gdb/

gdb/
	* cli/cli-cmds.h (error_no_arg): Remove.  Move the comment ...
	* command.h (error_no_arg): ... here.  Remove NORETURN, change
	ATTR_NORETURN to ATTRIBUTE_NORETURN.
	* defs.h (NORETURN, ATTR_NORETURN): Remove.
	(perror_with_name, verror, error, error_stream, vfatal, fatal)
	(internal_verror, internal_error, nomem): Remove NORETURN, change
	ATTR_NORETURN to ATTRIBUTE_NORETURN.
	* exceptions.c (throw_exception, deprecated_throw_reason, throw_verror)
	(throw_vfatal, throw_error): Remove NORETURN.
	(throw_it): Remove NORETURN, change ATTR_NORETURN to ATTRIBUTE_NORETURN.
	* exceptions.h (throw_exception, throw_verror, throw_vfatal)
	(throw_error, deprecated_throw_reason): Remove NORETURN, change
	ATTR_NORETURN to ATTRIBUTE_NORETURN.
	* linespec.c (cplusplus_error): Remove NORETURN, change ATTR_NORETURN
	to ATTRIBUTE_NORETURN for prototype, for the definition only remove
	NORETURN.
	* remote-mips.c (mips_error): Change NORETURN to ATTRIBUTE_NORETURN.
	* remote-sim.c (gdb_os_error): Change ATTR_NORETURN to
	ATTRIBUTE_NORETURN.
	* target.c (tcomplain): Likewise.
	* target.h (noprocess): Remove NORETURN, change ATTR_NORETURN to
	ATTRIBUTE_NORETURN.
	* utils.c (verror, error, vfatal, fatal, error_stream, internal_verror)
	(internal_error, perror_with_name, nomem): Remove NORETURN.
	* xml-support.h (gdb_xml_error): Change ATTR_NORETURN to
	ATTRIBUTE_NORETURN.

gdb/doc/
	* gdbint.texinfo (Host Definition): Remove items NORETURN and
	ATTR_NORETURN.