dnl Typecheck macro from GnuPG
dnl Copyright (C) 2001 Free Software Foundation, Inc.
dnl
dnl This file is part of Libksba.
dnl
dnl Libksba is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as
dnl published by the Free Software Foundation; either version 3 of
dnl the License, or (at your option) any later version.
dnl
dnl Libksba is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU Lesser General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program.  If not, see <http://www.gnu.org/licenses/>.


dnl GNUPG_CHECK_TYPEDEF(TYPE, HAVE_NAME)
dnl Check whether a typedef exists and create a #define $2 if it exists
dnl
AC_DEFUN([GNUPG_CHECK_TYPEDEF],
  [ AC_MSG_CHECKING(for $1 typedef)
    AC_CACHE_VAL(gnupg_cv_typedef_$1,
    [AC_TRY_COMPILE([#define _GNU_SOURCE 1
    #include <stdlib.h>
    #include <sys/types.h>], [
    #undef $1
    int a = sizeof($1);
    ], gnupg_cv_typedef_$1=yes, gnupg_cv_typedef_$1=no )])
    AC_MSG_RESULT($gnupg_cv_typedef_$1)
    if test "$gnupg_cv_typedef_$1" = yes; then
        AC_DEFINE($2,1,[Defined if a `]$1[' is typedef'd])
    fi
  ])