| 1 | # onceonly.m4 serial 3
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| 2 | dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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| 3 | dnl This file is free software, distributed under the terms of the GNU
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| 4 | dnl General Public License. As a special exception to the GNU General
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| 5 | dnl Public License, this file may be distributed as part of a program
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| 6 | dnl that contains a configuration script generated by Autoconf, under
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| 7 | dnl the same distribution terms as the rest of that program.
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| 8 |
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| 9 | dnl This file defines some "once only" variants of standard autoconf macros.
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| 10 | dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS
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| 11 | dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS
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| 12 | dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS
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| 13 | dnl AC_REQUIRE([AC_HEADER_STDC]) like AC_HEADER_STDC
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| 14 | dnl The advantage is that the check for each of the headers/functions/decls
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| 15 | dnl will be put only once into the 'configure' file. It keeps the size of
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| 16 | dnl the 'configure' file down, and avoids redundant output when 'configure'
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| 17 | dnl is run.
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| 18 | dnl The drawback is that the checks cannot be conditionalized. If you write
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| 19 | dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi
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| 20 | dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to
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| 21 | dnl empty, and the check will be inserted before the body of the AC_DEFUNed
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| 22 | dnl function.
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| 23 |
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| 24 | dnl Autoconf version 2.57 or newer is recommended.
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| 25 | AC_PREREQ(2.54)
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| 26 |
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| 27 | # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of
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| 28 | # AC_CHECK_HEADERS(HEADER1 HEADER2 ...).
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| 29 | AC_DEFUN([AC_CHECK_HEADERS_ONCE], [
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| 30 | :
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| 31 | AC_FOREACH([gl_HEADER_NAME], [$1], [
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| 32 | AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(m4_defn([gl_HEADER_NAME]),
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| 33 | [-./], [___])), [
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| 34 | AC_CHECK_HEADERS(gl_HEADER_NAME)
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| 35 | ])
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| 36 | AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME,
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| 37 | [-./], [___])))
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| 38 | ])
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| 39 | ])
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| 40 |
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| 41 | # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of
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| 42 | # AC_CHECK_FUNCS(FUNC1 FUNC2 ...).
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| 43 | AC_DEFUN([AC_CHECK_FUNCS_ONCE], [
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| 44 | :
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| 45 | AC_FOREACH([gl_FUNC_NAME], [$1], [
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| 46 | AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [
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| 47 | AC_CHECK_FUNCS(m4_defn([gl_FUNC_NAME]))
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| 48 | ])
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| 49 | AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]))
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| 50 | ])
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| 51 | ])
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| 52 |
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| 53 | # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of
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| 54 | # AC_CHECK_DECLS(DECL1, DECL2, ...).
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| 55 | AC_DEFUN([AC_CHECK_DECLS_ONCE], [
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| 56 | :
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| 57 | AC_FOREACH([gl_DECL_NAME], [$1], [
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| 58 | AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [
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| 59 | AC_CHECK_DECLS(m4_defn([gl_DECL_NAME]))
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| 60 | ])
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| 61 | AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]))
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| 62 | ])
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| 63 | ])
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