64 lines
2.5 KiB
Plaintext
64 lines
2.5 KiB
Plaintext
# onceonly.m4 serial 3 (gettext-0.12)
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dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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dnl This file is free software, distributed under the terms of the GNU
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dnl General Public License. As a special exception to the GNU General
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dnl Public License, this file may be distributed as part of a program
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dnl that contains a configuration script generated by Autoconf, under
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dnl the same distribution terms as the rest of that program.
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dnl This file defines some "once only" variants of standard autoconf macros.
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dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS
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dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS
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dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS
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dnl AC_REQUIRE([AC_HEADER_STDC]) like AC_HEADER_STDC
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dnl The advantage is that the check for each of the headers/functions/decls
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dnl will be put only once into the 'configure' file. It keeps the size of
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dnl the 'configure' file down, and avoids redundant output when 'configure'
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dnl is run.
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dnl The drawback is that the checks cannot be conditionalized. If you write
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dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi
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dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to
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dnl empty, and the check will be inserted before the body of the AC_DEFUNed
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dnl function.
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dnl Autoconf version 2.57 or newer is recommended.
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AC_PREREQ(2.54)
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# AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of
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# AC_CHECK_HEADERS(HEADER1 HEADER2 ...).
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AC_DEFUN([AC_CHECK_HEADERS_ONCE], [
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:
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AC_FOREACH([gl_HEADER_NAME], [$1], [
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AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(m4_defn([gl_HEADER_NAME]),
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[-./], [___])), [
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AC_CHECK_HEADERS(gl_HEADER_NAME)
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])
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AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME,
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[-./], [___])))
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])
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])
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# AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of
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# AC_CHECK_FUNCS(FUNC1 FUNC2 ...).
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AC_DEFUN([AC_CHECK_FUNCS_ONCE], [
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:
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AC_FOREACH([gl_FUNC_NAME], [$1], [
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AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [
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AC_CHECK_FUNCS(m4_defn([gl_FUNC_NAME]))
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])
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AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]))
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])
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])
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# AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of
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# AC_CHECK_DECLS(DECL1, DECL2, ...).
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AC_DEFUN([AC_CHECK_DECLS_ONCE], [
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:
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AC_FOREACH([gl_DECL_NAME], [$1], [
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AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [
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AC_CHECK_DECLS(m4_defn([gl_DECL_NAME]))
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])
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AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]))
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])
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])
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