434988 -2146434988
gcc-3.3 -O3 1.048660e+06 -2146434988 -2146434988
gcc-3.4 -O0 1.048660e+06 -2146434988 -2146434988
gcc-3.4 -O1 1.048660e+06 -2146434988 -2146434988
gcc-3.4 -O2 1.048660e+06 -2146434988 -2146434988
gcc-3.4 -O3 1.048660e+06 -2146434988 -2146434988
gcc-4.0 -O0 1.048660e+06 -2146434988 -2146434988
gcc-4.0 -O1 1.048660e+06 1048660 1048660
gcc-4.0 -O2 1.048660e+06 1048660 1048660
gcc-4.0 -O3 1.048660e+06 1048660 1048660
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (500, 'stable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.8-2-686-smp
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages libc6 depends on:
ii libdb1-compat 2.1.3-7 The Berkeley database routines [gl
libc6 recommends no packages.
-- no debconf information
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