Bugzilla Bug 174087

I have used it succesfully on amd64:

Portage 2.1.2.2 (default-linux/amd64/2006.1, gcc-4.1.1, glibc-2.5-r0,
2.6.20-ck1 x86_64)
=================================================================
System uname: 2.6.20-ck1 x86_64 AMD Athlon(tm) 64 Processor 3200+
Gentoo Base System release 1.12.9
Timestamp of tree: Tue, 10 Apr 2007 18:20:01 +0000
ccache version 2.4 [enabled]
dev-java/java-config: 1.3.7, 2.0.31
dev-lang/python:     2.4.3-r4
dev-python/pycrypto: 2.0.1-r5
dev-util/ccache:     2.4-r6
sys-apps/sandbox:    1.2.17
sys-devel/autoconf:  2.13, 2.61
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10
sys-devel/binutils:  2.16.1-r3
sys-devel/gcc-config: 1.3.14
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.19.2-r2
ACCEPT_KEYWORDS="amd64"
AUTOCLEAN="yes"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=k8 -O2 -pipe -msse3"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/share/X11/xkb /usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf
/etc/java-config/vms/ /etc/revdep-rebuild /etc/splash /etc/terminfo
/etc/texmf/web2c"
CXXFLAGS="-march=k8 -O2 -pipe -msse3"
DISTDIR="/usr/distfiles"
FEATURES="autoaddcvs ccache collision-protect cvs distlocks metadata-transfer
multilib-strict parallel-fetch sandbox sfperms strict"
GENTOO_MIRRORS="http://ftp.belnet.be/mirror/rsync.gentoo.org/gentoo/"
LANG="es_ES.UTF-8"
LC_ALL="es_ES.UTF-8"
LINGUAS="es en_US"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_EXTRA_OPTS="--exclude-from=/etc/portage/rsync_excludes"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --delete-after --stats --timeout=180
--exclude=/distfiles --exclude=/local --exclude=/packages
--filter=H_**/files/digest-*"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/portage/local/layman/armagetron
/usr/portage/local/layman/sunrise /usr/local/portage"
SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage"
USE="X a52 aac aalib acpi alsa amd64 apache2 arts asf audiofile bash-completion
beagle bitmap-fonts bzip2 bzlib cairo caps cdb cdda cddb cdparanoia cdr cli
cpdflib cpudetection cracklib cross crypt cscope cups curl dbus dga divx4linux
dlloader dri dts dvb dvd dvdr dvdread encode erandom escreen esd evo evolution
exif fam fbcon flac foomaticdb fortran ftp galago gb gcj ggi gif gimp gimpprint
glitz glut glx gnome gnome-print gphoto2 gpm gstreamer gtk gtk2 gtkhtml hal
iconv idn imagemagick imlib isdnlog ithreads jabber jack java jpeg kde
kdeenablefinal kdehiddenvisibility latex lcms libg++ libnotify logrotate mad
madwifi midi mikmod mime mng mono motif mp3 mpeg mpi mplayer musepack
musicbrainz nas nautilus ncurses nethack network nls nocardbus nptl nptlonly
nvidia ogg oggvorbis openal opengl oss pam pcre pdf perl pic plotutils png
posix ppds pppd python qt3 qt4 quicktime readline reflection rtc ruby scanner
sdl seamonkey session slang slp sockets spell spl sse3 ssl startup-notification
svg sysvipc tcltk tcpd tetex theora threads tiff timidity tk totem trayicon
truetype truetype-fonts type1-fonts unicode usb v4l v4l2 vcd videos vim vorbis
wma wmf xcomposite xine xml xml2 xorg xpm xv xvid zlib" ALSA_CARDS="ali5451
als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938
es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx
via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop
empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mulaw multi
null plug rate route share shm softvol" DVB_CARDS="usb-dib0700" ELIBC="glibc"
INPUT_DEVICES="keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz
cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="es en_US"
USERLAND="GNU" VIDEO_CARDS="nvidia nv vesa fbdev vga"
Unset:  CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LDFLAGS, PORTAGE_COMPRESS,
PORTAGE_COMPRESS_FLAGS

