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[SOLVED] Problem emerging due to GLIBCXX?

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tinman237
n00b
n00b

Joined: 13 May 2021
Posts: 3

Posted: Thu May 13, 2021 10:03 pm Post subject: [SOLVED] Problem emerging due to GLIBCXX?

Hey everyone, I'm new to Gentoo and this is the first problem I've had when updating my system.

Here is the emerge info for libmspub

Code:

emerge --info '=app-text/libmspub-0.1.4::gentoo'
Portage 3.0.18 (python 3.8.10-final-0, default/linux/amd64/17.1/desktop/plasma, gcc-10.3.0, glibc-2.33, 5.12.0-gentoo x86_64)
=================================================================
System Settings
=================================================================
System uname: Linux-5.12.0-gentoo-x86_64-AMD_Ryzen_5_3600X_6-Core_Processor-with-glibc2.2.5
KiB Mem: 16401252 total, 3281800 free
KiB Swap: 0 total, 0 free
Timestamp of repository gentoo: Sun, 09 May 2021 17:00:01 +0000
Head commit of repository gentoo: 859865c7a94745bc9b21e400060940bc89b00961
sh bash 5.1_p8
ld GNU ld (Gentoo 2.36.1 p3) 2.36.1
app-shells/bash: 5.1_p8::gentoo
dev-lang/perl: 5.32.1::gentoo
dev-lang/python: 2.7.18_p9::gentoo, 3.8.10::gentoo, 3.9.5::gentoo
dev-lang/rust: 1.52.0::gentoo
dev-util/cmake: 3.20.2::gentoo
sys-apps/baselayout: 2.7-r2::gentoo
sys-apps/openrc: 0.42.1-r1::gentoo
sys-apps/sandbox: 2.24::gentoo
sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r5::gentoo
sys-devel/automake: 1.16.3-r1::gentoo
sys-devel/binutils: 2.36.1-r1::gentoo
sys-devel/gcc: 10.3.0::gentoo, 11.1.0::gentoo
sys-devel/gcc-config: 2.4::gentoo
sys-devel/libtool: 2.4.6-r6::gentoo
sys-devel/make: 4.3::gentoo
sys-kernel/linux-headers: 5.12::gentoo (virtual/os-headers)
sys-libs/glibc: 2.33::gentoo
Repositories:

gentoo
location: /var/db/repos/gentoo
sync-type: rsync
sync-uri: rsync://rsync.gentoo.org/gentoo-portage
priority: -1000
sync-rsync-verify-jobs: 1
sync-rsync-extra-opts:
sync-rsync-verify-max-age: 24
sync-rsync-verify-metamanifest: yes

anders-larsson
location: /var/lib/layman/anders-larsson
sync-type: laymansync
sync-uri: https://github.com/anders-larsson/gentoo-overlay.git
masters: gentoo
priority: 50

plex-overlay
location: /var/lib/layman/plex-overlay
sync-type: laymansync
sync-uri: https://github.com/comio/plex-overlay.git
masters: gentoo
priority: 50

steam-overlay
location: /var/lib/layman/steam-overlay
sync-type: laymansync
sync-uri: https://github.com/anyc/steam-overlay.git
masters: gentoo
priority: 50

ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="@FREE"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=znver2 -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /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/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-march=znver2 -O2 -pipe"
DISTDIR="/var/cache/distfiles"
EMERGE_DEFAULT_OPTS="--jobs=6 --load-average=7"
ENV_UNSET="CARGO_HOME 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=znver2 -O2 -pipe"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-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 strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-march=znver2 -O2 -pipe"
GENTOO_MIRRORS="http://www.gtlib.gatech.edu/pub/gentoo https://gentoo.osuosl.org/ https://mirrors.rit.edu/gentoo/ https://mirror.sjc02.svwh.net/gentoo/ http://mirror.lug.udel.edu/pub/gentoo/"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j6 -l7"
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="/var/tmp"
USE="X aac acl acpi activities alsa amd64 berkdb bluetooth branding bzip2 cairo cdda cdr cli crypt cups dbus declarative dri dts dvd dvdr elogind encode exif firmware flac fortran gdbm gif gpm gtk gui iconv icu ipv6 jpeg kde kipi kwallet lcms libglvnd libnotify libtirpc mad mng mp3 mp4 mpeg multilib ncurses nptl nvidia ogg opengl openmp pam pango pcre pdf phonon plasma png policykit ppds qml qt5 readline sdl seccomp semantic-desktop spell split-usr ssl startup-notification svg tcpd tiff tk truetype udev udisks unicode upower usb 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="mmx mmxext sse sse2" 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" INPUT_DEVICES="evdev keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-3 php7-4" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_8" PYTHON_TARGETS="python3_8" RUBY_TARGETS="ruby26" USERLAND="GNU" VIDEO_CARDS="nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq proto steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset: CC, CPPFLAGS, CTARGET, CXX, INSTALL_MASK, LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, RUSTFLAGS

