--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/mkmap-symver.awk	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,136 @@
+# Generate an ELF symbol version map a-la Solaris and GNU ld.
+#	Copyright (C) 2007, 2008  Free Software Foundation, Inc.
+#	Contributed by Richard Henderson <rth@cygnus.com>
+#
+# This file is part of GCC.
+#
+# GCC is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 3, or (at your option) any later
+# version.
+#
+# GCC is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3.  If not see
+# <http://www.gnu.org/licenses/>.
+
+BEGIN {
+  state = "nm";
+  sawsymbol = 0;
+  if (leading_underscore)
+    prefix = "_";
+  else
+    prefix = "";
+}
+
+# Remove comment and blank lines.
+/^ *#/ || /^ *$/ {
+  next;
+}
+
+# We begin with nm input.  Collect the set of symbols that are present
+# so that we can not emit them into the final version script -- Solaris
+# complains at us if we do.
+
+state == "nm" && /^%%/ {
+  state = "ver";
+  next;
+}
+
+state == "nm" && ($1 == "U" || $2 == "U") {
+  next;
+}
+
+state == "nm" && NF == 3 {
+  split ($3, s, "@")
+  def[s[1]] = 1;
+  sawsymbol = 1;
+  next;
+}
+
+state == "nm" {
+  next;
+}
+
+# Now we process a simplified variant of the Solaris symbol version
+# script.  We have one symbol per line, no semicolons, simple markers
+# for beginning and ending each section, and %inherit markers for
+# describing version inheritance.  A symbol may appear in more than
+# one symbol version, and the last seen takes effect.
+# The magic version name '%exclude' causes all the symbols given that
+# version to be dropped from the output (unless a later version overrides).
+
+NF == 3 && $1 == "%inherit" {
+  inherit[$2] = $3;
+  next;
+}
+
+NF == 2 && $2 == "{" {
+  if ($1 != "%exclude")
+    libs[$1] = 1;
+  thislib = $1;
+  next;
+}
+
+$1 == "}" {
+  thislib = "";
+  next;
+}
+
+{
+  sym = prefix $1;
+  symbols[sym] = 1
+  if (thislib != "%exclude")
+    ver[sym, thislib] = 1;
+  else {
+    for (l in libs)
+      ver[sym, l] = 0;
+  }
+  next;
+}
+
+END {
+  if (!sawsymbol)
+    {
+      print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
+      exit 1;
+    }
+  for (l in libs)
+    output(l);
+}
+
+function output(lib) {
+  if (done[lib])
+    return;
+  done[lib] = 1;
+  if (inherit[lib])
+    output(inherit[lib]);
+
+  empty=1
+  for (sym in symbols)
+    if ((ver[sym, lib] != 0) && (sym in def))
+      {
+	if (empty)
+	  {
+	    printf("%s {\n", lib);
+	    printf("  global:\n");
+	    empty = 0;
+	  }
+	printf("\t%s;\n", sym);
+      }
+
+  if (empty)
+    {
+      for (l in libs)
+	if (inherit[l] == lib)
+	  inherit[l] = inherit[lib];
+    }
+  else if (inherit[lib])
+    printf("} %s;\n", inherit[lib]);
+  else
+    printf ("\n  local:\n\t*;\n};\n");
+}