I just upgraded to gcc 3.4.1 (now ~x86), and pulled an emerge -e world. Now gtk-sharp apps refuse to work as expected. (blam, muine). When scrolling in these apps, they crash immediately. Muine refuses to be traced. Blam outputs a bit of a traceback: Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object in (unmanaged) (wrapper managed-to-native) Gtk.Application:gtk_main () in <0x00004> (wrapper managed-to-native) Gtk.Application:gtk_main () in <0x00007> Gtk.Application:Run () in <0x00007> Gnome.Program:Run () in <0x0005a> Imendio.Blam.Application:Main (string[]) /usr/bin/blam: line 6: 25705 Killed mono /usr/lib/blam/blam.exe $@ emerge info for fun: emerge info Portage 2.0.51_pre23 (default-x86-2004.2, gcc-3.4.1, glibc-2.3.4.20040808-r0, 2.6.8-gentoo-r3 i686) ================================================================= System uname: 2.6.8-gentoo-r3 i686 Intel(R) Pentium(R) M processor 1500MHz Gentoo Base System version 1.5.3 Autoconf: sys-devel/autoconf-2.59-r4 Automake: sys-devel/automake-1.8.5-r1 Binutils: sys-devel/binutils-2.15.90.0.1.1-r3 Headers: sys-kernel/linux-headers-2.4.22 Libtools: sys-devel/libtool-1.5.2-r5 ACCEPT_KEYWORDS="x86 ~x86" AUTOCLEAN="yes" CFLAGS="-O2 -march=pentium3 -msse2 -fomit-frame-pointer" CHOST="i686-pc-linux-gnu" COMPILER="" CONFIG_PROTECT="/etc /usr/X11R6/lib/X11/xkb /usr/kde/2/share/config /usr/kde/3.2/share/config /usr/kde/3/share/config /usr/lib/mozilla/defaults/pref /usr/share/config /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d" CXXFLAGS="-O2 -march=pentium3 -msse2 -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="ccache cvs sandbox" GENTOO_MIRRORS="http://gentoo.osuosl.org http://distro.ibiblio.org/pub/Linux/distributions/gentoo" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/overlays/gentoo" SYNC="rsync://192.168.1.3/gentoo-portage" USE="X alsa apm avi berkdb bitmap-fonts cdr cdrw crypt cups dvd encode esd flac foomaticdb gdbm gif gnome gpm gtk gtk2 hal imlib jpeg libg++ libwww mad mikmod motif mozilla moznocompose moznoirc moznomail mpeg ncurses nls oggvorbis opengl oss pam pda pdflib perl png python quicktime readline sdl slang spell ssl svga tcpd truetype x86 xml2 xprint xv zlib"
Closing with tseng's consent. He suspects an sse2 optimization bug. Unable to reproduce here.