m4/alloca.m4

   1 # alloca.m4 serial 2
   2 dnl Copyright (C) 2002-2003 Free Software Foundation, Inc.
   3 dnl This file is free software, distributed under the terms of the GNU
   4 dnl General Public License.  As a special exception to the GNU General
   5 dnl Public License, this file may be distributed as part of a program
   6 dnl that contains a configuration script generated by Autoconf, under
   7 dnl the same distribution terms as the rest of that program.
   8
   9 AC_DEFUN([gl_FUNC_ALLOCA],
  10 [
  11   dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
  12   AC_REQUIRE([AC_PROG_CPP])
  13   AC_REQUIRE([AC_PROG_EGREP])
  14
  15   AC_REQUIRE([AC_FUNC_ALLOCA])
  16   if test $ac_cv_func_alloca_works = no; then
  17     gl_PREREQ_ALLOCA
  18   fi
  19
  20   # Define an additional variable used in the Makefile substitution.
  21
  22   AC_EGREP_CPP([Need own alloca], [
  23 #if defined __GNUC__ || defined _MSC_VER || !HAVE_ALLOCA_H
  24   Need own alloca
  25 #endif
  26     ],
  27     ALLOCA_H=alloca.h,
  28     ALLOCA_H=)
  29   AC_SUBST([ALLOCA_H])
  30 ])
  31
  32 # Prerequisites of lib/alloca.c.
  33 # STACK_DIRECTION is already handled by AC_FUNC_ALLOCA.
  34 AC_DEFUN([gl_PREREQ_ALLOCA], [
  35   AC_CHECK_HEADERS_ONCE(stdlib.h string.h)
  36 ])