If you write code like this: QList<QByteArray> fmts = QImageWriter::supportedImageFormats(); foreach(QByteArray f, fmts) qDebug(" %s", f.constData()); the list is bmp ico jpeg jpg png ppm tif tiff xbm xpm In the ebuilds, qt-core is configured with -no-gif but qt-gui is configured with -qt-gif. /usr/lib64/qt4/plugins/imageformats/libqgif.so exists, and equery says it belongs to qt-gui. Maybe it is ruled out somehow because qt-core was configured with -no-gif? But that's also hard to believe because I think some of those other image formats had to come from plugins as well. Reproducible: Didn't try Portage 2.1.6.13 (default/linux/amd64/2008.0, gcc-4.1.2, glibc-2.8_p20080602-r1, 2.6.30 x86_64) ================================================================= System uname: Linux-2.6.30-x86_64-Intel-R-_Core-TM-2_CPU_T5600_@_1.83GHz-with-glibc2.2.5 Timestamp of tree: Tue, 30 Jun 2009 02:00:01 +0000 ccache version 2.4 [enabled] app-shells/bash: 3.2_p39 dev-java/java-config: 1.3.7, 2.1.7 dev-lang/python: 2.4.4-r13, 2.5.4-r2 dev-python/pycrypto: 2.0.1-r6 dev-util/ccache: 2.4-r7 dev-util/cmake: 2.6.4 sys-apps/baselayout: 2.0.1 sys-apps/openrc: 0.3.0-r1 sys-apps/sandbox: 1.6-r2 sys-devel/autoconf: 2.13, 2.63 sys-devel/automake: 1.5, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.2 sys-devel/binutils: 2.18-r3 sys-devel/gcc-config: 1.4.1 sys-devel/libtool: 1.5.26 virtual/os-headers: 2.6.27-r2 ACCEPT_KEYWORDS="amd64" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=athlon64 -O2 -pipe -fno-ident -fomit-frame-pointer" 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/config" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c /etc/udev/rules.d" CXXFLAGS="-march=athlon64 -O2 -pipe -fno-ident -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="ccache distlocks fixpackages parallel-fetch protect-owned sandbox sfperms strict unmerge-orphans userfetch" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/distributions/gentoo" LANG="en_US" LDFLAGS="-Wl,-O1" LINGUAS="en ru" MAKEOPTS="-j3" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="16bit 3dnow 3dnowext X a52 aac acct acl acpi alac alsa amd64 amr amrnb amrwb ao arts autoipd automount autostart avahi bash-completion berkdb bidi bluetooth bookmarks bzip2 cairo calendar cdb cdda cddb cdio cdparanoia cdr cli contactnotes cracklib cups curl daap dbus dc1394 device-mapper dga dia directfb djvu doc dri dssi dts dv dvb dvbplayer dvd dvdnav dvdr dvdread emacs enca encode espeak exif expat fame fbcon festival ffmpeg fftw flac flite fortran fuse garmin gcj gd gdbm ggi gif git glib glitz gpm gps graphviz gs gstreamer gtk hal httpd hyperestraier iconv id3 id3tag ieee1394 image imagemagick imap imlib inkjar inotify ipod ipv6 irda isdnlog italk itrax jabber jack jbig jfs jpeg jpeg2k kde kqemu ladspa lame ldap libnotify libsamplerate lirc lircsettings live loop-aes lzo mad madwifi matroska mbrola mdnsresponder-compat midi mikmod mjpeg mmx mmxext mng modplug mono mozdevelop mp2 mp3 mp3rtp mp4 mpeg mplayer mudflap multilib musicbrainz nas ncurses nemesi net netjack nls nptlonly nsplugin ntfs ntp objc objc++ objc-gc ogg openal opengl openmp openstreetmap pam pcre pda pdf perl plotutils png pnm posix postgres postscript ppds pppd pulseaudio python qt3 qt3support qt4 quicktime rar readline reflection reiser4 reiserfs rrdcgi rrdtool rss rtc rtsp samba sametime scripting sdl sdl-image sdl-sound sdlaudio sensord server session shorten shout skins slang slp smp sndfile soundtouch speex spl sql sqlite sqlite3 srt sse sse2 ssl startup-notification stream subversion svg swig sysfs tcpd teletext theora threads threadsafe tiff timidity transcode truetype twolame unicode upnp urandom usb v4l v4l2 vamp vcd vdr vim-with-x visualization vlm vnc vorbis webdav wifi wmf x264 xanim xcb xfs xine xml xorg xosd xscreensaver xv xvid xvmc yv12 zeroconf zlib zvbi" 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 mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic auth_digest authn_anon authn_dbd authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif so speling status unique_id userdir usertrack vhost_alias" ELIBC="glibc" INPUT_DEVICES="evdev keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="en ru" LIRC_DEVICES="macmini" USERLAND="GNU" VIDEO_CARDS="vesa v4l fbdev i810 intel" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, FFLAGS, INSTALL_MASK, LC_ALL, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY
Qt does not support writing GIF images. Have you actually read the documentation before filing this bug? http://doc.trolltech.com/4.5/qimagewriter.html#supportedImageFormats http://doc.trolltech.com/4.5/qimagereader.html#supportedImageFormats The qgif plugin is indeed loaded correctly by QImageReader.
Oops you are right. It's the first time I had tried to write a GIF from Qt actually; I assumed it could write everything that it can read.
