My Musl AMD64 seems to fail to build with -flto enabled yet works fine if filtered out. I can see the GentooLTO community run into this in 2019 and applied the filter however I can't see that looked into solving it first so don't want to jump to conclusions. Reproducible: Always Steps to Reproduce: 1. Add -flto to cflags 2. emerge musl 3. Fail Actual Results: See build.log The only information on LTO musl working comes from a 9 year old openwrt post but I was unable to find anything else on the subject.
Portage 3.0.38.1 (python 3.10.8-final-0, default/linux/amd64/17.0/musl, gcc-12.2.0, musl-1.2.3-r4, 5.19.11-gentoo-x86_64 x86_64) ================================================================= System uname: Linux-5.19.11-gentoo-x86_64-x86_64-Intel-R-_Core-TM-_i5-5300U_CPU_@_2.30GHz-with-libc KiB Mem: 8018436 total, 2921740 free KiB Swap: 0 total, 0 free Timestamp of repository gentoo: Sun, 16 Oct 2022 17:00:01 +0000 Head commit of repository gentoo: c41b4efc1125ff985ca7b44aebe2b309e783a918 Timestamp of repository musl: Sat, 15 Oct 2022 17:49:05 +0000 Head commit of repository musl: b7cb287ba8a02c7610135e7fbb3fe05ad9b3081f sh bash 5.1_p16-r2 ld GNU ld (Gentoo 2.38 p4) 2.38 app-misc/pax-utils: 1.3.5::gentoo app-shells/bash: 5.1_p16-r2::gentoo dev-lang/perl: 5.36.0::gentoo dev-lang/python: 3.10.8::gentoo, 3.11.0_rc2::gentoo dev-lang/rust: 1.64.0-r1::gentoo dev-util/cmake: 3.24.2::gentoo dev-util/meson: 0.63.2-r1::gentoo sys-apps/baselayout: 2.9::gentoo sys-apps/openrc: 0.45.2::gentoo sys-apps/sandbox: 2.29::gentoo sys-devel/autoconf: 2.13-r3::gentoo, 2.71-r4::gentoo sys-devel/automake: 1.16.5::gentoo sys-devel/binutils: 2.38-r2::gentoo, 2.39-r2::gentoo sys-devel/binutils-config: 5.4.1::gentoo sys-devel/clang: 14.0.6-r1::gentoo, 15.0.1::gentoo sys-devel/gcc: 11.3.0::gentoo, 12.2.0::gentoo sys-devel/gcc-config: 2.8::gentoo sys-devel/libtool: 2.4.7::gentoo sys-devel/llvm: 14.0.6-r2::gentoo, 15.0.1::gentoo sys-devel/make: 4.3::gentoo sys-kernel/linux-headers: 6.0::gentoo (virtual/os-headers) sys-libs/musl: 1.2.3-r4::gentoo Repositories: gentoo location: /var/db/repos/gentoo sync-type: rsync sync-uri: rsync://rsync.gentoo.org/gentoo-portage priority: -1000 sync-rsync-verify-metamanifest: yes sync-rsync-verify-max-age: 24 sync-rsync-extra-opts: sync-rsync-verify-jobs: 1 musl location: /var/db/repos/musl sync-type: git sync-uri: https://github.com/gentoo-mirror/musl.git masters: gentoo ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-gentoo-linux-musl" CFLAGS="-march=broadwell -O2 -pipe -fgraphite-identity -floop-nest-optimize -flto=4 -fuse-linker-plugin -falign-functions=32" CHOST="x86_64-gentoo-linux-musl" CONFIG_PROTECT="/etc /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" CXXFLAGS="-march=broadwell -O2 -pipe -fgraphite-identity -floop-nest-optimize -flto=4 -fuse-linker-plugin -falign-functions=32" DISTDIR="/var/cache/distfiles" 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 XDG_STATE_HOME" FCFLAGS="-march=broadwell -O2 -pipe -fgraphite-identity -floop-nest-optimize -flto=4 -fuse-linker-plugin -falign-functions=32" 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 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=broadwell -O2 -pipe -fgraphite-identity -floop-nest-optimize -flto=4 -fuse-linker-plugin -falign-functions=32" GENTOO_MIRRORS="http://distfiles.gentoo.org" INSTALL_MASK="charset.alias /usr/share/locale/locale.alias" LANG="C.UTF8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j4" 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" RUSTFLAGS="-C target-cpu=native" SHELL="/bin/bash" USE="X acl amd64 bluetooth bzip2 cairo cli crypt d3d9 dbus dri elogind fortran gif gnome-keyring graphite gtk iconv ipv6 libglvnd libtirpc logrotate lto ncurses networkmanager nls nptl openmp pam pcre pgo pulseaudio readline seccomp spell split-usr ssl startup-notification test-rust udisks unicode vulkan xattr 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="mmx mmxext