Trying to build dev-python/libvirt-python-6.2.0 with GCC 10.1 with the -flto useflag causes GCC to throw an internal compiler error, specifically: lto1: internal compiler error: resolution sub id 0xc7f780b4a6860cd3 not in object file Reproducible: Always Steps to Reproduce: 1. Add -flto to CFLAGS and CXXFLAGS 2. emerge -1 libvirt-python Actual Results: lto1: internal compiler error: resolution sub id 0xc7f780b4a6860cd3 not in object file x86_64-pc-linux-gnu-gcc -march=ivybridge -pipe -fomit-frame-pointer -O2 -flto -fPIC -I. -I/usr/include/python3.8 -c build/libvirt.c -o /tmp/portage/dev-python/libvirt-python-6.5.0/work/libvirt-python-6.5.0-python3_8/temp.linux-x86_64-3.8/build/libvirt.o 0x7f07f1b3ed59 __libc_start_main ../csu/libc-start.c:308 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://bugs.gentoo.org/> for instructions. lto-wrapper: fatal error: x86_64-pc-linux-gnu-gcc returned 1 exit status compilation terminated. /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/../../../../x86_64-pc-linux-gnu/bin/ld: error: lto-wrapper failed collect2: error: ld returned 1 exit status Expected Results: emerge success. I've added -flto to my CXXFLAGS and CFLAGS, and I am slowly letting programs update themselves to use LTO if possible (if not, I'm using -fno-lto in an an env configuration in package.env to disable it for those problematic ones). For my use case I can disable LTO for libvirt-python (which builds in that case), but I wanted to report this bug as it is causing GCC to ICE when linking a shared object. Should I rebuild GCC with debugging symbols and -fno-omit-frame-pointer (I'm also building with -fomit-frame-pointer)? Let me know if you need any more information or if you'd like for me to test changing flags around. Here's my emerge --info: Portage 3.0.0 (python 3.7.8-final-0, default/linux/amd64/17.1/desktop/plasma, gcc-10.1.0, glibc-2.31-r6, 5.7.9-gentoo x86_64) ================================================================= System uname: Linux-5.7.9-gentoo-x86_64-Intel-R-_Core-TM-_i7-3770K_CPU_@_3.50GHz-with-gentoo-2.7 KiB Mem: 16351848 total, 11129284 free KiB Swap: 16776192 total, 16233984 free Timestamp of repository gentoo: Wed, 22 Jul 2020 15:45:01 +0000 Head commit of repository gentoo: eccde0ca97c9665973ebe134452751468be1e877 sh bash 5.0_p18 ld GNU ld (Gentoo 2.34 p4) 2.34.0 distcc 3.3.3 x86_64-pc-linux-gnu [disabled] ccache version 3.7.11 [disabled] app-shells/bash: 5.0_p18::gentoo dev-java/java-config: 2.3.1::gentoo dev-lang/perl: 5.30.3-r1::gentoo dev-lang/python: 2.7.18-r1::gentoo, 3.7.8-r2::gentoo, 3.8.5::gentoo, 3.9.0_beta5::gentoo dev-util/ccache: 3.7.11::gentoo dev-util/cmake: 3.17.3::gentoo dev-util/pkgconfig: 0.29.2::gentoo sys-apps/baselayout: 2.7::gentoo sys-apps/openrc: 0.42.1::gentoo sys-apps/sandbox: 2.20::gentoo sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r5::gentoo sys-devel/automake: 1.16.2::gentoo sys-devel/binutils: 2.34-r1::gentoo sys-devel/gcc: 10.1.0-r2::gentoo sys-devel/gcc-config: 2.3.1::gentoo sys-devel/libtool: 2.4.6-r6::gentoo sys-devel/make: 4.3::gentoo sys-kernel/linux-headers: 5.7::gentoo (virtual/os-headers) sys-libs/glibc: 2.31-r6::gentoo Repositories: gentoo location: /var/db/repos/gentoo sync-type: rsync sync-uri: rsync://rsync.us.gentoo.org/gentoo-portage priority: -1000 sync-rsync-extra-opts: sync-rsync-verify-max-age: 24 sync-rsync-verify-jobs: 1 sync-rsync-verify-metamanifest: yes Local_Overlay location: /var/db/repos/local masters: gentoo eclass-overrides: gentoo Local_Overlay crossdev location: /var/db/repos/crossdev masters: gentoo eclass-overrides: gentoo crossdev brother-overlay location: /var/lib/layman/brother-overlay masters: gentoo priority: 50 chrytoo location: /var/lib/layman/chrytoo masters: gentoo priority: 50 ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="@FREE" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=ivybridge -pipe -fomit-frame-pointer -O2 -flto" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /opt/brother/scanner/brscan4/brsanenetdevice4.cfg /usr/lib64/libreoffice/program/sofficerc /usr/share/config /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /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" CXXFLAGS="-march=ivybridge -pipe -fomit-frame-pointer -O2 -flto" DISTDIR="/var/cache/distfiles" ENV_UNSET="DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR" FCFLAGS="-march=ivybridge -pipe -fomit-frame-pointer -O2 -flto" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs clean-logs config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch pid-sandbox preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms split-log strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-march=ivybridge -pipe -fomit-frame-pointer -O2 -flto" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="en_US.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" LINGUAS="en es" MAKEOPTS="-j9" PKGDIR="/var/cache/binpkgs" 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="/tmp" USE="=-ppp X a52 aac acl acpi activities alsa amd64 avx bash-completion berkdb bluetooth branding bzip2 cairo cdda cdr cli crypt cups dbus declarative dri dts dvd dvdr elogind emboss encode exif flac fortran gdbm gif gpm gtk iconv icu ipv6 jpeg kde kipi kwallet lcms ldap libnotify libtirpc lm-sensors lto mad mmx mng mp3 mp4 mpeg mtp multilib ncurses nls nptl nvidia ogg opengl openmp pam pango pcre pdf phonon plasma png policykit ppds pulseaudio qml qt qt5 readline sdl seccomp semantic-desktop spell split-usr sse sse2 sse3 sse4 ssl startup-notification svg tcpd tiff truetype udev udisks unicode upower usb vdpau vorbis widgets wxwidgets x264 xattr xcb xml xv xvid zlib" ABI_X86="64" ADA_TARGET="gnat_2018" 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="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 speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon sheets words" 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" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="efi-64 emu" INPUT_DEVICES="evdev roccat_tyon" KERNEL="linux" L10N="en es" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-2 php7-3" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_7" PYTHON_TARGETS="python2_7 python3_7 python3_7 python3_8" RUBY_TARGETS="ruby25" SANE_BACKENDS="test" USERLAND="GNU" VIDEO_CARDS="nvidia" 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" Unset: CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
Crap, sorry, I noticed a typo in the title. I meant libvirt-python-6.5.0, not 6.2.0. I'll upload the build log momentarily...
Created attachment 650250 [details] build.log showing ICE This is the build log showing the ICE. Let me know if you need more information from me or need more information about my computer/environment to reproduce.
(In reply to Gabriel Marcano from comment #2) > Created attachment 650250 [details] > build.log showing ICE > > This is the build log showing the ICE. Let me know if you need more > information from me or need more information about my computer/environment > to reproduce. Could you have a look at: https://wiki.gentoo.org/wiki/Gcc-ICE-reporting-guide?
GCC just updated to 10.2 yesterday, and since then I'm no longer able to reproduce the problem reliably. I had it crash once today after the GCC upgrade, but ever since I began playing with MAKEOPTS to see what would happen (changing -jN), I can't reproduce it anymore, even with the original values for the number of jobs (maybe it's a weird race condition that's rarer now?). Other than that one failure earlier today, I can confirm it is building with -flto now. As a result, I will close this bug unless I can reproduce it again (I've re-emerged it 4 times already in a row, successfully).
