The link phase is always partial (-r) for VxWorks in kernel mode, which
means that it uses incremental LTO linking by default (-flinker-output=rel).
But in this mode the LTO plugin outputs a warning if one of the object files
involved in the link does not contain LTO bytecode, before switching to
nolto-rel mode. We do not do repeated incremental linking for VxWorks so
silence the warning.
lto-plugin/
* lto-plugin.c: Document -linker-output-auto-notlo-rel option.
(linker_output_set): Change type to bool.
(linker_output_known): Likewise.
(linker_output_auto_nolto_rel): New variable.
(all_symbols_read_handler): Take it into account.
<LDPO_REL>: Do not issue the warning if it is set.
(process_option): Process -linker-output-auto-notlo-rel.
(cleanup_handler): Remove unused variable.
(onload) <LDPT_LINKER_OUTPUT>: Adjust to above type change.
gcc/
* gcc.c (LTO_PLUGIN_SPEC): Define if not already.
(LINK_PLUGIN_SPEC): Execute LTO_PLUGIN_SPEC.
* config/vxworks.h (LTO_PLUGIN_SPEC): Define.
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