[Bug lto/95928] LTO through ar breaks weak function resolution

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95928

--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Andi Kleen from comment #12)
> Okay. I only compared gcc-7 (working) vs gcc-9 (broken), but always with LTO.
> 
> Looking at the kernel link it also uses --whole-archive. Perhaps that makes
> a difference?
> 
> I'll redo the test case with --whole-archive (will need some fixes)

--whole-archive makes the difference.