2010-04-08 Tobias Burnus <burnus@net-b.de>

[pf3gnuchains/gcc-fork.git] / gcc / mkmap-symver.awk

diff --git a/gcc/mkmap-symver.awk b/gcc/mkmap-symver.awk
index c6e3533..4877e90 100644 (file)
--- a/gcc/mkmap-symver.awk
+++ b/gcc/mkmap-symver.awk
@@ -1,11 +1,12 @@
 # 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 2, or (at your option) any later
+# 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
@@ -14,12 +15,16 @@
 # License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with GCC; see the file COPYING.  If not, write to the Free
-# Software Foundation, 59 Temple Place - Suite 330, Boston MA
-# 02111-1307, USA.
+# 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.
@@ -41,7 +46,9 @@ state == "nm" && ($1 == "U" || $2 == "U") {
 }
 
 state == "nm" && NF == 3 {
-  def[$3] = 1;
+  split ($3, s, "@")
+  def[s[1]] = 1;
+  sawsymbol = 1;
   next;
 }
 
@@ -52,8 +59,10 @@ state == "nm" {
 # 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 inheritence.  A symbol may appear in more than
+# 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;
@@ -61,7 +70,8 @@ NF == 3 && $1 == "%inherit" {
 }
 
 NF == 2 && $2 == "{" {
-  libs[$1] = 1;
+  if ($1 != "%exclude")
+    libs[$1] = 1;
   thislib = $1;
   next;
 }
@@ -72,11 +82,23 @@ $1 == "}" {
 }
 
 {
-  ver[$1] = thislib;
+  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);
 }
@@ -88,13 +110,26 @@ function output(lib) {
   if (inherit[lib])
     output(inherit[lib]);
 
-  printf("%s {\n", lib);
-  printf("  global:\n");
-  for (sym in ver)
-    if ((ver[sym] == lib) && (sym in def))
-      printf("\t%s;\n", sym);
-
-  if (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");