I wonder if I hit this because I have no USE=cxx enabled in some package, or else? /bin/sh ../libtool --tag=CXX --mode=link x86_64-pc-linux-gnu-g++ -pthread -I/usr/include/json-glib-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/babl-0.1 -O2 -pipe -maes -mpclmul -mpopcnt -mavx -march=native ../gegl/libgegl-0.3.la -Wl,--export-dynamic -lgmodule-2.0 -pthread -ljson-glib-1.0 -lgio-2.0 -lgobject-2.0 -lgthread-2.0 -pthread -lglib-2.0 -lbabl-0.1 -lm -Wl,-O1 -Wl,--as-needed -o exp_combine exp_combine-exp_combine.o -lexiv2 libtool: link: x86_64-pc-linux-gnu-g++ -pthread -I/usr/include/json-glib-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/babl-0.1 -O2 -pipe -maes -mpclmul -mpopcnt -mavx -march=native -Wl,--export-dynamic -pthread -pthread -Wl,-O1 -o .libs/exp_combine exp_combine-exp_combine.o ../gegl/.libs/libgegl-0.3.so -lgmodule-2.0 -ljson-glib-1.0 -lgio-2.0 -lgobject-2.0 -lgthread-2.0 -lglib-2.0 -lbabl-0.1 -lm -Wl,--as-needed -lexiv2 -pthread exp_combine-exp_combine.o: In function `expcombine_get_file_ev(char const*)': exp_combine.cpp:(.text+0x12b): undefined reference to `Exiv2::ImageFactory::open(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' exp_combine.cpp:(.text+0x1d7): undefined reference to `Exiv2::ExifData::operator[](std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' exp_combine.cpp:(.text+0x23a): undefined reference to `Exiv2::ExifData::operator[](std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' exp_combine.cpp:(.text+0x299): undefined reference to `Exiv2::ExifData::operator[](std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' collect2: error: ld returned 1 exit status make[2]: *** [Makefile:638: exp_combine] Error 1 # emerge -pv media-gfx/exiv2 These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild r U ] media-gfx/exiv2-0.25-r2:0/14::gentoo [0.24-r1:0/13::gentoo] USE="nls png%* -doc -examples -webready% -xmp (-contrib%) (-static-libs%) (-zlib%*)" ABI_X86="32 (64) (-x32)" LINGUAS="-bs% -de -es -fi -fr -gl% -ms% -pl -pt% -ru -sk -sv% -ug% -uk% -vi%" 5307 KiB [ebuild rR ] media-gfx/ufraw-0.22::gentoo USE="gimp gtk openmp -contrast -fits -gnome -timezone" 0 KiB Total: 2 packages (1 upgrade, 1 reinstall), Size of downloads: 5307 KiB The following packages are causing rebuilds: (media-gfx/exiv2-0.25-r2:0/14::gentoo, ebuild scheduled for merge) causes rebuilds for: (media-gfx/ufraw-0.22:0/0::gentoo, ebuild scheduled for merge) So, I let the above two recompilations to happen and retried with media-libs/gegl-0.3.8 and it went through now. Maybe you want to inspect DEPENDencies and increase version? Or test for CXX somewhere?
You need to rebuild all C++ libraries after upgrading to GCC 5. Also, always provide emerge --info and a build log.
(In reply to Mike Gilbert from comment #1) > You need to rebuild all C++ libraries after upgrading to GCC 5. How? This is an overkill I guess: equery list '*' | awk ... | while read p; do emerge =$p; done # emerge --info Portage 2.3.0 (python 2.7.11-final-0, default/linux/amd64/13.0, gcc-5.4.0, glibc-2.23-r2, 4.6.3-default-pciehp x86_64) ================================================================= System uname: Linux-4.6.3-default-pciehp-x86_64-Intel-R-_Core-TM-_i7-2640M_CPU_@_2.80GHz-with-gentoo-2.2 KiB Mem: 16375816 total, 10552240 free KiB Swap: 0 total, 0 free Timestamp of repository gentoo: Tue, 02 Aug 2016 16:30:01 +0000 sh bash 4.3_p46 ld GNU ld (Gentoo 2.25.1 p1.1) 2.25.1 app-shells/bash: 4.3_p46::gentoo dev-java/java-config: 2.2.0-r3::gentoo dev-lang/perl: 5.20.2-r1::gentoo dev-lang/python: 2.7.11-r1::gentoo, 3.4.3-r7::gentoo, 3.5.1-r2::gentoo dev-util/cmake: 3.3.2-r1::gentoo dev-util/pkgconfig: 0.28-r2::gentoo sys-apps/baselayout: 2.2-r1::gentoo sys-apps/openrc: 0.21.2::gentoo sys-apps/sandbox: 2.6-r1::gentoo sys-devel/autoconf: 2.13::gentoo, 2.69-r1::gentoo sys-devel/automake: 1.11.6-r1::gentoo, 1.12.6::gentoo, 1.13.4::gentoo, 1.14::gentoo, 1.15::gentoo sys-devel/binutils: 2.25.1-r1::gentoo, 