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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_check_define.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AC_CHECK_DEFINE([symbol], [ACTION-IF-FOUND], [ACTION-IF-NOT])
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# AX_CHECK_DEFINE([includes],[symbol], [ACTION-IF-FOUND], [ACTION-IF-NOT])
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#
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# DESCRIPTION
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#
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# Complements AC_CHECK_FUNC but it does not check for a function but for a
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# define to exist. Consider a usage like:
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#
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# AC_CHECK_DEFINE(__STRICT_ANSI__, CFLAGS="$CFLAGS -D_XOPEN_SOURCE=500")
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#
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# LICENSE
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#
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# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 9
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AU_ALIAS([AC_CHECK_DEFINED], [AC_CHECK_DEFINE])
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AC_DEFUN([AC_CHECK_DEFINE],[
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AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$1])dnl
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AC_CACHE_CHECK([for $1 defined], ac_var,
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
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#ifdef $1
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int ok;
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#else
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choke me
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#endif
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]])],[AS_VAR_SET(ac_var, yes)],[AS_VAR_SET(ac_var, no)]))
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AS_IF([test AS_VAR_GET(ac_var) != "no"], [$2], [$3])dnl
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AS_VAR_POPDEF([ac_var])dnl
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])
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AU_ALIAS([AX_CHECK_DEFINED], [AX_CHECK_DEFINE])
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AC_DEFUN([AX_CHECK_DEFINE],[
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AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$2_$1])dnl
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AC_CACHE_CHECK([for $2 defined in $1], ac_var,
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <$1>]], [[
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#ifdef $2
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int ok;
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#else
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choke me
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#endif
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]])],[AS_VAR_SET(ac_var, yes)],[AS_VAR_SET(ac_var, no)]))
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AS_IF([test AS_VAR_GET(ac_var) != "no"], [$3], [$4])dnl
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AS_VAR_POPDEF([ac_var])dnl
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])
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AC_DEFUN([AX_CHECK_FUNC],
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[AS_VAR_PUSHDEF([ac_var], [ac_cv_func_$2])dnl
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AC_CACHE_CHECK([for $2], ac_var,
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dnl AC_LANG_FUNC_LINK_TRY
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([$1
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#undef $2
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char $2 ();],[
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char (*f) () = $2;
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return f != $2; ])],
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[AS_VAR_SET(ac_var, yes)],
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[AS_VAR_SET(ac_var, no)])])
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AS_IF([test AS_VAR_GET(ac_var) = yes], [$3], [$4])dnl
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AS_VAR_POPDEF([ac_var])dnl
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])# AC_CHECK_FUNC
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