Using clang version 14.0.5 and ld.lld version LLD 14.0.5 (compatible with GNU linkers), package fails to build when '-flto=thin' is added to CFLAGS. Reproducible: Always Steps to Reproduce: 1. follow https://wiki.gentoo.org/wiki/Clang#Link-time_optimizations_with_Clang 2. Enable LTO using -flto=thin 3. Attempt to build package 4. Observe build failure Actual Results: package fails to build Expected Results: package builds successfully. Portage 3.0.30 (python 3.9.13-final-0, default/linux/amd64/17.1/desktop, gcc-11.3.0, glibc-2.35-r7, 5.18.2-gentoo x86_64) ================================================================= System uname: Linux-5.18.2-gentoo-x86_64-Intel-R-_Core-TM-_i7-4771_CPU_@_3.50GHz-with-glibc2.35 KiB Mem: 32557860 total, 16475372 free KiB Swap: 2097148 total, 2097148 free Timestamp of repository gentoo: Sat, 18 Jun 2022 11:17:58 +0000 Head commit of repository gentoo: 10b5536dbd7cb80d8361b278068a94aaf579403c Timestamp of repository brother-overlay: Wed, 08 Jun 2022 00:33:02 +0000 Head commit of repository brother-overlay: e5d2ebd754627638211575780ae3fef06dba4971 Head commit of repository magpie: 9bfed877e5190207efcaf3a0bc3d327977559d67 sh bash 5.1_p16 ld GNU ld (Gentoo 2.38 p4) 2.38 app-misc/pax-utils: 1.3.4::gentoo app-shells/bash: 5.1_p16::gentoo dev-java/java-config: 2.3.1::gentoo dev-lang/perl: 5.36.0::gentoo dev-lang/python: 3.9.13::gentoo, 3.10.5::gentoo, 3.11.0_beta3::gentoo dev-lang/rust: 1.61.0-r1::gentoo dev-util/cmake: 3.23.2::gentoo dev-util/meson: 0.62.2::gentoo sys-apps/baselayout: 2.8::gentoo sys-apps/openrc: 0.45.1::gentoo sys-apps/sandbox: 2.29::gentoo sys-devel/autoconf: 2.13-r1::gentoo, 2.71-r1::gentoo sys-devel/automake: 1.16.5::gentoo sys-devel/binutils: 2.38-r2::gentoo sys-devel/binutils-config: 5.4.1::gentoo sys-devel/clang: 14.0.5::gentoo sys-devel/gcc: 11.3.0::gentoo sys-devel/gcc-config: 2.5-r1::gentoo sys-devel/libtool: 2.4.7::gentoo sys-devel/lld: 14.0.5::gentoo sys-devel/llvm: 14.0.5::gentoo sys-devel/make: 4.3::gentoo sys-kernel/linux-headers: 5.18-r1::gentoo (virtual/os-headers) sys-libs/glibc: 2.35-r7::gentoo Repositories: gentoo location: /var/db/repos/gentoo sync-type: git sync-uri: https://github.com/gentoo-mirror/gentoo.git priority: -1000 sync-git-verify-commit-signature: true brother-overlay location: /var/db/repos/brother-overlay sync-type: git sync-uri: https://github.com/gentoo-mirror/brother-overlay.git masters: gentoo magpie location: /var/db/repos/magpie sync-type: git sync-uri: https://github.com/nvinson/magpie.git masters: gentoo ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA" AR="llvm-ar" CBUILD="x86_64-pc-linux-gnu" CC="clang" CFLAGS="-march=native -O2 -pipe -D_FORTIFY_SOURCE=2 -fstack-protector-strong -flto=thin" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /opt/brother/scanner/brscan4/brsanenetdevice4.cfg /usr/lib64/libreoffice/program/sofficerc /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" CXX="clang++" CXXFLAGS="-march=native -O2 -pipe -D_FORTIFY_SOURCE=2 -fstack-protector-strong -flto=thin" DISTDIR="/var/cache/portage/distfiles" EMERGE_DEFAULT_OPTS="--quiet-build" 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=native -O2 -pipe" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs binpkg-multi-instance buildpkg-live 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=native -O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="en_US.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed -fuse-ld=lld -rtlib=compiler-rt -unwindlib=libunwind" MAKEOPTS="-j8" NM="llvm-nm" 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" RANLIB="llvm-ranlib" SHELL="/bin/zsh" USE="X a52 aac acl acpi alsa amd64 branding bzip2 cairo cdda cdr clang cleartype cli corefonts crypt cups dbus dri dts dvd dvdr elogind encode exif flac fortran gdbm gif glamor gpm gtk gui iconv icu ipv6 jpeg lcms libglvnd libnotify libtirpc mad mng mp3 mp4 mpeg multilib ncurses nls nptl ogg opengl openmp pam pango pcre pdf png policykit ppds qt5 readline sdl seccomp spell split-usr ssl startup-notification svg theora tiff truetype udev udisks unicode upower usb vaapi vorbis vpx wxwidgets x264 xattr xcb xml xv xvid zlib" ABI_X86="64" ADA_TARGET="gnat_2020" 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 avx2 fma3 mmx mmxext popcnt sse sse2 sse3 sse4 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" INPUT_DEVICES="libinput" KERNEL="linux" L10N="en-US en" 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="php7-4 php8-0" POSTGRES_TARGETS="postgres12 postgres13" PYTHON_SINGLE_TARGET="python3_9" PYTHON_TARGETS="python3_9" RUBY_TARGETS="ruby27" USERLAND="GNU" VIDEO_CARDS="intel i965" 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: ADDR2LINE, ARFLAGS, AS, ASFLAGS, CCLD, CONFIG_SHELL, CPP, CPPFLAGS, CTARGET, CXXFILT, ELFEDIT, EXTRA_ECONF, F77FLAGS, FC, GCOV, GPROF, INSTALL_MASK, LC_ALL, LD, LEX, LFLAGS, LIBTOOL, LINGUAS, MAKE, MAKEFLAGS, OBJCOPY, OBJDUMP, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, READELF, RUSTFLAGS, SIZE, STRINGS, STRIP, YACC, YFLAGS Reproducible: Always
Created attachment 786161 [details] build.log
Created attachment 786164 [details] fuse-3.11.0.ebuild updated ebuild that replaces -flto=thin with -flto as pciutils builds when -flto is set.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=5171d41e43c3f8e7015399e5a8f9158a430596b2 commit 5171d41e43c3f8e7015399e5a8f9158a430596b2 Author: Sam James <sam@gentoo.org> AuthorDate: 2023-01-14 16:17:05 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2023-01-14 16:17:30 +0000 sys-fs/fuse: filter-lto As usual, needing thin is a sign that something is wrong, and it may be unsafe at runtime if it even builds. Closes: https://bugs.gentoo.org/853058 Signed-off-by: Sam James <sam@gentoo.org> sys-fs/fuse/{fuse-3.13.0.ebuild => fuse-3.13.0-r1.ebuild} | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
Created attachment 848463 [details] synthetic for no-lto vs lto package file size gcc lto working fine here; smaller size as expected here.
(In reply to CaptainBlood from comment #4) > Created attachment 848463 [details] > synthetic for no-lto vs lto package file size > > gcc lto working fine here; > smaller size as expected here. I'm not sure what your point is. They clearly don't do symbol versioning correctly, hence unsafe and can't be relied on. If you want to use it at your own risk, go wild.
