From 39a50c763240da578a05a6b651776804786d813a Mon Sep 17 00:00:00 2001 From: Piotr Krysik Date: Tue, 7 Apr 2009 12:47:18 +0200 Subject: Added files from gr-howto-write-a-block --- config/onceonly.m4 | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 config/onceonly.m4 (limited to 'config/onceonly.m4') diff --git a/config/onceonly.m4 b/config/onceonly.m4 new file mode 100644 index 0000000..f6fec37 --- /dev/null +++ b/config/onceonly.m4 @@ -0,0 +1,63 @@ +# 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])) + ]) +]) -- cgit v1.2.3