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[Bug libc/21666] .symver is used on common symbol
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 23 Jun 2017 18:41:41 +0000
- Subject: [Bug libc/21666] .symver is used on common symbol
- Auto-submitted: auto-generated
- References: <bug-21666-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=21666
--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".
The branch, hjl/pr21666/master has been created
at acecb3f7de4892b68ec1b464a576ee84b3f97527 (commit)
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=acecb3f7de4892b68ec1b464a576ee84b3f97527
commit acecb3f7de4892b68ec1b464a576ee84b3f97527
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Fri Jun 23 11:29:38 2017 -0700
x86-64: Optimize L(between_2_3) in memcmp-avx2-movbe.S
Turn
movzbl -1(%rdi, %rdx), %edi
movzbl -1(%rsi, %rdx), %esi
orl %edi, %eax
orl %esi, %ecx
into
movb -1(%rdi, %rdx), %al
movb -1(%rsi, %rdx), %cl
* sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S (between_2_3):
Replace movzbl and orl with movb.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=67145d84d9719d270f63f4399e337a4bdcb778f5
commit 67145d84d9719d270f63f4399e337a4bdcb778f5
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Fri Jun 23 09:03:19 2017 -0700
Avoid .symver on common symbols [BZ #21666]
The .symver directive on common symbol just creates a new common symbol,
not an alias and the newer assembler with the bug fix for
https://sourceware.org/bugzilla/show_bug.cgi?id=21661
will issue an error. Before the fix, we got
$ readelf -sW libc.so | grep "loc[12s]"
5109: 00000000003a0608 8 OBJECT LOCAL DEFAULT 36 loc1
5188: 00000000003a0610 8 OBJECT LOCAL DEFAULT 36 loc2
5455: 00000000003a0618 8 OBJECT LOCAL DEFAULT 36 locs
6575: 00000000003a05f0 8 OBJECT GLOBAL DEFAULT 36 locs@GLIBC_2.2.5
7156: 00000000003a05f8 8 OBJECT GLOBAL DEFAULT 36 loc1@GLIBC_2.2.5
7312: 00000000003a0600 8 OBJECT GLOBAL DEFAULT 36 loc2@GLIBC_2.2.5
in libc.so. The versioned loc1, loc2 and locs have the wrong addresses.
After the fix, we got
$ readelf -sW libc.so | grep "loc[12s]"
6570: 000000000039e3b8 8 OBJECT GLOBAL DEFAULT 34 locs@GLIBC_2.2.5
7151: 000000000039e3c8 8 OBJECT GLOBAL DEFAULT 34 loc1@GLIBC_2.2.5
7307: 000000000039e3c0 8 OBJECT GLOBAL DEFAULT 34 loc2@GLIBC_2.2.5
[BZ #21666]
* misc/regexp.c (loc1): Add __attribute__ ((nocommon));
(loc2): Likewise.
(locs): Likewise.
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