Daily bump.
[official-gcc.git] / libgcc / mkmap-symver.awk
blobafa94ac5e9dd7b433cc02b9652b9db7aaf1ec881
1 # Generate an ELF symbol version map a-la Solaris and GNU ld.
2 # Copyright (C) 2007-2024 Free Software Foundation, Inc.
3 # Contributed by Richard Henderson <rth@cygnus.com>
5 # This file is part of GCC.
7 # GCC is free software; you can redistribute it and/or modify it under
8 # the terms of the GNU General Public License as published by the Free
9 # Software Foundation; either version 3, or (at your option) any later
10 # version.
12 # GCC is distributed in the hope that it will be useful, but WITHOUT
13 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 # License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GCC; see the file COPYING3. If not see
19 # <http://www.gnu.org/licenses/>.
21 BEGIN {
22 state = "nm";
23 sawsymbol = 0;
24 if (leading_underscore)
25 prefix = "_";
26 else
27 prefix = "";
30 # Remove comment and blank lines.
31 /^ *#/ || /^ *$/ {
32 next;
35 # We begin with nm input. Collect the set of symbols that are present
36 # so that we cannot emit them into the final version script -- Solaris
37 # complains at us if we do.
39 state == "nm" && /^%%/ {
40 state = "ver";
41 next;
44 state == "nm" && ($1 == "U" || $2 == "U") {
45 next;
48 state == "nm" && NF == 3 {
49 split ($3, s, "@")
50 if (skip_underscore && substr(s[1], 1, 1) == "_")
51 symname = substr(s[1], 2);
52 else
53 symname = s[1];
54 def[symname] = 1;
55 sawsymbol = 1;
56 next;
59 state == "nm" {
60 next;
63 # Now we process a simplified variant of the Solaris symbol version
64 # script. We have one symbol per line, no semicolons, simple markers
65 # for beginning and ending each section, and %inherit markers for
66 # describing version inheritance. A symbol may appear in more than
67 # one symbol version, and the last seen takes effect.
68 # The magic version name '%exclude' causes all the symbols given that
69 # version to be dropped from the output (unless a later version overrides).
71 NF == 3 && $1 == "%inherit" {
72 inherit[$2] = $3;
73 next;
76 NF == 2 && $2 == "{" {
77 if ($1 != "%exclude")
78 libs[$1] = 1;
79 thislib = $1;
80 next;
83 $1 == "}" {
84 thislib = "";
85 next;
89 sym = prefix $1;
90 symbols[sym] = 1
91 if (thislib != "%exclude")
92 ver[sym, thislib] = 1;
93 else {
94 for (l in libs)
95 ver[sym, l] = 0;
97 next;
100 END {
101 if (!sawsymbol)
103 print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
104 exit 1;
106 for (l in libs)
107 output(l);
110 function output(lib) {
111 if (done[lib])
112 return;
113 done[lib] = 1;
114 if (inherit[lib])
115 output(inherit[lib]);
117 empty=1
118 for (sym in symbols)
119 if ((ver[sym, lib] != 0) && (sym in def))
121 if (empty)
123 printf("%s {\n", lib);
124 printf(" global:\n");
125 empty = 0;
127 printf("\t%s;\n", sym);
130 if (empty)
132 for (l in libs)
133 if (inherit[l] == lib)
134 inherit[l] = inherit[lib];
136 else if (inherit[lib])
137 printf("} %s;\n", inherit[lib]);
138 else
139 printf ("\n local:\n\t*;\n};\n");