Has been in ~arch for plenty of time. Upgrade from 3.0.0 barfed on my x86 with collisions on .pyc files, though. System is several months old, so I don't suppose there's some ancient eclass breakage to worry about...
amd64 stable
media-sound/jack-3.1.1 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.
x86 stable, thanks Markus.
ppc64 stable
stable on ppc.
Might as well close it since we're all done.