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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [mkmap-symver.awk] - Blame information for rev 280

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Line No. Rev Author Line
1 280 jeremybenn
# Generate an ELF symbol version map a-la Solaris and GNU ld.
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#       Copyright (C) 2007, 2008  Free Software Foundation, Inc.
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#       Contributed by Richard Henderson <rth@cygnus.com>
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#
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# This file is part of GCC.
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#
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# GCC is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 3, or (at your option) any later
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# version.
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#
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# GCC is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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# License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GCC; see the file COPYING3.  If not see
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# <http://www.gnu.org/licenses/>.
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BEGIN {
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  state = "nm";
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  sawsymbol = 0;
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  if (leading_underscore)
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    prefix = "_";
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  else
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    prefix = "";
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}
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# Remove comment and blank lines.
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/^ *#/ || /^ *$/ {
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  next;
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}
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# We begin with nm input.  Collect the set of symbols that are present
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# so that we can not emit them into the final version script -- Solaris
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# complains at us if we do.
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state == "nm" && /^%%/ {
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  state = "ver";
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  next;
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}
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state == "nm" && ($1 == "U" || $2 == "U") {
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  next;
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}
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state == "nm" && NF == 3 {
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  split ($3, s, "@")
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  def[s[1]] = 1;
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  sawsymbol = 1;
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  next;
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}
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state == "nm" {
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  next;
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}
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# Now we process a simplified variant of the Solaris symbol version
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# script.  We have one symbol per line, no semicolons, simple markers
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# for beginning and ending each section, and %inherit markers for
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# describing version inheritance.  A symbol may appear in more than
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# one symbol version, and the last seen takes effect.
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# The magic version name '%exclude' causes all the symbols given that
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# version to be dropped from the output (unless a later version overrides).
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NF == 3 && $1 == "%inherit" {
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  inherit[$2] = $3;
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  next;
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}
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NF == 2 && $2 == "{" {
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  if ($1 != "%exclude")
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    libs[$1] = 1;
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  thislib = $1;
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  next;
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}
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$1 == "}" {
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  thislib = "";
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  next;
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}
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{
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  sym = prefix $1;
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  symbols[sym] = 1
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  if (thislib != "%exclude")
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    ver[sym, thislib] = 1;
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  else {
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    for (l in libs)
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      ver[sym, l] = 0;
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  }
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  next;
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}
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END {
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  if (!sawsymbol)
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    {
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      print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
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      exit 1;
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    }
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  for (l in libs)
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    output(l);
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}
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function output(lib) {
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  if (done[lib])
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    return;
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  done[lib] = 1;
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  if (inherit[lib])
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    output(inherit[lib]);
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  empty=1
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  for (sym in symbols)
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    if ((ver[sym, lib] != 0) && (sym in def))
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      {
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        if (empty)
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          {
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            printf("%s {\n", lib);
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            printf("  global:\n");
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            empty = 0;
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          }
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        printf("\t%s;\n", sym);
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      }
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  if (empty)
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    {
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      for (l in libs)
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        if (inherit[l] == lib)
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          inherit[l] = inherit[lib];
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    }
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  else if (inherit[lib])
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    printf("} %s;\n", inherit[lib]);
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  else
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    printf ("\n  local:\n\t*;\n};\n");
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}

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