Hello,
We have a somewhat long-recognized problem with LTO vs. symbols referenced
in inline asm statements. For extended asms, the solution is easy: just
mention the symbol in constraints. For toplevel asms, this is trickier, as
they cannot have constraints.
I think a good solution for toplevel a
On Thu, Jun 14, 2018 at 1:19 PM Alexander Monakov wrote:
>
> Hello,
>
> We have a somewhat long-recognized problem with LTO vs. symbols referenced
> in inline asm statements. For extended asms, the solution is easy: just
> mention the symbol in constraints. For toplevel asms, this is trickier, as
On Thu, 14 Jun 2018, Richard Biener wrote:
> Can you make sure to add a testcase?
Apologies, I got a bit too excited and forgot that my local testcase had
void *unused_ref = &foo;
which masked another issue: unreferenced declarations won't even appear
in the symtab, even if they have __attri
On Thu, 14 Jun 2018, Alexander Monakov wrote:
> However, it is not added to LTO streamed-out symtab, so WPA does not see it.
>
> If the direction looks fine overall, I'll look into getting over this
> streaming hurdle (hints much appreciated).
Well, going down this rabbit hole is a fine exercise,
