isNullFunctionPointer() can fail for symbols not explicitly marked as weakly linked.
Created attachment 396499 [details]
Committed r260129: <https://trac.webkit.org/changeset/260129>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 396499 [details].
I don't think this is the right approach for this. If we are going to change libWebRTC, I think we should add a non-function symbol to use to check weak-linkage. And we should remove isNullFunctionPointer() or fix it it, but not leave it half working (see https://bugs.webkit.org/show_bug.cgi?id=208873)