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