GNU C Library master sources branch master updated. glibc-2.17-796-g6a97b62

[azanella at sourceware dot org]

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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=6a97b62a5b4f18aea849d6f4d8de58d1469d2521

commit 6a97b62a5b4f18aea849d6f4d8de58d1469d2521
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date:   Wed Jun 12 10:21:22 2013 -0500

    Fix unsafe compiler optimization
    
    GCC 4.8 enables -ftree-loop-distribute-patterns at -O3 by default and
    this optimization may transform loops into memset/memmove calls. Without
    proper handling this may generate unexpected PLT calls on GLIBC.
    This patch fixes by create memset/memmove alias to internal GLIBC
    __GI_memset/__GI_memmove symbols.

diff --git a/ChangeLog b/ChangeLog
index d38c96a..d08f0a6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2013-06-11  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
+
+	[BZ #15605]
+	* sysdeps/generic/symbol-hacks.h: Add workaround for memset/memmove calls
+	generated by the compiler on loop optimizations.
+	* sysdeps/wordsize-32/symbol-hacks.h: Include next symbol-hacks.h for
+	general definitions.
+
 2013-06-12  Joseph Myers  <joseph@codesourcery.com>
 
 	* math/bug-nextafter.c: Include <math-tests.h>.
diff --git a/sysdeps/generic/symbol-hacks.h b/sysdeps/generic/symbol-hacks.h
index bc7b4c4..9eaf014 100644
--- a/sysdeps/generic/symbol-hacks.h
+++ b/sysdeps/generic/symbol-hacks.h
@@ -1 +1,6 @@
-/* Fortunately nothing to do.  */
+/* Some compiler optimizations may transform loops into memset/memmove
+   calls and without proper declaration it may generate PLT calls.  */
+#if !defined __ASSEMBLER__ && !defined NOT_IN_libc && defined SHARED
+asm ("memmove = __GI_memmove");
+asm ("memset = __GI_memset");
+#endif
diff --git a/sysdeps/wordsize-32/symbol-hacks.h b/sysdeps/wordsize-32/symbol-hacks.h
index 52ac5c1..202a807 100644
--- a/sysdeps/wordsize-32/symbol-hacks.h
+++ b/sysdeps/wordsize-32/symbol-hacks.h
@@ -16,6 +16,8 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include_next "symbol-hacks.h"
+
 /* A very dirty trick: gcc emits references to __divdi3, __udivdi3,
    __moddi3, and __umoddi3.  These functions are exported and
    therefore we get PLTs.  Unnecessarily so.  Changing gcc is a big

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                          |    8 ++++++++
 sysdeps/generic/symbol-hacks.h     |    7 ++++++-
 sysdeps/wordsize-32/symbol-hacks.h |    2 ++
 3 files changed, 16 insertions(+), 1 deletions(-)


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