On Wed, 23 Sep 2020, Richard Biener wrote:
> On Wed, 23 Sep 2020, Tobias Burnus wrote:
>
> > (Pre-remark: the following applies to the host; the offloading
> > is only involved as otherwise the (.gnu.)offload_{vars,funcs}
> > global variable/table wouldn't exist.)
> >
> > Due to partitioning, it can happen that the offloading table
> > and the functions and variables (which it contains as pointer),
> > end up in different ltrans. As the functions and vars end
> > up as local symbols ? the linker will not associate the entries
> > in the table of one ltrans with the symbol from the other ltrans,
> > failing with "undefined reference" errors.
> >
> >
> > This could be fixed properly by either placing all vars/funcs
> > referenced in the (.gnu.)offload_{vars,funcs} table in the same
> > ltrans parition ? or by ensuring that those symbols are available.
> > For funcs, the latter works by setting TREE_PUBLIC (cf. PR) ? but
> > I didn't manage to do this for variables. ? Hence:
> >
> > This patch disables lto partitioning if the code has offloading.
> >
> > OK for mainline? ? Or better suggestions how to handle this?
>
> LTRANS usually makes the symbols hidden, not local. So are you
> sure this isn't a target bug (hidden symbols not implemented
> but the host compiler obviously having checked that but assuming
> the target behaves the same as the host) or a linker bug?
See lto/lto-partition.c:promote_symbol btw
Richard.
> Richard.
>
> > Tobias
> >
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>
>
--
Richard Biener <[email protected]>
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