- if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
- && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
- TREE_TYPE (TREE_TYPE (old_decl)))
- && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
- {
- TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
- TREE_TYPE (decl1));
- current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
+ if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
+ old_decl = 0;
+ current_function_prototype_locus = UNKNOWN_LOCATION;
+ current_function_prototype_built_in = false;
+ current_function_prototype_arg_types = NULL_TREE;
+ if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
+ {
+ if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
+ && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
+ TREE_TYPE (TREE_TYPE (old_decl))))
+ {
+ TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
+ TREE_TYPE (decl1));
+ current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
+ current_function_prototype_built_in
+ = C_DECL_BUILTIN_PROTOTYPE (old_decl);
+ current_function_prototype_arg_types
+ = TYPE_ARG_TYPES (TREE_TYPE (decl1));
+ }
+ if (TREE_PUBLIC (decl1))
+ {
+ /* If there is an external prototype declaration of this
+ function, record its location but do not copy information
+ to this decl. This may be an invisible declaration
+ (built-in or in a scope which has finished) or simply
+ have more refined argument types than any declaration
+ found above. */
+ struct c_binding *b;
+ for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
+ if (B_IN_SCOPE (b, external_scope))
+ break;
+ if (b)
+ {
+ tree ext_decl, ext_type;
+ ext_decl = b->decl;
+ ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
+ if (TREE_CODE (ext_type) == FUNCTION_TYPE
+ && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
+ TREE_TYPE (ext_type)))
+ {
+ current_function_prototype_locus
+ = DECL_SOURCE_LOCATION (ext_decl);
+ current_function_prototype_built_in
+ = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
+ current_function_prototype_arg_types
+ = TYPE_ARG_TYPES (ext_type);
+ }
+ }
+ }