sse sse2" ELIBC="musl" 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 en-GB" 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_10" PYTHON_TARGETS="python3_10" RUBY_TARGETS="ruby27" USERLAND="GNU" VIDEO_CARDS="intel" 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, AR, ARFLAGS, AS, ASFLAGS, CC, CCLD, CONFIG_SHELL, CPP, CPPFLAGS, CTARGET, CXX, CXXFILT, ELFEDIT, EMERGE_DEFAULT_OPTS, EXTRA_ECONF, F77FLAGS, FC, GCOV, GPROF, LC_ALL, LD, LEX, LFLAGS, LIBTOOL, LINGUAS, MAKE, MAKEFLAGS, NM, OBJCOPY, OBJDUMP, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, RANLIB, READELF, SIZE, STRINGS, STRIP, YACC, YFLAGS
Created attachment 824473 [details] build.log
This doesn't look like type mismatch as the main issue necessarily, but: /usr/lib/gcc/x86_64-gentoo-linux-musl/12.2.0/../../../../x86_64-gentoo-linux-musl/bin/ld: /var/tmp/portage/sys-libs/musl-1.2.3-r4/temp/ccnLgfge.ltrans0.ltrans.o: in function `_dlstart': <artificial>:(.text+0x12): undefined reference to `_dlstart_c' collect2: error: ld returned 1 exit status make: *** [Makefile:162: lib/libc.so] Error 1
I was looking at that however I've not seen anything that points to why that variable is defined with lto disabled but not when it is. I'll test in a clang build later on just to see if it gives me anymore infoamtion.
Created attachment 824475 [details] Clang error Well the issue is still there but I feel like this could be giving more clues.
On advice from #musl I have submitted a PR to filter lto as this is the correct solution.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=f44d1becbe468a4e1c36a4819a6276b9ee0c9da2 commit f44d1becbe468a4e1c36a4819a6276b9ee0c9da2 Author: Ian Jordan <immoloism@gmail.com> AuthorDate: 2022-10-17 18:44:08 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2022-10-17 20:31:10 +0000 sys-libs/musl: Filter LTO After discussing my bug with dalias on #musl I was informed that LTO has a negative impact on Musl so fixing the issue I highlight rather than filtering wouldn't be the desired outcome for the user. This will also help crossdev users as a bonus as -flto applies to the crosstoolchain and can be hard to spot at first. Chat log to comfirm: immolo: I ran into the -flto issue while testing musl built with lto and the only thing I can find on it was a workaround in 2015. immolo: My question though is it even worth having lto enabled on musl in the first place as every distro just seems to filter it so there must be a reason dalias: not only is it not worth it. it's negative value dalias: makes musl larger and slower dalias: if you wanted libc.a to get LTO'd into static programs, that might have some value dalias: but LTO on libc.so is worse than worthless Closes: https://bugs.gentoo.org/877343 Thanks-to: dalias Signed-off-by: Ian Jordan <immoloism@gmail.com> Closes: https://github.com/gentoo/gentoo/pull/27824 Signed-off-by: Sam James <sam@gentoo.org> sys-libs/musl/musl-1.2.2-r8.ebuild | 1 + sys-libs/musl/musl-1.2.3-r4.ebuild | 1 + sys-libs/musl/musl-1.2.3.ebuild | 1 + sys-libs/musl/musl-9999.ebuild | 1 + 4 files changed, 4 insertions(+)
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=286463897801758ffa517870a5cf2b38cadd711b commit 286463897801758ffa517870a5cf2b38cadd711b Author: Ian Jordan <immoloism@gmail.com> AuthorDate: 2023-05-08 21:51:19 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2023-05-09 11:37:54 +0000 sys-libs/musl: Reapply filter-lto As strip-flags no longer removes -flto then a filter-lto is now required to prevent bug 877343 from reopening, like has already been applied to sys-libs/glibc. Closes: https://bugs.gentoo.org/877343 Closes: https://github.com/gentoo/gentoo/pull/30942 Signed-off-by: Sam James <sam@gentoo.org> sys-libs/musl/musl-1.2.3-r7.ebuild | 2 +- sys-libs/musl/musl-1.2.3-r8.ebuild | 2 +- sys-libs/musl/musl-1.2.3.ebuild | 4 ++-- sys-libs/musl/musl-1.2.4.ebuild | 2 +- sys-libs/musl/musl-9999.ebuild | 2 +- 5 files changed, 6 insertions(+), 6 deletions(-)