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.