MFC rr258501, r258507;

gcc: Bring updates from Google's enhanced gcc-4.2.1.

Google released and enhanced version of gcc-4.2.1 plus their local
patches for Android[1].

The patches are owned by Google and the license hasn't been changed
from  the original GPLv2. We are only bringing a subset of the
available patches that may be helpful in FreeBSD, in other words,
changes specific to android are not included.

From the README.google file[1].

Patches applied to google_vendor_src_branch/gcc/gcc-4.2.1:

gcc/Makefile.in
gcc/c-common.c
gcc/c-common.h
gcc/c-opts.c
gcc/c-typeck.c
gcc/cp/typeck.c
gcc/doc/invoke.texi
gcc/flags.h
gcc/opts.c
gcc/tree-flow.h
gcc/tree-ssa-alias-warnings.c
gcc/tree-ssa-alias.c

 Backport of -Wstrict-aliasing from mainline.
  Silvius Rus <rus@google.com>

gcc/coverage.c:
  Patch coverage_checksum_string for PR 25351.
  Seongbae Park <spark@google.com>
  Not yet submitted to FSF.

gcc/c-opts.c
gcc/c-ppoutput.c
gcc/c.opt
gcc/doc/cppopts.texi
libcpp/Makefile.in
libcpp/directives-only.c
libcpp/directives.c
libcpp/files.c
libcpp/include/cpplib.h
libcpp/init.c
libcpp/internal.h
libcpp/macro.c
  Support for -fdirectives-only.
  Ollie Wild <aaw@google.com>.
  Submitted to FSF but not yet approved.

libstdc++-v3/include/ext/hashtable.h
  http://b/742065
  http://b/629994
  Reduce min size of hashtable for hash_map, hash_set from 53 to 5

libstdc++-v3/include/ext/hashtable.h
  http://b/629994
  Do not iterate over buckets if hashtable is empty.

gcc/common.opt
gcc/doc/invoke.texi
gcc/flags.h
gcc/gimplify.c
gcc/opts.c
  Add Saito's patch for -finstrument-functions-exclude-* options.

gcc/common.opt
gcc/doc/invoke.texi
gcc/final.c
gcc/flags.h
gcc/opts.c
gcc/testsuite/gcc.dg/Wframe-larger-than.c
  Add a new flag -Wframe-larger-than- which enables a new warning
  when a frame size of a function is larger than specified.
  This patch hasn't been integrated into gcc mainline yet.

gcc/tree-vrp.c
  Add a hack to avoid using ivopts information for pointers starting
  at constant values.

Reference:

[1]
https://android.googlesource.com/toolchain/gcc/+/master/gcc-4.2.1/

Obtained from:	Google Inc.

1 files changed, 15 insertions, 1 deletions

diff --git a/contrib/gcc/cp/typeck.c b/contrib/gcc/cp/typeck.c
index dd92b22..d17d0bb 100644
--- a/contrib/gcc/cp/typeck.c
+++ b/contrib/gcc/cp/typeck.c
@@ -2334,6 +2334,19 @@ build_indirect_ref (tree ptr, const char *errorstring)
 	 types.  */
       tree t = canonical_type_variant (TREE_TYPE (type));
 
+      if (TREE_CODE (ptr) == CONVERT_EXPR
+          || TREE_CODE (ptr) == NOP_EXPR
+          || TREE_CODE (ptr) == VIEW_CONVERT_EXPR)
+	{
+	  /* If a warning is issued, mark it to avoid duplicates from
+	     the backend.  This only needs to be done at
+	     warn_strict_aliasing > 2.  */
+	  if (warn_strict_aliasing > 2)
+	    if (strict_aliasing_warning (TREE_TYPE (TREE_OPERAND (ptr, 0)),
+					 type, TREE_OPERAND (ptr, 0)))
+	      TREE_NO_WARNING (ptr) = 1;
+	}
+
       if (VOID_TYPE_P (t))
 	{
 	  /* A pointer to incomplete type (other than cv void) can be
@@ -5256,7 +5269,8 @@ build_reinterpret_cast_1 (tree type, tree expr, bool c_cast_p,
       /* We need to strip nops here, because the frontend likes to
 	 create (int *)&a for array-to-pointer decay, instead of &a[0].  */
       STRIP_NOPS (sexpr);
-      strict_aliasing_warning (intype, type, sexpr);
+      if (warn_strict_aliasing <= 2)
+	strict_aliasing_warning (intype, type, sexpr);
 
       return fold_if_not_in_template (build_nop (type, expr));
     }