=================================================================
Package Settings
=================================================================

app-text/libmspub-0.1.4::gentoo was built with the following:
USE="-doc -static-libs" ABI_X86="(64)"
CXXFLAGS="-march=znver2 -O2 -pipe -std=c++14"

and for libcdr

Code:

emerge --info '=media-libs/libcdr-0.1.7::gentoo'
Portage 3.0.18 (python 3.8.10-final-0, default/linux/amd64/17.1/desktop/plasma, gcc-10.3.0, glibc-2.33, 5.12.0-gentoo x86_64)
=================================================================
System Settings
=================================================================
System uname: Linux-5.12.0-gentoo-x86_64-AMD_Ryzen_5_3600X_6-Core_Processor-with-glibc2.2.5
KiB Mem: 16401252 total, 3277100 free
KiB Swap: 0 total, 0 free
Timestamp of repository gentoo: Sun, 09 May 2021 17:00:01 +0000
Head commit of repository gentoo: 859865c7a94745bc9b21e400060940bc89b00961
sh bash 5.1_p8
ld GNU ld (Gentoo 2.36.1 p3) 2.36.1
app-shells/bash: 5.1_p8::gentoo
dev-lang/perl: 5.32.1::gentoo
dev-lang/python: 2.7.18_p9::gentoo, 3.8.10::gentoo, 3.9.5::gentoo
dev-lang/rust: 1.52.0::gentoo
dev-util/cmake: 3.20.2::gentoo
sys-apps/baselayout: 2.7-r2::gentoo
sys-apps/openrc: 0.42.1-r1::gentoo
sys-apps/sandbox: 2.24::gentoo
sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r5::gentoo
sys-devel/automake: 1.16.3-r1::gentoo
sys-devel/binutils: 2.36.1-r1::gentoo
sys-devel/gcc: 10.3.0::gentoo, 11.1.0::gentoo
sys-devel/gcc-config: 2.4::gentoo
sys-devel/libtool: 2.4.6-r6::gentoo
sys-devel/make: 4.3::gentoo
sys-kernel/linux-headers: 5.12::gentoo (virtual/os-headers)
sys-libs/glibc: 2.33::gentoo
Repositories:

gentoo
location: /var/db/repos/gentoo
sync-type: rsync
sync-uri: rsync://rsync.gentoo.org/gentoo-portage
priority: -1000
sync-rsync-verify-max-age: 24
sync-rsync-extra-opts:
sync-rsync-verify-jobs: 1
sync-rsync-verify-metamanifest: yes

anders-larsson
location: /var/lib/layman/anders-larsson
sync-type: laymansync
sync-uri: https://github.com/anders-larsson/gentoo-overlay.git
masters: gentoo
priority: 50

plex-overlay
location: /var/lib/layman/plex-overlay
sync-type: laymansync
sync-uri: https://github.com/comio/plex-overlay.git
masters: gentoo
priority: 50

steam-overlay
location: /var/lib/layman/steam-overlay
sync-type: laymansync
sync-uri: https://github.com/anyc/steam-overlay.git
masters: gentoo
priority: 50

ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="@FREE"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=znver2 -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /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/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-march=znver2 -O2 -pipe"
DISTDIR="/var/cache/distfiles"
EMERGE_DEFAULT_OPTS="--jobs=6 --load-average=7"
ENV_UNSET="CARGO_HOME 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=znver2 -O2 -pipe"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-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 strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-march=znver2 -O2 -pipe"
GENTOO_MIRRORS="http://www.gtlib.gatech.edu/pub/gentoo https://gentoo.osuosl.org/ https://mirrors.rit.edu/gentoo/ https://mirror.sjc02.svwh.net/gentoo/ http://mirror.lug.udel.edu/pub/gentoo/"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j6 -l7"
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="/var/tmp"
USE="X aac acl acpi activities alsa amd64 berkdb bluetooth branding bzip2 cairo cdda cdr cli crypt cups dbus declarative dri dts dvd dvdr elogind encode exif firmware flac fortran gdbm gif gpm gtk gui iconv icu ipv6 jpeg kde kipi kwallet lcms libglvnd libnotify libtirpc mad mng mp3 mp4 mpeg multilib ncurses nptl nvidia ogg opengl openmp pam pango pcre pdf phonon plasma png policykit ppds qml qt5 readline sdl seccomp semantic-desktop spell split-usr ssl startup-notification svg tcpd tiff tk truetype udev udisks unicode upower usb 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="mmx mmxext sse sse2" 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" INPUT_DEVICES="evdev keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-3 php7-4" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_8" PYTHON_TARGETS="python3_8" RUBY_TARGETS="ruby26" USERLAND="GNU" VIDEO_CARDS="nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq proto steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset: CC, CPPFLAGS, CTARGET, CXX, INSTALL_MASK, LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, RUSTFLAGS

=================================================================
Package Settings
=================================================================

media-libs/libcdr-0.1.7::gentoo was built with the following:
USE="-doc -test" ABI_X86="(64)"
FEATURES="assume-digests network-sandbox usersync usersandbox sfperms unknown-features-warn ipc-sandbox xattr distlocks fixlafiles merge-sync config-protect-if-modified binpkg-dostrip binpkg-docompress protect-owned sandbox unmerge-logs multilib-strict parallel-fetch news ebuild-locks userpriv userfetch binpkg-logs pid-sandbox preserve-libs qa-unresolved-soname-deps unmerge-orphans strict"

Here is where libmspub failed:

Code:

/usr/lib/gcc/x86_64-pc-linux-gnu/10.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.3.0/../../../../lib64/librevenge-generators-0.0.so: undefined reference to `std::__throw_bad_array_new_length()@GLIBCXX_3.4.29'
collect2: error: ld returned 1 exit status
make[4]: *** [Makefile:442: pub2raw] Error 1
make[4]: Leaving directory '/var/tmp/portage/app-text/libmspub-0.1.4/work/libmspub-0.1.4/src/conv/raw'
make[3]: *** [Makefile:384: all-recursive] Error 1
make[3]: Leaving directory '/var/tmp/portage/app-text/libmspub-0.1.4/work/libmspub-0.1.4/src/conv'
make[2]: *** [Makefile:386: all-recursive] Error 1
make[2]: Leaving directory '/var/tmp/portage/app-text/libmspub-0.1.4/work/libmspub-0.1.4/src'
make[1]: *** [Makefile:492: all-recursive] Error 1
make[1]: Leaving directory '/var/tmp/portage/app-text/libmspub-0.1.4/work/libmspub-0.1.4'
make: *** [Makefile:403: all] Error 2

And here is where libcdr failed:

Code:

/usr/lib/gcc/x86_64-pc-linux-gnu/10.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.3.0/../../../../lib64/librevenge-generators-0.0.so: undefined reference to `std::__throw_bad_array_new_length()@GLIBCXX_3.4.29'
collect2: error: ld returned 1 exit status
make[4]: *** [Makefile:478: cmx2raw] Error 1
make[4]: Leaving directory '/var/tmp/portage/media-libs/libcdr-0.1.7/work/libcdr-0.1.7/src/conv/raw'
make[3]: *** [Makefile:392: all-recursive] Error 1
make[3]: Leaving directory '/var/tmp/portage/media-libs/libcdr-0.1.7/work/libcdr-0.1.7/src/conv'
make[2]: *** [Makefile:395: all-recursive] Error 1
make[2]: Leaving directory '/var/tmp/portage/media-libs/libcdr-0.1.7/work/libcdr-0.1.7/src'
make[1]: *** [Makefile:510: all-recursive] Error 1
make[1]: Leaving directory '/var/tmp/portage/media-libs/libcdr-0.1.7/work/libcdr-0.1.7'
make: *** [Makefile:417: all] Error 2

The problem child seems to be undefined reference to `std::__throw_bad_array_new_length()@GLIBCXX_3.4.29'
My libstdc++ appears to be up-to-date:

Code:

emerge -s libstdc++

[ Results for search key : libstdc++ ]
Searching...

