re PR middle-end/64313 (gcc.dg/torture/builtin-explog-1.c fails on bare-metal targets)

2015-01-21  Richard Biener  <rguenther@suse.de>

	PR middle-end/64313
	* tree-core.h (builtin_info, builtin_info_type): Turn from
	an object with two arrays into an array of an object with
	decl and two flags, implicit_p and declared_p.
	* tree.h (builtin_decl_explicit, builtin_decl_implicit,
	set_builtin_decl, set_builtin_decl_implicit_p,
	builtin_decl_explicit_p, builtin_decl_implicit_p): Adjust.
	(set_builtin_decl_declared_p, builtin_decl_declared_p): New functions.
	* builtins.c (builtin_info): Adjust.
	* gimplify.c (gimplify_addr_expr): References to builtins
	that have been declared by the user makes them eligible for
	use by the compiler.  Call set_builtin_decl_implicit_p on them.

	c/
	* c-decl.c (merge_decls): Call set_builtin_decl_declared_p
	for builtins the user declared correctly.

	cp/
	* decl.c (duplicate_decls): Call set_builtin_decl_declared_p
	for builtins the user declared correctly.

From-SVN: r219928