@icedquinn @mischievoustomato @novenary @wolf480pl GNU basically never documents their extensions, this is why I say they do vendor-locking.
But that should only matter for ones where you don't have proper third-party implementations/documentations, which here you absolutely did.

Like if EAC wanted, they could be like "Nope, we're doing ld.so ourselves" (probably a terribly bad idea btw) and they would be able to implement gnu_hash support easily.