* sys-libs/libstdc++-v3
Latest version available: 3.3.6-r2
Latest version installed: 3.3.6-r2
Size of files: 23,464 KiB
Homepage: https://gcc.gnu.org/libstdc++/
Description: Compatibility package for binaries linked against a pre gcc 3.4 libstdc++
License: GPL-2 LGPL-2.1

Any help would be appreciated. This is my first time on the forums, apologies if I borked up the formatting or provided useless info!

Last edited by tinman237 on Thu May 13, 2021 11:07 pm; edited 1 time in total

tinman237
n00b
n00b

Joined: 13 May 2021
Posts: 3

Posted: Thu May 13, 2021 10:27 pm Post subject:

Code:

gcc-config -l
[1] x86_64-pc-linux-gnu-10.3.0 *
[2] x86_64-pc-linux-gnu-11.1.0

Somehow I was using the wrong version of GCC.

In this case

Code:

# gcc-config 2

solved my problem. Not sure how I missed that.

Ionen
Developer

Joined: 06 Dec 2018
Posts: 2719

Posted: Fri May 14, 2021 7:46 am Post subject:

Yep, if you wanted to go back to gcc10, you'd have to rebuild every packages that used libstdc++. That library is only compatible in a forward direction, notably like how you can't downgrade glibc (many other libraries where it's not safe and may or may not work). Wiki makes a brief mention of it, albeit it's a dated example: https://wiki.gentoo.org/wiki/Upgrading_GCC#libstdc.2B.2B.so.6:_version_.60GLIBCXX_3.4.15.27_not_found

tinman237
n00b
n00b

Joined: 13 May 2021
Posts: 3

Posted: Fri May 14, 2021 3:44 pm Post subject:

Ionen wrote:

Yep, if you wanted to go back to gcc10, you'd have to rebuild every packages that used libstdc++.

That library is only compatible in a forward direction, notably like how you can't downgrade glibc (many other libraries where it's not safe and may or may not work).

Wiki makes a brief mention of it, albeit it's a dated example:
https://wiki.gentoo.org/wiki/Upgrading_GCC#libstdc.2B.2B.so.6:_version_.60GLIBCXX_3.4.15.27_not_found

Ah, I think I will stick to gcc11. :lol:

Code:

sys-devel/gcc-10.3.0::gentoo was built with the following:
USE="(cxx) fortran (multilib) nptl openmp pch (pie) sanitize ssp (-ada) -d -debug -doc (-fixed-point) -go -graphite (-hardened) -jit (-libssp) -lto -nls -objc -objc++ -objc-gc -pgo -systemtap -test -vanilla -vtv -zstd" ABI_X86="(64)"
CFLAGS="-march=znver2 -pipe -O2"
CXXFLAGS="-march=znver2 -pipe -O2"
FEATURES="protect-owned unmerge-orphans network-sandbox unknown-features-warn sandbox ipc-sandbox binpkg-docompress merge-sync pid-sandbox assume-digests fixlafiles binpkg-logs usersync sfperms binpkg-dostrip strict config-protect-if-modified userfetch parallel-fetch preserve-libs ebuild-locks qa-unresolved-soname-deps userpriv unmerge-logs xattr news usersandbox distlocks multilib-strict"

sys-devel/gcc-11.1.0::gentoo was built with the following:
USE="(cxx) fortran (multilib) nptl openmp pch (pie) sanitize ssp (-ada) -custom-cflags -d -debug -doc (-fixed-point) -go -graphite (-hardened) -jit (-libssp) -lto -nls -objc -objc++ -objc-gc -pgo -systemtap -test -valgrind -vanilla -vtv -zstd" ABI_X86="(64)"
CFLAGS="-march=znver2 -pipe -O2"
CXXFLAGS="-march=znver2 -pipe -O2"
FEATURES="ipc-sandbox config-protect-if-modified multilib-strict unmerge-orphans usersync binpkg-docompress merge-sync assume-digests sfperms sandbox fixlafiles userfetch ebuild-locks protect-owned binpkg-logs network-sandbox userpriv news distlocks preserve-libs strict parallel-fetch xattr binpkg-dostrip unknown-features-warn unmerge-logs usersandbox pid-sandbox qa-unresolved-soname-deps"

I'm really unsure on why I had gcc10 selected, I can't see any differences in how I built the two versions that really stands out to me.

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