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bitwisegamgee
n00b
Joined: 12 Jul 2023
Posts: 2
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 Posted: Wed Mar 27, 2024 12:38 pm Post subject: cmake-3.28.3 fails to compile with -flto set |
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Wanted to play with LTO to see if I could squeeze more speed for my VM server, but when cmake came back up to be compiled, it broke it. Disabling lto extensions resolves the problem. Also it seems the form code brackets are broken.
| Code: | emerge --info '=dev-build/cmake-3.28.3::gentoo'
Portage 3.0.61 (python 3.11.8-final-0, default/linux/amd64/23.0, gcc-13, glibc-2.38-r10, 6.6.21-gentoo-dist x86_64)
=================================================================
System Settings
=================================================================
System uname: Linux-6.6.21-gentoo-dist-x86_64-Intel-R-_Core-TM-_i5-9500_CPU_@_3.00GHz-with-glibc2.38
KiB Mem: 16051792 total, 11861484 free
KiB Swap: 0 total, 0 free
Timestamp of repository gentoo: Wed, 27 Mar 2024 12:00:00 +0000
Head commit of repository gentoo: dade4c316607ac87f0ee7182f99aa8d787a36b82
sh bash 5.1_p16-r6
ld GNU ld (Gentoo 2.41 p5) 2.41.0
app-misc/pax-utils: 1.3.7::gentoo
app-shells/bash: 5.1_p16-r6::gentoo
dev-build/autoconf: 2.71-r6::gentoo
dev-build/automake: 1.16.5-r2::gentoo
dev-build/libtool: 2.4.7-r4::gentoo
dev-build/make: 4.4.1-r1::gentoo
dev-build/meson: 1.3.2::gentoo
dev-lang/perl: 5.38.2-r2::gentoo
dev-lang/python: 3.11.8_p1::gentoo, 3.12.2_p1::gentoo
sys-apps/baselayout: 2.14-r2::gentoo
sys-apps/openrc: 0.53.1::gentoo
sys-apps/sandbox: 2.38::gentoo
sys-devel/binutils: 2.41-r5::gentoo
sys-devel/binutils-config: 5.5::gentoo
sys-devel/gcc: 13.2.1_p20240210::gentoo
sys-devel/gcc-config: 2.11::gentoo
sys-kernel/linux-headers: 6.6-r1::gentoo (virtual/os-headers)
sys-libs/glibc: 2.38-r10::gentoo
Repositories:
gentoo
location: /var/db/repos/gentoo
sync-type: rsync
sync-uri: rsync://rsync.gentoo.org/gentoo-portage
priority: -1000
volatile: False
sync-rsync-extra-opts:
sync-rsync-verify-metamanifest: yes
sync-rsync-verify-max-age: 3
sync-rsync-verify-jobs: 1
Binary Repositories:
gentoobinhost
priority: 1
sync-uri: https://distfiles.gentoo.org/releases/amd64/binpackages/23.0/x86-64
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="*"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -march=native -pipe -flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/sandbox.d"
CXXFLAGS="-O2 -march=native -pipe -flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing"
DISTDIR="/var/cache/distfiles"
ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GDK_PIXBUF_MODULE_FILE 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="-O2 -march=native -pipe -flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing"
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 pkgdir-index-trusted preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-O2 -march=native -pipe -flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="C.UTF8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs"
LEX="flex"
MAKEOPTS="-j7"
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"
SHELL="/bin/bash"
USE="acl amd64 bzip2 cet crypt gdbm iconv ipv6 libtirpc lto lzma multilib ncurses nls openmp pam pcre readline seccomp ssl test-rust unicode xattr zfs zlib zstd" ABI_X86="64" ADA_TARGET="gcc_12" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_anon authn_dbm authn_file authz_dbm authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir env expires ext_filter file_cache filter headers include info log_config logio 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 aes avx avx2 f16c fma3 pclmul popcnt rdrand sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 ntrip navcom oceanserver oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 tsip tripmate tnt ublox" INPUT_DEVICES="libinput" KERNEL="linux" LCD_DEVICES="bayrad cfontz glk hd44780 lb216 lcdm001 mtxorb text" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php8-1" POSTGRES_TARGETS="postgres15" PYTHON_SINGLE_TARGET="python3_11" PYTHON_TARGETS="python3_11" RUBY_TARGETS="ruby31" VIDEO_CARDS="intel" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipp2p iface geoip fuzzy condition tarpit sysrq proto 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, INSTALL_MASK, LC_ALL, LD, LFLAGS, LIBTOOL, LINGUAS, MAKE, MAKEFLAGS, NM, OBJCOPY, OBJDUMP, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PYTHONPATH, RANLIB, READELF, RUSTFLAGS, SIZE, STRINGS, STRIP, YACC, YFLAGS
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CaptainBlood
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Joined: 24 Jan 2010
Posts: 3627
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| Posted: Wed Mar 27, 2024 1:01 pm Post subject: |
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ebuild has directive.
