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, 25 insertions, 0 deletions

diff --git a/contrib/gcc/c-ppoutput.c b/contrib/gcc/c-ppoutput.c
index 10540b7f1251..62b350b9ef33 100644
--- a/contrib/gcc/c-ppoutput.c
+++ b/contrib/gcc/c-ppoutput.c
@@ -41,6 +41,8 @@ static struct
 
 /* General output routines.  */
 static void scan_translation_unit (cpp_reader *);
+static void print_lines_directives_only (int, const void *, size_t);
+static void scan_translation_unit_directives_only (cpp_reader *);
 static void scan_translation_unit_trad (cpp_reader *);
 static void account_for_newlines (const unsigned char *, size_t);
 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
@@ -75,6 +77,9 @@ preprocess_file (cpp_reader *pfile)
     }
   else if (cpp_get_options (pfile)->traditional)
     scan_translation_unit_trad (pfile);
+  else if (cpp_get_options (pfile)->directives_only
+	   && !cpp_get_options (pfile)->preprocessed)
+    scan_translation_unit_directives_only (pfile);
   else
     scan_translation_unit (pfile);
 
@@ -179,6 +184,26 @@ scan_translation_unit (cpp_reader *pfile)
     }
 }
 
+static void
+print_lines_directives_only (int lines, const void *buf, size_t size)
+{
+  print.src_line += lines;
+  fwrite (buf, 1, size, print.outf);
+}
+
+/* Writes out the preprocessed file, handling spacing and paste
+   avoidance issues.  */
+static void
+scan_translation_unit_directives_only (cpp_reader *pfile)
+{
+  struct _cpp_dir_only_callbacks cb;
+
+  cb.print_lines = print_lines_directives_only;
+  cb.maybe_print_line = maybe_print_line;
+
+  _cpp_preprocess_dir_only (pfile, &cb);
+}
+
 /* Adjust print.src_line for newlines embedded in output.  */
 static void
 account_for_newlines (const unsigned char *str, size_t len)