~auto(conf|make)~

1 files changed, 76 insertions, 0 deletions

diff --git a/m4/ax_check_typedef.m4 b/m4/ax_check_typedef.m4
new file mode 100644
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+++ b/m4/ax_check_typedef.m4
@@ -0,0 +1,76 @@
+# ===========================================================================
+#     http://www.gnu.org/software/autoconf-archive/ax_check_typedef.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_TYPEDEF(TYPEDEF, HEADER [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]])
+#
+# DESCRIPTION
+#
+#   Check if the given typedef-name is recognized as a type. The trick is to
+#   use a sizeof(TYPEDEF) and see if the compiler is happy with that.
+#
+#   This can be thought of as a mixture of AC_CHECK_TYPE(TYPEDEF,DEFAULT)
+#   and AC_CHECK_LIB(LIBRARY,FUNCTION,ACTION-IF-FOUND,ACTION-IF-NOT-FOUND).
+#
+#   A convenience macro AX_CHECK_TYPEDEF_ is provided that will not emit any
+#   message to the user - it just executes one of the actions.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#
+#   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/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 5
+
+AU_ALIAS([AC_CHECK_TYPEDEF], [AX_CHECK_TYPEDEF])
+AC_DEFUN([AX_CHECK_TYPEDEF_],
+[dnl
+ac_lib_var=`echo $1['_']$2 | sed 'y%./+-%__p_%'`
+AC_CACHE_VAL(ac_cv_lib_$ac_lib_var,
+[ eval "ac_cv_type_$ac_lib_var='not-found'"
+  ac_cv_check_typedef_header=`echo ifelse([$2], , stddef.h, $2)`
+  AC_TRY_COMPILE( [#include <$ac_cv_check_typedef_header>],
+	[int x = sizeof($1); x = x;],
+        eval "ac_cv_type_$ac_lib_var=yes" ,
+        eval "ac_cv_type_$ac_lib_var=no" )
+  if test `eval echo '$ac_cv_type_'$ac_lib_var` = "no" ; then
+     ifelse([$4], , :, $4)
+  else
+     ifelse([$3], , :, $3)
+  fi
+])])
+
+dnl AX_CHECK_TYPEDEF(TYPEDEF, HEADER [, ACTION-IF-FOUND,
+dnl    [, ACTION-IF-NOT-FOUND ]])
+AC_DEFUN([AX_CHECK_TYPEDEF],
+[dnl
+ AC_MSG_CHECKING([for $1 in $2])
+ AX_CHECK_TYPEDEF_($1,$2,AC_MSG_RESULT(yes),AC_MSG_RESULT(no))dnl
+])