* c-decl.c (grokfield): Don't allow typedefs for structures or
	unions with no tag by default.
	* doc/extend.texi (Unnamed Fields): Update.

testsuite:
	* gcc.dg/c1x-anon-struct-1.c: Don't test use of typedefs.
	* gcc.dg/c1x-anon-struct-3.c: New test.
	* gcc.dg/anon-struct-11.c: Update.

From-SVN: r171170