Why are extern(C/C++) definitions and references mangled differently in separately compiled modules?

[Max Samukha]

On Friday, 6 September 2019 at 15:32:07 UTC, 0xEAB wrote:
> On Friday, 6 September 2019 at 15:09:22 UTC, Max Samukha wrote:
>> Consider the following two modules:
>
> What compiler version are you using?

DMD64 D Compiler v2.088.0-1-g4011382ea, linux