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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_define.html
# ===========================================================================
#
# SYNOPSIS
#
# AC_CHECK_DEFINE([symbol], [ACTION-IF-FOUND], [ACTION-IF-NOT])
# AX_CHECK_DEFINE([includes],[symbol], [ACTION-IF-FOUND], [ACTION-IF-NOT])
#
# DESCRIPTION
#
# Complements AC_CHECK_FUNC but it does not check for a function but for a
# define to exist. Consider a usage like:
#
# AC_CHECK_DEFINE(__STRICT_ANSI__, CFLAGS="$CFLAGS -D_XOPEN_SOURCE=500")
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 11
AU_ALIAS([AC_CHECK_DEFINED], [AC_CHECK_DEFINE])
AC_DEFUN([AC_CHECK_DEFINE],[
AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$1])dnl
AC_CACHE_CHECK([for $1 defined], ac_var,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
#ifdef $1
int ok;
(void)ok;
#else
choke me
#endif
]])],[AS_VAR_SET(ac_var, yes)],[AS_VAR_SET(ac_var, no)]))
AS_IF([test AS_VAR_GET(ac_var) != "no"], [$2], [$3])dnl
AS_VAR_POPDEF([ac_var])dnl
])
AU_ALIAS([AX_CHECK_DEFINED], [AX_CHECK_DEFINE])
AC_DEFUN([AX_CHECK_DEFINE],[
AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$2_$1])dnl
AC_CACHE_CHECK([for $2 defined in $1], ac_var,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <$1>]], [[
#ifdef $2
int ok;
(void)ok;
#else
choke me
#endif
]])],[AS_VAR_SET(ac_var, yes)],[AS_VAR_SET(ac_var, no)]))
AS_IF([test AS_VAR_GET(ac_var) != "no"], [$3], [$4])dnl
AS_VAR_POPDEF([ac_var])dnl
])
AC_DEFUN([AX_CHECK_FUNC],
[AS_VAR_PUSHDEF([ac_var], [ac_cv_func_$2])dnl
AC_CACHE_CHECK([for $2], ac_var,
dnl AC_LANG_FUNC_LINK_TRY
[AC_LINK_IFELSE([AC_LANG_PROGRAM([$1
#undef $2
char $2 ();],[
char (*f) () = $2;
return f != $2; ])],
[AS_VAR_SET(ac_var, yes)],
[AS_VAR_SET(ac_var, no)])])
AS_IF([test AS_VAR_GET(ac_var) = yes], [$3], [$4])dnl
AS_VAR_POPDEF([ac_var])dnl
])# AC_CHECK_FUNC
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