Thanks

amd64 stable

app-cdr/disc-cover-1.5.6  USE="cdrom"
1. emerges on x86
2. passes collision test
3. works

Portage 2.1.2.2 (default-linux/x86/2006.1/desktop, gcc-4.1.1, glibc-2.5-r0,
2.6.20.7 i686)
=================================================================
System uname: 2.6.20.7 i686 AMD Athlon(TM) XP1800+
Gentoo Base System release 1.12.9
Timestamp of tree: Thu, 26 Apr 2007 19:30:08 +0000
ccache version 2.4 [enabled]
dev-java/java-config: 1.3.7, 2.0.31-r5
dev-lang/python:     2.3.5-r3, 2.4.3-r4
dev-python/pycrypto: 2.0.1-r5
dev-util/ccache:     2.4-r7
sys-apps/sandbox:    1.2.17
sys-devel/autoconf:  2.13, 2.61
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10
sys-devel/binutils:  2.16.1-r3
sys-devel/gcc-config: 1.3.15-r1
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.17-r2
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=i686 -fomit-frame-pointer -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/share/X11/xkb /usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf
/etc/java-config/vms/ /etc/php/apache1-php4/ext-active/
/etc/php/apache1-php5/ext-active/ /etc/php/apache2-php4/ext-active/
/etc/php/apache2-php5/ext-active/ /etc/php/cgi-php4/ext-active/
/etc/php/cgi-php5/ext-active/ /etc/php/cli-php4/ext-active/
/etc/php/cli-php5/ext-active/ /etc/revdep-rebuild /etc/terminfo
/etc/texmf/web2c"
CXXFLAGS="-O2 -march=i686 -fomit-frame-pointer -pipe"
DISTDIR="/usr/portage/distfiles"
EMERGE_DEFAULT_OPTS="--nospinner"
FEATURES="ccache collision-protect distlocks fixpackages metadata-transfer
parallel-fetch sandbox sfperms strict test userfetch userpriv usersandbox"
GENTOO_MIRRORS="http://mirror.switch.ch/mirror/gentoo/ http://gentoo.inode.at/"
LANG="en_GB.utf8"
LINGUAS="en de en_GB"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --delete-after --stats --timeout=180
--exclude=/distfiles --exclude=/local --exclude=/packages
--filter=H_**/files/digest-*"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage/normal"
SYNC="rsync://192.168.2.1/gentoo-portage"
USE="3dnow 3dnowext X a52 aac alsa apache2 berkdb bitmap-fonts bzip2 cairo cdr
cli cracklib crypt cups dbus divx4linux dri dts dvd dvdr dvdread eds emboss
exif fam ffmpeg firefox fortran gdbm gif gnome gphoto2 gpm gstreamer gtk hal
iconv ipv6 isdnlog java jpeg kde ldap libg++ mad midi mikmod mmx mmxext mono
mp3 mpeg ncurses network nls nptl nptlonly ogg opengl oss pam pcre perl png
ppds pppd python qt qt3 qt4 quicktime readline reflection samba sdl seamonkey
session spell spl ssl svg tcpd test tetex tiff truetype truetype-fonts
type1-fonts unicode usb vcd vorbis win32codecs x86 xine xinerama xml xorg
xprint xv xvid zlib" ELIBC="glibc" INPUT_DEVICES="mouse keyboard"
KERNEL="linux" LINGUAS="en de en_GB" USERLAND="GNU" VIDEO_CARDS="nv none"
Unset:  CTARGET, INSTALL_MASK, LC_ALL, LDFLAGS, MAKEOPTS, PORTAGE_COMPRESS,
PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

sparc stable.

Stable on ppc

x86 stable, thanks Markus, closing.