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Bug#650145: marked as done (dpkg-shlibdeps warning about gcc-added library (LTO))

Your message dated Sat, 05 Jan 2013 13:33:02 +0000
with message-id <E1TrTry-0006vs-BZ@franck.debian.org>
and subject line Bug#650145: fixed in binutils 2.23.1-1~exp4
has caused the Debian Bug report #650145,
regarding dpkg-shlibdeps warning about gcc-added library (LTO)
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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-- 
650145: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650145
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Source: gcc-4.6
Severity: minor

(@Bernhard: /dpkg-shlibdeps: warning: dependency on.*could be avoided.*uselessly linked/)

I’ve just spotted this in the build logs:

dpkg-shlibdeps: warning: dependency on libgcc_s.so.1 could be avoided if "debian/mksh/bin/mksh" were not uselessly linked against it (they use none of its symbols).

This could, by the way, be used in the new checker. Anyway,
thing is, mksh doesn’t use libgcc_s or request any function
from it specifically; the dependency is added by gcc itself
and this should be fixed there.

The link command used is:

gcc -g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat
    -Wformat-security -Werror=format-security -Wall -Wextra
    -fno-strict-aliasing -fstack-protector-all -fwrapv -flto=jobserver
    -std=gnu99 -fPIE -pie -Wl,-z,relro -Wl,-z,now -fuse-linker-plugin
    -o mksh  lalloc.o edit.o eval.o exec.o expr.o funcs.o histrap.o jobs.o
    lex.o main.o misc.o shf.o syn.o tree.o var.o strlcpy.o printf.o

Looking at “gcc -dumpspecs”, I see this though:

*libgcc:
%{static|static-libgcc:-lgcc -lgcc_eh}%{!static:%{!static-libgcc:%{!shared-libgcc:-lgcc --as-needed -lgcc_s --no-as-needed}%{shared-libgcc:-lgcc_s%{!shared: -lgcc}}}}

No explicit -shared-libgcc here (from me, at least.) This would have
been the logic place to fix this.

Running this (in a sid/i386 chroot) on a Hello World programme I get
the same result. Adding -v shows the possible culprit to be:
    -plugin-opt=-pass-through=-lgcc_s
Actually, -Wl,-v is more legible and shows:
/usr/bin/ld -plugin /usr/lib/gcc/i486-linux-gnu/4.6/liblto_plugin.so -plugin-opt=/usr/lib/gcc/i486-linux-gnu/4.6/lto-wrapper -plugin-opt=-fresolution=/tmp/ccflfrHu.res -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --build-id --no-add-needed --eh-frame-hdr -m elf_i386 --hash-style=both -dynamic-linker /lib/ld-linux.so.2 -pie -o t /usr/lib/gcc/i486-linux-gnu/4.6/../../../i386-linux-gnu/Scrt1.o /usr/lib/gcc/i486-linux-gnu/4.6/../../../i386-linux-gnu/crti.o /usr/lib/gcc/i486-linux-gnu/4.6/crtbeginS.o -L/usr/lib/gcc/i486-linux-gnu/4.6 -L/usr/lib/gcc/i486-linux-gnu/4.6/../../../i386-linux-gnu -L/usr/lib/gcc/i486-linux-gnu/4.6/../../../../lib -L/lib/i386-linux-gnu -L/lib/../lib -L/usr/lib/i386-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/i486-linux-gnu/4.6/../../.. -z relro -z now t.o -v -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/i486-linux-gnu/4.6/crtendS.o /usr/lib/gcc/i486-linux-gnu/4.6/../../../i386-linux-gnu/crtn.o

bye,
//mirabilos
-- 
  “Having a smoking section in a restaurant is like having
          a peeing section in a swimming pool.”
						-- Edward Burr

--- End Message ---
--- Begin Message --- 
Source: binutils
Source-Version: 2.23.1-1~exp4

We believe that the bug you reported is fixed in the latest version of
binutils, 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 650145@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Matthias Klose <doko@debian.org> (supplier of updated binutils 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 ftpmaster@debian.org)


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Hash: SHA1

Format: 1.8
Date: Sat, 05 Jan 2013 14:06:23 +0100
Source: binutils
Binary: binutils binutils-dev binutils-multiarch binutils-gold binutils-hppa64 binutils-spu binutils-doc binutils-source
Architecture: source all amd64
Version: 2.23.1-1~exp4
Distribution: experimental
Urgency: low
Maintainer: Matthias Klose <doko@debian.org>
Changed-By: Matthias Klose <doko@debian.org>
Description: 
 binutils   - GNU assembler, linker and binary utilities
 binutils-dev - GNU binary utilities (BFD development files)
 binutils-doc - Documentation for the GNU assembler, linker and binary utilities
 binutils-gold - GNU gold linker utility
 binutils-hppa64 - GNU assembler, linker and binary utilities targeted for hppa64-li
 binutils-multiarch - Binary utilities that support multi-arch targets
 binutils-source - GNU assembler, linker and binary utilities (source)
 binutils-spu - GNU assembler, linker and binary utilities targeted for spu-elf
Closes: 650145 697353
Changes: 
 binutils (2.23.1-1~exp4) experimental; urgency=low
 .
   * Fix PR ld/14918: linking with -flto always links in libgcc_s.so.
     Closes: #650145.
   * Fix build failure with texinfo 4.14. Closes: #697353.
Checksums-Sha1: 
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 a80baacefa93eecec79008a40344a842f8fe7886 477558 binutils-doc_2.23.1-1~exp4_all.deb
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Checksums-Sha256: 
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Files: 
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 8f4de4112a5bbc63cba9c15e85ed6eae 4787328 devel extra binutils-dev_2.23.1-1~exp4_amd64.deb
 055c8eaf26673dba3384dea2cc21943b 2390390 devel extra binutils-multiarch_2.23.1-1~exp4_amd64.deb
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