GNU C Library master sources branch master updated. glibc-2.20-394-g0d4ba8b

[davem at sourceware dot org]

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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=0d4ba8be9cd4cebcc2418c72c22a12fc9baf2c85

commit 0d4ba8be9cd4cebcc2418c72c22a12fc9baf2c85
Author: David S. Miller <davem@davemloft.net>
Date:   Fri Dec 19 13:34:30 2014 -0800

    Fix soft-fp build warning on sparc about strict aliasing.
    
    	* sysdeps/sparc/sparc32/soft-fp/q_neg.c (_Q_neg): Use a union to
    	access the quad as both a long double and as a series of 4 words.

diff --git a/ChangeLog b/ChangeLog
index a5f2888..3cef094 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2014-12-19  David S. Miller  <davem@davemloft.net>
 
+	* sysdeps/sparc/sparc32/soft-fp/q_neg.c (_Q_neg): Use a union to
+	access the quad as both a long double and as a series of 4 words.
+
 	* get-dynamic-info.h (elf_get_dynamic_info): Ignore -Warray-bounds for a
 	link_map->l_info array access.
 
diff --git a/sysdeps/sparc/sparc32/soft-fp/q_neg.c b/sysdeps/sparc/sparc32/soft-fp/q_neg.c
index b5049cd..5fb7e1a 100644
--- a/sysdeps/sparc/sparc32/soft-fp/q_neg.c
+++ b/sysdeps/sparc/sparc32/soft-fp/q_neg.c
@@ -24,20 +24,25 @@
 
 long double _Q_neg(const long double a)
 {
-  long double c = a;
+  union {
+    long double	ldbl;
+    UWtype	words[4];
+  } c;
+
+  c.ldbl = a;
 
 #if (__BYTE_ORDER == __BIG_ENDIAN)
-  ((UWtype *)&c)[0] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
+  c.words[0] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
 #elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 64)
-  ((UWtype *)&c)[1] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
+  c.words[1] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
 #elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 32)
-  ((UWtype *)&c)[3] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
+  c.words[3] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
 #else
   FP_DECL_Q(A); FP_DECL_Q(C);
 
   FP_UNPACK_RAW_Q(A, a);
   FP_NEG_Q(C, A);
-  FP_PACK_RAW_Q(c, C);
+  FP_PACK_RAW_Q(c.ldbl, C);
 #endif
-  return c;
+  return c.ldbl;
 }

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=6d4188dd7fe4fd7b9aeac91eab4e3c259538106d

commit 6d4188dd7fe4fd7b9aeac91eab4e3c259538106d
Author: David S. Miller <davem@davemloft.net>
Date:   Fri Dec 19 13:23:40 2014 -0800

    Fix array bounds warnings in elf_get_dyanmic_info() on sparc with gcc-4.6
    
    	* get-dynamic-info.h (elf_get_dynamic_info): Ignore -Warray-bounds for a
    	link_map->l_info array access.

diff --git a/ChangeLog b/ChangeLog
index 6bd8a38..a5f2888 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-12-19  David S. Miller  <davem@davemloft.net>
+
+	* get-dynamic-info.h (elf_get_dynamic_info): Ignore -Warray-bounds for a
+	link_map->l_info array access.
+
 2014-12-19  Chris Metcalf  <cmetcalf@ezchip.com>
 
 	* iconvdata/tst-loading.c (TIMEOUT): Increase timeout 10 sec.
diff --git a/elf/get-dynamic-info.h b/elf/get-dynamic-info.h
index 20ccf30..3f12e2e 100644
--- a/elf/get-dynamic-info.h
+++ b/elf/get-dynamic-info.h
@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <assert.h>
+#include <libc-internal.h>
 
 #ifndef RESOLVE_MAP
 static
@@ -47,7 +48,15 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
 	info[dyn->d_tag] = dyn;
       else if (dyn->d_tag >= DT_LOPROC &&
 	       dyn->d_tag < DT_LOPROC + DT_THISPROCNUM)
-	info[dyn->d_tag - DT_LOPROC + DT_NUM] = dyn;
+	{
+	  /* This does not violate the array bounds of l->l_info, but
+	     gcc 4.6 on sparc somehow does not see this.  */
+	  DIAG_PUSH_NEEDS_COMMENT;
+	  DIAG_IGNORE_NEEDS_COMMENT (4.6,
+				     "-Warray-bounds");
+	  info[dyn->d_tag - DT_LOPROC + DT_NUM] = dyn;
+	  DIAG_POP_NEEDS_COMMENT;
+	}
       else if ((d_tag_utype) DT_VERSIONTAGIDX (dyn->d_tag) < DT_VERSIONTAGNUM)
 	info[VERSYMIDX (dyn->d_tag)] = dyn;
       else if ((d_tag_utype) DT_EXTRATAGIDX (dyn->d_tag) < DT_EXTRANUM)

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

Summary of changes:
 ChangeLog                             |    8 ++++++++
 elf/get-dynamic-info.h                |   11 ++++++++++-
 sysdeps/sparc/sparc32/soft-fp/q_neg.c |   17 +++++++++++------
 3 files changed, 29 insertions(+), 7 deletions(-)


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