(In reply to Hi-Angel from comment #2)
> (In reply to Adam Jackson from comment #1)
> > Mesa doesn't implement EGL_EXT_device_enumeration yet, so this isn't
> > entirely surprising.
> 
> Then, shouldn't I be getting either linking or calling errors?

Linking - yes things should fail fail at linking. The spec clearly says that
one should use eglGetProcAddress to get the function pointers.

Runtime - nope. The extension defines the means, a device is not guaranteed.

Also ... I really hope that Nvidia fixes that blog - it contains a number of
fairly fundamental issues.
I reached out to the author ~1year ago listing all the bad stuff but never
heard back :-\ Oh well