split of aclocal/acinclude

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@4191 ec53bebd-3082-4978-b11e-865c3cabbd6b

cf/check-var.m4

@@ -0,0 +1,25 @@
+dnl $Id$
+dnl
+dnl AC_CHECK_VAR(includes, variable)
+AC_DEFUN(AC_CHECK_VAR, [
+AC_MSG_CHECKING(for $2)
+AC_CACHE_VAL(ac_cv_var_$2, [
+AC_TRY_LINK([extern int $2;
+int foo() { return $2; }],
+	    [foo()],
+	    ac_cv_var_$2=yes, ac_cv_var_$2=no)
+])
+eval "ac_tr_var=[HAVE_]translit($2,[a-z],[A-Z])"
+
+define([foo], [HAVE_]translit($2, [a-z], [A-Z]))
+: << END
+@@@syms="$syms foo"@@@
+END
+undefine([foo])
+
+AC_MSG_RESULT(`eval echo \\$ac_cv_var_$2`)
+if test `eval echo \\$ac_cv_var_$2` = yes; then
+	AC_DEFINE_UNQUOTED($ac_tr_var)
+	AC_CHECK_DECLARATION([$1],[$2])
+fi
+])