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annotate m4/alloca.m4 @ 5063:1aecdc8063ba

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alloca cleanup: always include <alloca.h>.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 17 May 2004 05:41:42 +0000
parents 069117fb861f
children 87c42e194f4a
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5063
1aecdc8063ba alloca cleanup: always include <alloca.h>.
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1 # alloca.m4 serial 4
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2 dnl Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
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7c1a6b73f48e An autoconf macro for its associated module.
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3 dnl This file is free software, distributed under the terms of the GNU
7c1a6b73f48e An autoconf macro for its associated module.
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4 dnl General Public License. As a special exception to the GNU General
7c1a6b73f48e An autoconf macro for its associated module.
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5 dnl Public License, this file may be distributed as part of a program
7c1a6b73f48e An autoconf macro for its associated module.
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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 AC_DEFUN([gl_FUNC_ALLOCA],
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10 [
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11 dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
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12 AC_REQUIRE([AC_PROG_CPP])
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13 AC_REQUIRE([AC_PROG_EGREP])
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14
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15 AC_REQUIRE([AC_FUNC_ALLOCA])
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16 if test $ac_cv_func_alloca_works = no; then
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17 gl_PREREQ_ALLOCA
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18 fi
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19
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20 # Define an additional variable used in the Makefile substitution.
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21 if test $ac_cv_working_alloca_h = yes; then
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22 AC_EGREP_CPP([Need own alloca], [
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23 #if defined __GNUC__ || defined _AIX || defined _MSC_VER
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24 Need own alloca
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25 #endif
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26 ],
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27 [AC_DEFINE(HAVE_ALLOCA, 1,
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28 [Define to 1 if you have `alloca' after including <alloca.h>,
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29 a header that may be supplied by this distribution.])
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30 ALLOCA_H=alloca.h],
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31 [ALLOCA_H=])
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32 else
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33 ALLOCA_H=alloca.h
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34 fi
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35 AC_SUBST([ALLOCA_H])
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36
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37 AC_DEFINE(HAVE_ALLOCA_H, 1,
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38 [Define HAVE_ALLOCA_H for backward compatibility with older code
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39 that includes <alloca.h> only if HAVE_ALLOCA_H is defined.])
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40 ])
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41
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42 # Prerequisites of lib/alloca.c.
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43 # STACK_DIRECTION is already handled by AC_FUNC_ALLOCA.
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44 AC_DEFUN([gl_PREREQ_ALLOCA], [:])