projects / bison.git / blame
| Commit | Line | Data |
|---|---|---|
| ae5895dd | 1 | # onceonly.m4 serial 2 |
| f61aad93 PE |
2 | dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
| 3 | dnl This file is free software, distributed under the terms of the GNU | |
| 4 | dnl General Public License. As a special exception to the GNU General | |
| 5 | dnl Public License, this file may be distributed as part of a program | |
| 6 | dnl that contains a configuration script generated by Autoconf, under | |
| 7 | dnl the same distribution terms as the rest of that program. | |
| 8 | ||
| 9 | dnl This file defines some "once only" variants of standard autoconf macros. | |
| 10 | dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS | |
| 11 | dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS | |
| 12 | dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS | |
| 13 | dnl AC_REQUIRE([AC_HEADER_STDC]) like AC_HEADER_STDC | |
| 14 | dnl The advantage is that the check for each of the headers/functions/decls | |
| 15 | dnl will be put only once into the 'configure' file. It keeps the size of | |
| 16 | dnl the 'configure' file down, and avoids redundant output when 'configure' | |
| 17 | dnl is run. | |
| 18 | dnl The drawback is that the checks cannot be conditionalized. If you write | |
| 19 | dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi | |
| 20 | dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to | |
| 21 | dnl empty, and the check will be inserted before the body of the AC_DEFUNed | |
| 22 | dnl function. | |
| 23 | ||
| 24 | dnl Taken from Autoconf 2.50; can be removed once we assume 2.50 or later. | |
| 25 | define([m4_quote], [[$*]]) | |
| 26 | ||
| 27 | # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of | |
| 28 | # AC_CHECK_HEADERS(HEADER1 HEADER2 ...). | |
| 29 | AC_DEFUN([AC_CHECK_HEADERS_ONCE], [ | |
| 30 | : | |
| 31 | AC_FOREACH([gl_HEADER_NAME], [$1], [ | |
| 32 | AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(defn([gl_HEADER_NAME]), | |
| 33 | [-./], [___])), [ | |
| 34 | AC_CHECK_HEADERS(gl_HEADER_NAME) | |
| 35 | ]) | |
| 36 | AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, | |
| 37 | [-./], [___]))) | |
| 38 | ]) | |
| 39 | ]) | |
| 40 | ||
| 41 | # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of | |
| 42 | # AC_CHECK_FUNCS(FUNC1 FUNC2 ...). | |
| 43 | AC_DEFUN([AC_CHECK_FUNCS_ONCE], [ | |
| 44 | : | |
| 45 | AC_FOREACH([gl_FUNC_NAME], [$1], [ | |
| 46 | AC_DEFUN([gl_CHECK_FUNC_]defn([gl_FUNC_NAME]), [ | |
| 47 | AC_CHECK_FUNCS(defn([gl_FUNC_NAME])) | |
| 48 | ]) | |
| 49 | AC_REQUIRE([gl_CHECK_FUNC_]defn([gl_FUNC_NAME])) | |
| 50 | ]) | |
| 51 | ]) | |
| 52 | ||
| 53 | # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of | |
| 54 | # AC_CHECK_DECLS(DECL1, DECL2, ...). | |
| 55 | AC_DEFUN([AC_CHECK_DECLS_ONCE], [ | |
| 56 | : | |
| 57 | AC_FOREACH([gl_DECL_NAME], [$1], [ | |
| 58 | AC_DEFUN([gl_CHECK_DECL_]defn([gl_DECL_NAME]), [ | |
| 59 | AC_CHECK_DECLS(defn([gl_DECL_NAME])) | |
| 60 | ]) | |
| 61 | AC_REQUIRE([gl_CHECK_DECL_]defn([gl_DECL_NAME])) | |
| 62 | ]) | |
| 63 | ]) |