2.26.1::gentoo sys-devel/gcc: 4.3.6-r1::gentoo, 4.4.7::gentoo, 4.6.4::gentoo, 4.7.4::gentoo, 4.8.5::gentoo, 4.9.3::gentoo, 5.3.0::gentoo, 5.4.0::gentoo sys-devel/gcc-config: 1.8::gentoo sys-devel/libtool: 2.4.6-r1::gentoo sys-devel/make: 4.2.1::gentoo sys-kernel/linux-headers: 4.6::gentoo (virtual/os-headers) sys-libs/glibc: 2.23-r2::gentoo Repositories: gentoo location: /scratch/usr/portage sync-type: rsync sync-uri: rsync://rsync.gentoo.org/gentoo-portage priority: -1000 science location: /home/mmokrejs/proj/sci masters: gentoo priority: 0 x-portage location: /usr/local/portage masters: gentoo priority: 1 layman location: /var/lib/layman masters: gentoo priority: 2 haskell location: /var/lib/layman/haskell masters: gentoo priority: 50 ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA dlj-1.1 sun-bcla-java-vm Oracle-BCLA-JavaSE IBM-J1.6 skype-eula Nero-EULA-US AdobeFlash-10.3 skype-4.0.0.7-copyright AdobeFlash-11.x OPERA-2014" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -maes -mpclmul -mpopcnt -mavx -march=native" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /etc/stunnel/stunnel.conf /usr/lib64/libreoffice/program/sofficerc /usr/share/easy-rsa /usr/share/gnupg/qualified.txt /usr/share/maven-bin-3.2/conf /var/bind /var/lib/hsqldb /var/spool/torque" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.4/ext-active/ /etc/php/apache2-php5.5/ext-active/ /etc/php/apache2-php5.6/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cgi-php5.5/ext-active/ /etc/php/cgi-php5.6/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/php/cli-php5.5/ext-active/ /etc/php/cli-php5.6/ext-active/ /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" CXXFLAGS="-O2 -pipe -maes -mpclmul -mpopcnt -mavx -march=native" DISTDIR="/scratch/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news noclean parallel-fetch preserve-libs protect-owned sandbox sfperms splitdebug strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://gentoo.wheel.sk/ http://ftp.fi.muni.cz/pub/linux/gentoo/ http://gentoo.mirror.web4u.cz/ rsync://gentoo.mirror.dkm.cz/gentoo/ ftp://gentoo.mirror.web4u.cz/" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git" PORTAGE_TMPDIR="/scratch/var/tmp" USE="X acpi alsa amd64 amr apache apache2 apulse avx berkdb bindist bluetooth boost bzip2 cairo cgi cli coin consolekit cracklib crypt cryptlib cups cxx dbus device-mapper dhcp directfb dri drm dvd emboss encode fax fbcon ffmpeg flac fontconfig fortran gbm gd gdbm geoip gimp glpk gnutls gpm gtk hal hpijs hwdb iconv id3tag imaging innodb java javascript jce jpeg jpg js jscript keymap ladspa lapack laptop lcms libnotify lm_sensors mad matroska mmx mmxext modules mpi mpich2 multilib mysql ncurses nfs nls nptl nptlonly nscd nsplugin ntfsprogs ocr ogg opengl openmp pam parport pcre pdf perl php png policykit polkit ppds pppd python qt3support readline rendering resolvconf scanner seccomp server session slideshow sndfile sqlite sse sse2 sse3 sse4_1 sse4_2 ssl ssse3 suexec svg syslog tcl tcpd threads tiff tk truetype udev unicode usb v4l v4l2 vim-syntax vnc wavpack wifi x11 xattr xcb xml xorg xrandr xv xvid xvmc zlib" ABI_X86="64 32" 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" APACHE2_MODULES="alias authz_host auth_basic auth_digest cgi cgid deflate dir env filter include info mem_cache mime mime_magic negotiation remoteip setenvif status userdir vhost_alias rewrite usertrack cache file_cache disk_cache charset_lite log_config log_forensic" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" DRACUT_MODULES="crypt crypt-gpg" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="pc" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en en_US en_GB cs cz" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_5" RUBY_TARGETS="ruby20 ruby21" USERLAND="GNU" VIDEO_CARDS="vesa vmware fbdev intel i915 i965" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" USE_PYTHON="2.7" Unset: CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
