1 -*- Autoconf -*- 2 3 # Common code for C-like languages (C, C++, Java, etc.) 4 5 # Copyright (C) 2012 Free Software Foundation, Inc. 6 7 # This program is free software: you can redistribute it and/or modify 8 # it under the terms of the GNU General Public License as published by 9 # the Free Software Foundation, either version 3 of the License, or 10 # (at your option) any later version. 11 # 12 # This program is distributed in the hope that it will be useful, 13 # but WITHOUT ANY WARRANTY; without even the implied warranty of 14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 # GNU General Public License for more details. 16 # 17 # You should have received a copy of the GNU General Public License 18 # along with this program. If not, see <http://www.gnu.org/licenses/>. 19 20 # b4_dollar_dollar_(VALUE, FIELD, DEFAULT-FIELD) 21 # ---------------------------------------------- 22 # If FIELD (or DEFAULT-FIELD) is non-null, return "VALUE.FIELD", 23 # otherwise just VALUE. Be sure to pass "(VALUE)" is VALUE is a 24 # pointer. 25 m4_define([b4_dollar_dollar_], 26 [m4_if([$2], [[]], 27 [m4_ifval([$3], [($1.$3)], 28 [$1])], 29 [($1.$2)])]) 30 31 # b4_dollar_pushdef(VALUE-POINTER, DEFAULT-FIELD, LOCATION) 32 # b4_dollar_popdef 33 # --------------------------------------------------------- 34 # Define b4_dollar_dollar for VALUE and DEFAULT-FIELD, 35 # and b4_at_dollar for LOCATION. 36 m4_define([b4_dollar_pushdef], 37 [m4_pushdef([b4_dollar_dollar], 38 [b4_dollar_dollar_([$1], m4_dquote($][1), [$2])])dnl 39 m4_pushdef([b4_at_dollar], [$3])dnl 40 ]) 41 m4_define([b4_dollar_popdef], 42 [m4_popdef([b4_at_dollar])dnl 43 m4_popdef([b4_dollar_dollar])dnl 44 ]) 45
