Comment # 40 on bug 1185952 from Aaron Puchert

(In reply to Reinhard Max from comment #39)
> I've seen this happen on all three versions of PostgreSQL that support LLVM
> (11, 12 and 13), but only on s390x and only in about 4 out of 5 build runs
> (within the short period over which I monitored it).

Since it comes from ld (or collect2?) and that's an LTO link, I suppose it
might be a race condition. I agree, it should be a separate bug. Maybe add
Michael Matz for binutils and Martin Liska for GCC LTO. IBM tends to have
weaker memory models, and that race might just not materialize with the
stronger model of x86.