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Re: [PATCH] PR ld/20103: Skip an archive element if not added by linker

On Tue, May 17, 2016 at 11:49 PM, Alan Modra <> wrote:
> On Tue, May 17, 2016 at 07:24:08PM -0700, H.J. Lu wrote:
>> During archive rescan to resolve symbol references for files added by
>> LTO, linker add_archive_element callback is called to check if an
>> archive element should added.  After all IR symbols have been claimed,
>> linker won't claim new IR symbols and shouldn't add the LTO archive
>> element.  This patch updates linker add_archive_element callback to
>> return FALSE when seeing an LTO archive element during rescan and
>> changes ELF linker to skip such archive element.  Other linker backends
>> may also need similar update.
>> Tested on x86.  OK for master?
> Not without a lot more explanation and justification why this is
> correct, in particular the plugin_call_claim_file change.

plugin_call_claim_file is only called from plugin_object_p to check
if an input is IR, not really claim symbols. which is done by
plugin_call_all_symbols_read, which sets no_more_claiming.  Whether
an input is an IR file is independent of if there is more IR symbols to

During archive rescan, if plugin_object_p rejects an IR archive element,
linker will treat it as a non-IR element, which leads to error.  In stead
plugin_object_p should always accept an IR object,  We won't claim the
IR symbols when no_more_claiming is set. My change just makes linker
consistent on whether an input file is an IR file.


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