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

[andi-gcc at firstfloor dot org]

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

--- Comment #12 from Andi Kleen <andi-gcc at firstfloor dot org> ---
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)