Your message dated Thu, 22 Sep 2022 23:13:51 +0000
with message-id <e1obvob-00exa9...@fasolo.debian.org>
and subject line Bug#996598: fixed in glibc 2.36-1
has caused the Debian Bug report #996598,
regarding [ld][glibc]: Adopt SHT_RELR/DT_RELR to decrease PIE and shared object
size
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
996598: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=996598
Debian Bug Tracking System
Contact ow...@bugs.debian.org with problems
--- Begin Message ---
Source: glibc
Severity: wishlist
Tags: upstream
X-Debbugs-Cc: sylves...@debian.org
The SHT_RELR/DT_RELR format encodes relative relocations in a very efficient
way (quite usually takes just 3% or smaller space).
The size optimization can greatly decrease the virtual memory size of PIE and
shared objects with many R_*_RELATIVE relocations.
E.g. The clang executable's virtual memory size is 8.2% smaller with
SHT_RELR/DT_RELR. The size varies across projects, but I anticipate at least 5%
decrease for most projects.
% ~/projects/bloaty/Release/bloaty clang.pie.relr -- clang.pie
FILE SIZE VM SIZE
-------------- --------------
[NEW] +163Ki [NEW] +163Ki .relr.dyn
+4.9% +32 +5.4% +32 .dynamic
+2.5% +8 [ = ] 0 .shstrtab
-99.5% -13.8Mi -99.5% -13.8Mi .rela.dyn
-8.3% -13.6Mi -8.2% -13.6Mi TOTAL
The SHT_RELR/DT_RELR relocation format requires linker and loader support.
* On the linkder side, ld.lld has supported .relr.dyn/SHT_RELR/DT_RELR
(`--pack-dyn-relocs=relr`) for a long time and the support has been stable
since 2019-09 (after I fixed an address oscillating bug).
* On the loader (glibc ld.so) side, a patch exists
https://sourceware.org/pipermail/libc-alpha/2021-October/131768.html
but lack of GNU ld support may impede its adoption among Linux distributions.
User support is also important to push the patch forward. (ia64 according to
folks isn't an issue. glibc doesn't implement ELFCLASS32 for ia64 AFAICT.)
(
Worth noting that the Linux kernel's arm64 port supports SHT_RELR/DT_RELR since
2019.
ChromeOS has maintained a local glibc patch since around 2018.)
So I file this ticket seeking for support (comment on
https://sourceware.org/bugzilla/show_bug.cgi?id=27924). I hope that with
sufficient attention from users,
someone (e.g. a GNU ld maintainer) will eventually stand up and implement
`--pack-dyn-relocs=relr` for GNU ld
(https://sourceware.org/bugzilla/show_bug.cgi?id=27923).
Even in the absence of GNU ld support, I hope glibc can accept the DT_RELR
patch, so that ld.lld users can use `--pack-dyn-relocs=relr`.
See also Gentoo: https://bugs.gentoo.org/818376 Fedora:
https://bugzilla.redhat.com/show_bug.cgi?id=2014699 Arch Linux:
https://bugs.archlinux.org/task/72433
--- End Message ---
--- Begin Message ---
Source: glibc
Source-Version: 2.36-1
Done: Aurelien Jarno <aure...@debian.org>
We believe that the bug you reported is fixed in the latest version of
glibc, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to 996...@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Aurelien Jarno <aure...@debian.org> (supplier of updated glibc package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmas...@ftp-master.debian.org)
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Thu, 22 Sep 2022 22:23:11 +0200
Source: glibc
Architecture: source
Version: 2.36-1
Distribution: experimental
Urgency: medium
Maintainer: GNU Libc Maintainers <debian-glibc@lists.debian.org>
Changed-By: Aurelien Jarno <aure...@debian.org>
Closes: 781715 996598 1004577
Changes:
glibc (2.36-1) experimental; urgency=medium
.
[ Aurelien Jarno ]
* New upstream release:
- Support for DT_RELR relative relocation format has been added. Closes:
#996598.
- The Linux kernel version check has been removed. Closes: #781715,
#1004577.
- debian/symbols.wildcard: add 2.36 and GLIBC_ABI_DT_RELR.
- debian/patches/localedata/sort-UTF8-first.diff: rebased.
- debian/patches/localedata/supported.diff: rebased.
- debian/patches/arm/unsubmitted-ldso-multilib.diff: rebased.
- debian/patches/hurd-i386/git-spawni-reauth.diff: upstreamed.
- debian/patches/hurd-i386/pthread_key.diff: upstreamed.
- debian/patches/kfreebsd/submitted-waitid.diff: dropped. kfreebsd
specific changes moved to debian/patches/kfreebsd/local-sysdeps.diff.
- debian/patches/kfreebsd/local-config_h_in.patch: rebased.
- debian/patches/kfreebsd/local-getaddrinfo-freebsd-kernel.diff: rebased.
- debian/patches/all/local-remove-manual.diff: rebased.
- debian/patches/any/local-ldso-disable-hwcap.diff: rebased.
- debian/patches/any/unsubmitted-ldso-machine-mismatch.diff: rebased.
- debian/patches/any/submitted-resolv-unaligned.diff: upstreamed.
- debian/patches/hurd-i386/local-fix-nss.diff: rebased.
- debian/patches/hurd-i386/local-no-bootstrap-fs-access.2.diff: rebased.
.
[ Samuel Thibault ]
* debian/testsuite-xfail-debian.mk: Update tests results for hurd-i386.
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