include/alloca-conf.h

/* Copyright (C) 2012-2025 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "config.h"

/* This is a merge of code recommended in the autoconf-2.61 documentation
   with that recommended in the autoconf-2.13 documentation, with added
   tweaks to heed C_ALLOCA.  */

#if defined HAVE_ALLOCA_H && !defined C_ALLOCA
# include <alloca.h>
#else
# if defined __GNUC__ && !defined C_ALLOCA
#  if !defined alloca
#   define alloca __builtin_alloca
#  endif
# else
#  if defined _AIX
/* Indented so that pre-ansi C compilers will ignore it, rather than
   choke on it.  Some versions of AIX require this to be the first
   thing seen by the compiler except for comments and preprocessor
   directives.  */
    #pragma alloca
#  else
#   if defined _MSC_VER && !defined C_ALLOCA
#    include <malloc.h>
#    define alloca _alloca
#   else
#    if !defined alloca
#     if defined __STDC__ || defined __hpux
#      if defined HAVE_STDDEF_H
#       include <stddef.h>
#       if defined  __cplusplus
extern "C" void *alloca (size_t);
#       else
extern void *alloca (size_t);
#       endif
#      else
extern void *alloca ();
#      endif
#     else
extern char *alloca ();
#     endif
#    endif
#   endif
#  endif
# endif
#endif