split of aclocal/acinclude

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

cf/check-declaration.m4

@@ -0,0 +1,30 @@
+dnl $Id$
+dnl
+dnl
+dnl Check if we need the declaration of a variable
+dnl
+
+dnl AC_HAVE_DECLARATION(includes, variable)
+AC_DEFUN(AC_CHECK_DECLARATION, [
+AC_MSG_CHECKING([if $2 is properly declared])
+AC_CACHE_VAL(ac_cv_var_$2_declaration, [
+AC_TRY_COMPILE([$1
+extern struct { int foo; } $2;],
+[$2.foo = 1;],
+eval "ac_cv_var_$2_declaration=no",
+eval "ac_cv_var_$2_declaration=yes")
+])
+
+ac_tr_var=[HAVE_]translit($2, [a-z], [A-Z])[_DECLARATION]
+
+define([foo], [HAVE_]translit($2, [a-z], [A-Z])[_DECLARATION])
+: << END
+@@@syms="$syms foo"@@@
+END
+undefine([foo])
+
+AC_MSG_RESULT($ac_cv_var_$2_declaration)
+if eval "test \"\$ac_cv_var_$2_declaration\" = yes"; then
+	AC_DEFINE_UNQUOTED($ac_tr_var)
+fi
+])