Correct internal prototype of __builtin_saveregs

[Zack Weinberg]

When compiling libgcc on targets that don't need a specialized
__builtin_saveregs, we get a warning about no previous prototype for
the function, despite the fact that it's prototyped in libgcc2.h. This
is because the internal declaration has no prototype.

This patch changes c_common_nodes_and_builtins such that __builtin_saveregs
is given a (void) prototype.  __builtin_apply_args and __builtin_next_arg
keep their unspecified prototype.

[Are these routines still used?  They appear to be only for the old
varargs implementation.]

Bootstrapped i386-linux.  OK to commit?

zw

	* c-common.c (c_common_nodes_and_builtins): Add ptr_ftype_any
	function type.  Change ptr_ftype to be void * (void).  Give
	__builtin_next_arg and __builtin_apply_args ptr_ftype_any.

===================================================================
Index: c-common.c
--- c-common.c	2000/07/31 14:00:34	1.129
+++ c-common.c	2000/08/02 17:06:31
@@ -3424,7 +3424,7 @@ c_common_nodes_and_builtins (cplus_mode,
   tree bzero_ftype, bcmp_ftype;
   tree endlink, int_endlink, double_endlink, unsigned_endlink;
   tree sizetype_endlink;
-  tree ptr_ftype, ptr_ftype_unsigned;
+  tree ptr_ftype_any, ptr_ftype, ptr_ftype_unsigned;
   tree void_ftype_any, void_ftype_int, int_ftype_any;
   tree double_ftype_double, double_ftype_double_double;
   tree float_ftype_float, ldouble_ftype_ldouble;
@@ -3465,7 +3465,8 @@ c_common_nodes_and_builtins (cplus_mode,
   double_endlink = tree_cons (NULL_TREE, double_type_node, endlink);
   unsigned_endlink = tree_cons (NULL_TREE, unsigned_type_node, endlink);
 
-  ptr_ftype = build_function_type (ptr_type_node, NULL_TREE);
+  ptr_ftype_any = build_function_type (ptr_type_node, NULL_TREE);
+  ptr_ftype = build_function_type (ptr_type_node, endlink);
   ptr_ftype_unsigned = build_function_type (ptr_type_node, unsigned_endlink);
   sizetype_endlink = tree_cons (NULL_TREE, TYPE_DOMAIN (sizetype), endlink);
   /* We realloc here because sizetype could be int or unsigned.  S'ok.  */
@@ -3633,7 +3634,7 @@ c_common_nodes_and_builtins (cplus_mode,
 		    BUILT_IN_NORMAL, NULL_PTR);
   builtin_function ("__builtin_classify_type", default_function_type,
 		    BUILT_IN_CLASSIFY_TYPE, BUILT_IN_NORMAL, NULL_PTR);
-  builtin_function ("__builtin_next_arg", ptr_ftype, BUILT_IN_NEXT_ARG,
+  builtin_function ("__builtin_next_arg", ptr_ftype_any, BUILT_IN_NEXT_ARG,
 		    BUILT_IN_NORMAL, NULL_PTR);
   builtin_function ("__builtin_args_info", int_ftype_int, BUILT_IN_ARGS_INFO,
 		    BUILT_IN_NORMAL, NULL_PTR);
@@ -3667,7 +3668,7 @@ c_common_nodes_and_builtins (cplus_mode,
 		    BUILT_IN_ISUNORDERED, BUILT_IN_NORMAL, NULL_PTR);
 
   /* Untyped call and return.  */
-  builtin_function ("__builtin_apply_args", ptr_ftype,
+  builtin_function ("__builtin_apply_args", ptr_ftype_any,
 		    BUILT_IN_APPLY_ARGS, BUILT_IN_NORMAL, NULL_PTR);
 
   temp = tree_cons (NULL_TREE,