Public bug reported:
When building kdenetwork 4.8.3 in quantal with the default options, it
fails with (fatal-warnings is used):
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crtn.oCMakeFiles/kopete_qq.dir/evautil.o:
In function `memset':
/usr/include/x86_64-linux-gnu/bits/string3.h:82: warning: memset used with
constant zero length parameter; this could be due to transposed parameters
collect2: error: ld returned 1 exit status
The relevant code would be:
ByteArray Packet::encrypt( const ByteArray& text, const ByteArray& key )
{
int pos, len, i;
</snip>
pos = ( text.size() + 10 ) % 8;
if( pos )
pos = 8 - pos;
// Prepare the first 8 bytes:
plain[0] = ( rand() & 0xf8 ) | pos;
memset( plain_pre, 0, 8 );
memset( crypted_pre, 0, 8 );
memset( plain+1, rand()& 0xff, pos++ );
</snip>
ByteArray is defined in libeva.h
The third memset seems to fail (I commented the others out to make sure), but
pos is not a constant value so it makes no sense that g++ evaluates it to
constant 0.
This does NOT happen if you build with -O0 by setting DEB_BUILD_OPTIONS=noop
Attached is a build log with -Wl,--verbose if it helps.
ProblemType: BugDistroRelease: Ubuntu 12.10
Package: gcc-4.7 4.7.0-7ubuntu3 [modified: usr/bin/gcc-4.7]
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: vboxpci vboxnetadp vboxnetflt vboxdrv
ApportVersion: 2.1-0ubuntu1
Architecture: amd64
Date: Sun May 20 21:02:26 2012
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20111007)
ProcEnviron:
SHELL=/bin/bash
TERM=screen
PATH=(custom, user)
LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8SourcePackage: gcc-4.7
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gcc-4.7 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal
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https://bugs.launchpad.net/bugs/1002030
Title:
kdenetwork 4.8.3 fails to build with gcc 4.7 and level 2 optimizations
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