I have traces dev-build/cmake has been able to build and run with lto here.
If you really want to build current ebuild with lto, either:
1) remove directive from official ebuild, digest ebuild and try rebuild.
2) derive official to local repository, then proceed like in 1)
| Code: | | quickpkg --include-config y dev-build/cmake |
can help to insure recovery, should things turn really bad.
Thks 4 ur attention, interest & support.
_________________
USE="-* ..." in /etc/portage/make.conf here.
LT: "I've been doing a passable imitation of the Fontana di Trevi, except my medium is mucus. Sooo much mucus. " |
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CaptainBlood
Advocate
Joined: 24 Jan 2010
Posts: 3627
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| Posted: Wed Mar 27, 2024 1:27 pm Post subject: |
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Just proceeded successfully as in 1) here. | Code: | =================================================================
Package Settings
=================================================================
dev-build/cmake-3.28.3::gentoo was built with the following:
USE="-dap -doc -gui ncurses -qt6 -test verify-sig" ABI_X86="(64)"
CFLAGS="-march=core2 -mtune=native -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects -pipe -Wa,-mbranches-within-32B-boundaries"
CXXFLAGS="-march=core2 -mtune=native -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects -pipe -Wa,-mbranches-within-32B-boundaries"
FEATURES="network-sandbox binpkg-multi-instance split-elog multilib-strict preserve-libs fixlafiles pid-sandbox sandbox distlocks pkgdir-index-trusted usersandbox userpriv unknown-features-warn binpkg-docompress binpkg-dostrip userfetch sfperms strict unmerge-orphans qa-unresolved-soname-deps unmerge-logs usersync news compress-build-logs ebuild-locks parallel-fetch protect-owned ipc-sandbox assume-digests binpkg-logs config-protect-if-modified merge-sync buildpkg-live"
LDFLAGS="-Wl,-O1 -Wl,-fuse-ld=bfd" |
Thks 4 ur attention, interest & support.
_________________
USE="-* ..." in /etc/portage/make.conf here.
LT: "I've been doing a passable imitation of the Fontana di Trevi, except my medium is mucus. Sooo much mucus. " |
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logrusx
Veteran
Joined: 22 Feb 2018
Posts: 1535
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| Posted: Wed Mar 27, 2024 1:28 pm Post subject: Re: cmake-3.28.3 fails to compile with -flto set |
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| bitwisegamgee wrote: | | Wanted to play with LTO to see if I could squeeze more speed for my VM server, but when cmake came back up to be compiled, it broke it. Disabling lto extensions resolves the problem. Also it seems the form code brackets are broken. |
It makes no sense and as you yourself have discovered, it creates problems to enable LTO on build tools and compilers. Especially compilers won't produce faster binaries and in the same time I don't see much benefit from LTO on the type of load they're executing.
LTO makes sense on end-user packages like browsers et.c.
Also LTO does not make sense if you have decent hardware.
Best Regards,
Georgi |
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CaptainBlood
Advocate
Joined: 24 Jan 2010
Posts: 3627
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| Posted: Wed Mar 27, 2024 1:48 pm Post subject: |
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Binary size is criteria for lto here.
Some packages inflate, some shrink.
So cherry picking in /etc/portage/package.env here.
A package status in this regard may vary over releases.
This make things complicated to maintain.
Plz note some packages force -flto internally.
Only log bissecting can reveal it.
Undecent hardware here. 
Thks 4 ur attention, interest & support.
_________________
USE="-* ..." in /etc/portage/make.conf here.
LT: "I've been doing a passable imitation of the Fontana di Trevi, except my medium is mucus. Sooo much mucus. " |
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CaptainBlood
Advocate
Joined: 24 Jan 2010
Posts: 3627
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| Posted: Wed Mar 27, 2024 2:41 pm Post subject: |
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| Code: | | LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs" |
You're using lld linker, aren't you?
Could be that lld has # results regarding -flto when compared to gnu ld...
Thks 4 ur attention, interest & support.
_________________
USE="-* ..." in /etc/portage/make.conf here.
LT: "I've been doing a passable imitation of the Fontana di Trevi, except my medium is mucus. Sooo much mucus. " |
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