Bug#222377: marked as done (g++-2.95 incorrectly handles in64_t type with optimizing)
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Date: Fri, 28 Nov 2003 12:35:20 +0200
From: Alexei Khlebnikov <a.khlebnikau@sam-solutions.net>
To: submit@bugs.debian.org
Subject: g++-2.95 incorrectly handles in64_t type with optimizing
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Package: g++-2.95
Version: 1:2.95.4-19
When combine working with int32 and int64, not all operations performed
correctly.
Here is code example
=begin
#include <stdint.h>
#include <stdio.h>
#include <iostream>
int main()
{
const long int offset = 1025;
FILE* F = fopen("samplefile", "r");
fseek(F, offset, SEEK_SET);
const int64_t num2 = ftell(F);
std::cerr << num2 / 1024 << ", must be 1\n";
fclose(F);
return 0;
}
=end
Here is a script, showing incorrect behaviour:
=begin
#!/bin/sh
CXX=g++-2.95
dd if=/dev/zero of=samplefile bs=2K count=1
rm -f ./int64
$CXX -v
$CXX -O3 -o ./int64 int64.cpp
./int64
=end
The script's output:
=begin
1+0 records in
1+0 records out
2048 bytes transferred in 0.007738 seconds (264668 bytes/sec)
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.4/specs
gcc version 2.95.4 20011002 (Debian prerelease)
2, must be 1
=end
The bug is reproduceable at least on Pentium 1 and Pentium 4 debian machines.
I've tried this testcase on Alt Linux Master 2.0 with g++ 2.95.3,
the bug is not reproduceable there. Seems like it is debian-specific bug.
When not optimizing, the bug is not triggered, and the lasy line is printed as
"1, must be 1".
When using g++-3.0, g++-3.2 or g++-3.3 with optimizing, the last line
is also printed correctly.
gcc-2.95 package probably also has this bug. A bug might be also in libstdc++.
I attach to this mail the source and the script.
I am using Debian GNU/Linux 3.0r0 packages mixed with packages from testing (sarge) tree.
$uname -a
Linux hostname 2.4.20-debianpatches-freeswan-lowlatency #1 Mon Nov 17 12:54:29 EET 2003 i686 GNU/Linux
As you see, I am also patched the kernel with freeswan and low latency patches.
I am using libc6 version 2.3.2.ds1-10 from testing.
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>From doko@cs.tu-berlin.de Sat Dec 06 05:50:00 2003
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Message-ID: <16337.46794.158475.437202@gargle.gargle.HOWL>
Date: Sat, 6 Dec 2003 12:00:26 +0100
To: 222377-done@bugs.debian.org
Subject: fixed in default g++ in sarge/unstable
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closing this report, as it is fixed upstream. if you need g++-2.95,
then pleae use -O0 as a workaround.
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