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. 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.
MFC after:	3 weeks

1 files changed, 18 insertions, 9 deletions

diff --git a/contrib/gcclibs/libcpp/init.c b/contrib/gcclibs/libcpp/init.c
index 8280f2f..248d84f 100644
--- a/contrib/gcclibs/libcpp/init.c
+++ b/contrib/gcclibs/libcpp/init.c
@@ -348,11 +348,8 @@ mark_named_operators (cpp_reader *pfile)
     }
 }
 
-/* Read the builtins table above and enter them, and language-specific
-   macros, into the hash table.  HOSTED is true if this is a hosted
-   environment.  */
 void
-cpp_init_builtins (cpp_reader *pfile, int hosted)
+cpp_init_special_builtins (cpp_reader *pfile)
 {
   const struct builtin *b;
   size_t n = ARRAY_SIZE (builtin_array);
@@ -361,10 +358,7 @@ cpp_init_builtins (cpp_reader *pfile, int hosted)
     n -= 2;
   else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
 	   || CPP_OPTION (pfile, std))
-    {
-      n--;
-      _cpp_define_builtin (pfile, "__STDC__ 1");
-    }
+    n--;
 
   for (b = builtin_array; b < builtin_array + n; b++)
     {
@@ -373,6 +367,20 @@ cpp_init_builtins (cpp_reader *pfile, int hosted)
       hp->flags |= NODE_BUILTIN | NODE_WARN;
       hp->value.builtin = (enum builtin_type) b->value;
     }
+}
+
+/* Read the builtins table above and enter them, and language-specific
+   macros, into the hash table.  HOSTED is true if this is a hosted
+   environment.  */
+void
+cpp_init_builtins (cpp_reader *pfile, int hosted)
+{
+  cpp_init_special_builtins (pfile);
+
+  if (!CPP_OPTION (pfile, traditional)
+      && (! CPP_OPTION (pfile, stdc_0_in_system_headers)
+	  || CPP_OPTION (pfile, std)))
+    _cpp_define_builtin (pfile, "__STDC__ 1");
 
   if (CPP_OPTION (pfile, cplusplus))
     _cpp_define_builtin (pfile, "__cplusplus 1");
@@ -620,7 +628,8 @@ post_options (cpp_reader *pfile)
      preprocessed text.  Read preprocesed source in ISO mode.  */
   if (CPP_OPTION (pfile, preprocessed))
     {
-      pfile->state.prevent_expansion = 1;
+      if (!CPP_OPTION (pfile, directives_only))
+	pfile->state.prevent_expansion = 1;
       CPP_OPTION (pfile, traditional) = 0;
     }