The initial purpose is to workaround the LLVM bug
https://llvm.org/bugs/show_bug.cgi?id=26554 for OpenBSD.
By default, the `cpu' is defined to `generic`. But with a 64bit
processor, the optimization for `generic` will use invalid asm code as
NOP (the generated code for NOP isn't a NOP).
According to #20777, "x86-64" is the right thing to do for x86_64
builds.
Closes: #31363
pub fn target() -> Target {
let mut base = super::openbsd_base::opts();
+ base.cpu = "x86-64".to_string();
base.pre_link_args.push("-m64".to_string());
Target {