1# Generate an ELF symbol version map a-la Solaris and GNU ld. 2# Contributed by Richard Henderson <rth@cygnus.com> 3# 4# This file is part of GCC. 5# 6# GCC is free software; you can redistribute it and/or modify it under 7# the terms of the GNU General Public License as published by the Free 8# Software Foundation; either version 2, or (at your option) any later 9# version. 10# 11# GCC is distributed in the hope that it will be useful, but WITHOUT 12# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14# License for more details. 15# 16# You should have received a copy of the GNU General Public License 17# along with GCC; see the file COPYING. If not, write to the Free 18# Software Foundation, 51 Franklin Street, Fifth Floor, Boston MA 19# 02110-1301, USA. 20 21BEGIN { 22 state = "nm"; 23 sawsymbol = 0; 24 if (leading_underscore) 25 prefix = "_"; 26 else 27 prefix = ""; 28} 29 30# Remove comment and blank lines. 31/^ *#/ || /^ *$/ { 32 next; 33} 34 35# We begin with nm input. Collect the set of symbols that are present 36# so that we can not emit them into the final version script -- Solaris 37# complains at us if we do. 38 39state == "nm" && /^%%/ { 40 state = "ver"; 41 next; 42} 43 44state == "nm" && ($1 == "U" || $2 == "U") { 45 next; 46} 47 48state == "nm" && NF == 3 { 49 def[$3] = 1; 50 sawsymbol = 1; 51 next; 52} 53 54state == "nm" { 55 next; 56} 57 58# Now we process a simplified variant of the Solaris symbol version 59# script. We have one symbol per line, no semicolons, simple markers 60# for beginning and ending each section, and %inherit markers for 61# describing version inheritence. A symbol may appear in more than 62# one symbol version, and the last seen takes effect. 63# The magic version name '%exclude' causes all the symbols given that 64# version to be dropped from the output (unless a later version overrides). 65 66NF == 3 && $1 == "%inherit" { 67 inherit[$2] = $3; 68 next; 69} 70 71NF == 2 && $2 == "{" { 72 if ($1 != "%exclude") 73 libs[$1] = 1; 74 thislib = $1; 75 next; 76} 77 78$1 == "}" { 79 thislib = ""; 80 next; 81} 82 83{ 84 sym = prefix $1; 85 if (thislib != "%exclude") 86 ver[sym] = thislib; 87 else 88 delete ver[sym]; 89 next; 90} 91 92END { 93 if (!sawsymbol) 94 { 95 print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2"; 96 exit 1; 97 } 98 for (l in libs) 99 output(l); 100} 101 102function output(lib) { 103 if (done[lib]) 104 return; 105 done[lib] = 1; 106 if (inherit[lib]) 107 output(inherit[lib]); 108 109 empty=1 110 for (sym in ver) 111 if ((ver[sym] == lib) && (sym in def)) 112 { 113 if (empty) 114 { 115 printf("%s {\n", lib); 116 printf(" global:\n"); 117 empty = 0; 118 } 119 printf("\t%s;\n", sym); 120 } 121 122 if (empty) 123 { 124 for (l in libs) 125 if (inherit[l] == lib) 126 inherit[l] = inherit[lib]; 127 } 128 else if (inherit[lib]) 129 printf("} %s;\n", inherit[lib]); 130 else 131 printf ("\n local:\n\t*;\n};\n"); 132} 133