* ldlang.h (struct lang_nocrossref): Define.
(struct lang_nocrossrefs): Define.
(nocrossref_list): Declare.
(lang_add_nocrossref): Declare.
* ldlex.l: Recognize NOCROSSREFS keyword.
* ldgram.y (%union): Add nocrossref field.
(NOCROSSREFS): New terminal.
(ifile_p1): Recognize NOCROSSREFS.
(nocrossref_list): New nonterminal.
* ldlang.c (nocrossref_list): Define.
(lang_add_nocrossref): New function.
* ldmain.c (main): If nocrossref_list is not NULL, call
check_nocrossrefs.
(warning_callback): Free symbols if there is no place to store
them.
(notice): Call add_cref if nocrossref_list is not NULL.
* ldcref.c: Include "ldexp.h" and "ldlang.h".
(check_nocrossrefs): New function.
(check_nocrossref): New static function.
(struct check_refs_info): Define.
(check_refs, check_reloc_refs): New static functions.
* Makefile.in: Rebuild dependencies.
* ld.texinfo (Option Commands): Document NOCROSSREFS.
