The system starts out compiling gcc-3.3.6 with gcc-4.x and then my CFLAGS CXXFLAGS is fine, but when gcc-3 tries to compile it self with it self, it gets in trouble, since there isn't any athlon64 flag for march in the compiler. A quick work around is to remove -march=athlon64 while compiling gcc-3
Portage 2.1.2.11 (default-linux/x86/2007.0/desktop, gcc-4.1.2, glibc-2.5-r4, 2.6.19-gentoo-r5-Confidence i686) ================================================================= System uname: 2.6.19-gentoo-r5-Confidence i686 AMD Athlon(tm) 64 X2 Dual Core Processor 5000+ Gentoo Base System release 1.12.9 Timestamp of tree: Fri, 03 Aug 2007 00:50:01 +0000 distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632) [enabled] ccache version 2.4 [enabled] dev-java/java-config: 1.3.7, 2.0.33-r1 dev-lang/python: 2.4.4-r4 dev-python/pycrypto: 2.0.1-r6 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: 2.17 sys-devel/gcc-config: 1.3.16 sys-devel/libtool: 1.5.23b virtual/os-headers: 2.6.17-r2 ACCEPT_KEYWORDS="x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=athlon64 -msse3 -pipe -fomit-frame-pointer" 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/revdep-rebuild /etc/splash /etc/terminfo" CXXFLAGS="-O2 -march=athlon64 -msse3 -pipe -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--usepkg --newuse --ask --update --deep --buildpkg" FEATURES="buildpkg ccache distcc distlocks fixpackages metadata-transfer parallel-fetch sandbox sfperms strict" GENTOO_MIRRORS="http://mirror.uni-c.dk/pub/gentoo/ " LANG="da_DK.UTF-8" LINGUAS="da en" MAKEOPTS="-j5" 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/layman/xeffects /usr/local/portage/layman/musicbrainz" SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage" USE="3dnow X Xaw3d a52 aac acpi alsa bash-completion berkdb bitmap-fonts bonobo branding cairo cddb cdparanoia cdr cli cracklib crypt cups dbus dri dts dvd dvdr dvdread eds emacs encode esd evo exif fam firefox ftp gdbm gif gnome gnutls gstreamer gtk gtkhtml hal iconv idn isdnlog java jpeg kde kerberos libg++ libgda libnotify lirc lm_sensors mad midi mikmod mmx mmxext mono motif mp3 mpeg musicbrainz ncurses nls nptl nptlonly nsplugin ogg opengl openmp pam pcre pdf perl png portaudio pppd python qt3 qt3support qt4 quicktime readline reflection samba sdl session spell spl sse sse2 ssl startup-notification svg tetex threads tiff truetype truetype-fonts type1-fonts unicode vorbis win32codecs x86 xml xorg xscreensaver xv zlib" ALSA_CARDS="ca0106" 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" ELIBC="glibc" INPUT_DEVICES="keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="da en" LIRC_DEVICES="hauppauge" USERLAND="GNU" VIDEO_CARDS="nvidia" Unset: CTARGET, INSTALL_MASK, LC_ALL, LDFLAGS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
*** This bug has been marked as a duplicate of bug 180184 ***