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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [gdb/] [gnulib/] [m4/] [onceonly.m4] - Rev 859
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# onceonly.m4 serial 6 dnl Copyright (C) 2002-2003, 2005-2006, 2008-2010 Free Software Foundation, dnl 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_FUNC_STRCOLL]) like AC_FUNC_STRCOLL 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 The original code implemented AC_CHECK_HEADERS_ONCE and AC_CHECK_FUNCS_ONCE dnl in terms of AC_DEFUN and AC_REQUIRE. This implementation uses diversions to dnl named sections DEFAULTS and INIT_PREPARE in order to check all requested dnl headers at once, thus reducing the size of 'configure'. It is known to work dnl with autoconf 2.57..2.62 at least . The size reduction is ca. 9%. dnl Autoconf version 2.59 plus gnulib is required; this file is not needed dnl with Autoconf 2.60 or greater. But note that autoconf's implementation of dnl AC_CHECK_DECLS_ONCE expects a comma-separated list of symbols as first dnl argument! AC_PREREQ([2.59]) # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of # AC_CHECK_HEADERS(HEADER1 HEADER2 ...). AC_DEFUN([AC_CHECK_HEADERS_ONCE], [ : m4_foreach_w([gl_HEADER_NAME], [$1], [ AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, [./-], [___])), [ m4_divert_text([INIT_PREPARE], [gl_header_list="$gl_header_list gl_HEADER_NAME"]) gl_HEADERS_EXPANSION AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_HEADER_NAME])), [Define to 1 if you have the <]m4_defn([gl_HEADER_NAME])[> header file.]) ]) AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, [./-], [___]))) ]) ]) m4_define([gl_HEADERS_EXPANSION], [ m4_divert_text([DEFAULTS], [gl_header_list=]) AC_CHECK_HEADERS([$gl_header_list]) m4_define([gl_HEADERS_EXPANSION], []) ]) # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of # AC_CHECK_FUNCS(FUNC1 FUNC2 ...). AC_DEFUN([AC_CHECK_FUNCS_ONCE], [ : m4_foreach_w([gl_FUNC_NAME], [$1], [ AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [ m4_divert_text([INIT_PREPARE], [gl_func_list="$gl_func_list gl_FUNC_NAME"]) gl_FUNCS_EXPANSION AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_FUNC_NAME])), [Define to 1 if you have the `]m4_defn([gl_FUNC_NAME])[' function.]) ]) AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME])) ]) ]) m4_define([gl_FUNCS_EXPANSION], [ m4_divert_text([DEFAULTS], [gl_func_list=]) AC_CHECK_FUNCS([$gl_func_list]) m4_define([gl_FUNCS_EXPANSION], []) ]) # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of # AC_CHECK_DECLS(DECL1, DECL2, ...). AC_DEFUN([AC_CHECK_DECLS_ONCE], [ : m4_foreach_w([gl_DECL_NAME], [$1], [ AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [ AC_CHECK_DECLS(m4_defn([gl_DECL_NAME])) ]) AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME])) ]) ])
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