Bug 465590 – dev-qt/qtcore-4.8.4[c++0x] with sys-devel/gcc-4.8.0 - kernel/qeventdispatcher_unix.cpp:360:30: error: redeclaration ‘constexpr T qAbs(const T&) [with T = timeval]’ differs in ‘constexpr’

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description Krzysztof Nowicki 2013-04-11 22:13:27 UTC]

I've tried to compile QtCore with GCC 4.8 but the compilation fails. Disabling the "c++0x" use flag or switching back to GCC 4.7 makes the build succeed.




Reproducible: Always




# emerge --info
Portage 2.1.11.55 (hardened/linux/amd64, gcc-4.8.0, glibc-2.15-r3, 3.7.5-hardened-r1 x86_64)
=================================================================
System uname: Linux-3.7.5-hardened-r1-x86_64-Intel-R-_Core-TM-_i5-2520M_CPU_@_2.50GHz-with-gentoo-2.2
KiB Mem:     8109820 total,    535904 free
KiB Swap:    8388604 total,   7761944 free
Timestamp of tree: Wed, 10 Apr 2013 15:45:01 +0000
ld GNU ld (Linux/GNU Binutils) 2.23.51.0.8.20121218
distcc 3.1 x86_64-pc-linux-gnu [disabled]
ccache version 3.1.9 [disabled]
app-shells/bash:          4.2_p37
dev-java/java-config:     2.1.12-r1
dev-lang/python:          2.7.3-r3, 3.2.3-r2
dev-util/ccache:          3.1.9
dev-util/cmake:           2.8.9
dev-util/pkgconfig:       0.28
sys-apps/baselayout:      2.2
sys-apps/openrc:          0.11.8
sys-apps/sandbox:         2.5
sys-devel/autoconf:       2.13, 2.69
sys-devel/automake:       1.9.6-r3, 1.11.6
sys-devel/binutils:       2.22-r1, 2.22.90, 2.23.51.0.8, 2.23.51.0.9
sys-devel/gcc:            4.6.3, 4.7.2-r1, 4.8.0
sys-devel/gcc-config:     1.7.3
sys-devel/libtool:        2.4-r1
sys-devel/make:           3.82-r4
sys-kernel/linux-headers: 3.7 (virtual/os-headers)
sys-libs/glibc:           2.15-r3
Repositories: gentoo kde bazaar sunrise local
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA @FSF-APPROVED Oracle-BCLA-JavaSE googleearth ut2003 AdobeFlash-10.3 skype-4.0.0.7-copyright PUEL"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -march=corei7-avx -pipe -floop-interchange -floop-strip-mine -floop-block"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/maven-bin-2.0/conf /usr/share/maven-bin-2.2/conf /usr/share/polkit-1/actions /usr/share/themes/oxygen-gtk/gtk-2.0 /var/bind /var/lib/hs
qldb"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/splash /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/languag
e.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-O2 -march=corei7-avx -pipe -floop-interchange -floop-strip-mine -floop-block"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans
 userfetch xattr"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://ftp.vectranet.pl/gentoo/ http://gentoo.po.opole.pl/"
LC_ALL="en_GB.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j5"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/mnt/zram/"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage/layman/kde /usr/local/portage/layman/bazaar /usr/local/portage/layman/sunrise /usr/local/portage"
SYNC="rsync://192.168.123.15/gentoo-portage"
USE="X a52 aac acl acpi addns ads alsa amd64 avahi bash-completion bazaar berkdb bluetooth bzip2 c++0x cairo cdda cli consolekit cracklib crypt cups custom-optimization cxx dbus declarative dia dri dts dvd ebook enco
de exif fam fbcondecor flac fontconfig fortran gdbm gif git gpm gps gstreamer gtk hardened iconv inotify ipv6 jit jpeg justify kde kerberos keymap kipi kpathsea latex lcms ldap libnotify lzma mad mercurial mmx mng mo
dules mp3 mp4 mpeg mudflap multilib ncurses networkmanager nls nptl nsplugin ogg opengl openmp pam pango pax_kernel pcre pdf perl pgo phonon plasma png policykit qt3support qt4 radius readline samba sdl semantic-desk
top session spell spice sql sqlite sse sse2 sse3 ssl ssse3 startup-notification subversion svg system-sqlite systemd taglib tcpd telepathy tiff truetype udev udisks unicode urandom usb vaapi vorbis webkit wxwidgets x
264 xcb xcomposite xinerama xml xv xvid zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 triden
t 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 s
hm softvol" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner
 authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif sp
eling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap sys
log" DRACUT_MODULES="btrfs crypt gensplash lvm" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm
104v3 sirf superstar2 timing tsip tripmate tnt ubx" GRUB_PLATFORMS="efi-32 efi-64 pc" INPUT_DEVICES="evdev synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text"
 LIBREOFFICE_EXTENSIONS="pdfimport presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" QEMU_SOFTMMU_TA
RGETS="x86_64 mipsel i386" RUBY_TARGETS="ruby19" USERLAND="GNU" VIDEO_CARDS="vmware vesa intel" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq ste
al rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON

[Comment 1 Krzysztof Nowicki 2013-04-11 22:14:20 UTC]

Created attachment 345288 [details]
Build log

[Comment 2 Joe Kappus 2013-04-13 04:13:59 UTC]

Created attachment 345422 [details, diff]
gcc-4.8-fix.patch

Yay someone made a bug so I don't have to, here's the patch.

https://codereview.qt-project.org/#change,53738 Referenced here too.

[Comment 3 Davide Pesavento (RETIRED) 2013-04-13 23:40:19 UTC]

This appears to be a gcc bug, see http://lists.qt-project.org/pipermail/development/2013-March/010587.html

I will apply the workaround to qtcore-4.8.4 anyway.

[Comment 4 David Heidelberg (okias) 2013-04-27 10:10:34 UTC]

gcc-4.8.0 with qt-5.0.2 same problem on ~amd64. qt-5.9999 seems fine.

[Comment 5 Davide Pesavento (RETIRED) 2013-04-29 04:58:45 UTC]

(In reply to comment #4)
> gcc-4.8.0 with qt-5.0.2 same problem on ~amd64. qt-5.9999 seems fine.

bug 467060

[Comment 6 Davide Pesavento (RETIRED) 2013-05-27 09:50:54 UTC]

Fixed in cvs. Thanks!