Using -O3 in CFLAGS on opteron (and from memory my centrino laptop too) causes peculiar behaviours and general instability in inkscape. My CFLAGS were "-march=opteron -O3 -pipe -funroll-loops -fomit-frame-pointer" Reproducible: Always Steps to Reproduce: 1. Edit make.conf to use CFLAGS="-march=opteron -O3 -pipe -funroll-loops -fomit-frame-pointer" 2. emerge inkscape 3. run inkscape and do some simple drawing, open files etc Actual Results: Random lockups and segfaults, drawing objects not moving as intended by mouse movement. Expected Results: Drawing objects move with mouse, scaled appropriately etc. It seems -O3 (or one of the other optiosn noted) is an unstable cflag, perhaps x86_64 specific? Portage 2.0.51.19 (default-linux/amd64/2004.3, gcc-3.4.3, glibc-2.3.4.20041102-r0, 2.6.9-gentoo-r14-omni x86_64) ================================================================= System uname: 2.6.9-gentoo-r14-omni x86_64 AMD Opteron(tm) Processor 246 Gentoo Base System version 1.4.16 Python: dev-lang/python-2.3.4-r1 [2.3.4 (#1, Feb 9 2005, 22:33:33)] distcc 2.18.3 x86_64-pc-linux-gnu (protocols 1 and 2) (default port 3632) [disabled] dev-lang/python: 2.3.4-r1 sys-devel/autoconf: 2.13, 2.59-r6 sys-devel/automake: 1.5, 1.8.5-r3, 1.6.3, 1.7.9-r1, 1.4_p6, 1.9.4 sys-devel/binutils: 2.15.92.0.2-r1 sys-devel/libtool: 1.5.10-r4 virtual/os-headers: 2.6.8.1-r2 ACCEPT_KEYWORDS="amd64" AUTOCLEAN="yes" CFLAGS="-march=opteron -O3 -pipe -funroll-loops -fomit-frame-pointer" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/X11R6/lib/X11/xkb /usr/kde/2/share/config /usr/kde/3.3/env /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3/share/config /usr/lib/mozilla/defaults/pref /usr/share/config /usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/ /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/ /usr/share/texmf/xdvi/ /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d" CXXFLAGS="-march=opteron -O3 -pipe -funroll-loops -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="autoaddcvs autoconfig ccache distlocks sandbox" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/Linux/distributions/gentoo" MAKEOPTS="-j5" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="amd64 X aac acl acpi aim alsa apache2 apm arts artswrappersuid audiofile avi bash-completion berkdb bidi bitmap-fonts bonobo bzlib canna cdparanoia cdr cjk crypt cscope ctype cups curl curlwrappers divx4linux dmx doc dvd dvdr dvdread encode esd ethereal evo exif f77 fam fbcon fftw flac font-server foomaticdb fortran ftp gd gif gimpprint gnome gnutls gphoto2 gpm graphviz gstreamer gtk gtk2 gtkhtml icq imagemagick imap imlib ipv6 jabber jack jack-tmpfs java jp2 jpeg jpeg2k junit ladcca lcms libwww live lzw lzw-tiff mad maildir matroska mbox mikmod mime mmap mng mozdevelop mozilla mozsvg mozxmlterm mp3 mpeg mpi msn multilib nas ncurses network nls nptl nvidia offensive oggvorbis openal opengl oscar oss pam pcntl pcre pdflib perl php pic pie plotutils png posix povray python qt quicktime readline rtc samba sasl sdl session shared sharedmem slang smp sndfile sockets sox speex spell spl sqlite svg sysvipc tcltk tcpd tetex tga theora tidy tiff tokenizer truetype truetype-fonts type1-fonts unicode usb userlocales v v4l v4l2 vhosts videos wifi wmf wxwindows xanim xchatdccserver xchattext xface xine xinerama xml xml2 xmlrpc xmms xosd xpm xprint xrandr xscreensaver xsl xv xvid xvmc yv12 zeo zlib" Unset: ASFLAGS, CBUILD, CTARGET, LANG, LC_ALL, LDFLAGS
let bugwranglers do the assignment
(In reply to comment #0) > It seems -O3 (or one of the other optiosn noted) is an unstable cflag, perhaps > x86_64 specific? As someone who has worked on GCC itself, I *strongly* recommend against using -O3 and -funroll-loops as default CFLAGS. They work for the majority of applications, but not all. In a significant number of cases, -O2 produces *faster* code than -O3. See my article at: http://www.coyotegulch.com/products/acovea/aco5k8gcc40.html Which I suppose means I should put in another plug for package-specific flags... ;)
using -O3 is simply not recommended for normal use by the gcc documentation. proposed to be closed.
(In reply to comment #3) > using -O3 is simply not recommended for normal use by the gcc documentation. > proposed to be closed. Good idea. What version of inkscape was this anyway? I can't imagine it is still a problem now.
The reason I reported this is I've seen many apps report that they filter cflags. I thought that by reporting this, inkscape could have forcefully -O3 filtered out on compile. I've personally given up on gentoo, but filtering cflags that are known to be unstable for some apps that may work for others would help the overall quality of a gentoo install.
