It is unrecognized in new builds. We still need to enforce our c++ dialect on TAPI's parser, so we may need to find another way to pass this, if -fvisibility=none is not enough.
<rdar://problem/116350284>
Pull request: https://github.com/WebKit/WebKit/pull/19905
Committed 270147@main (27372a0ce8a5): <https://commits.webkit.org/270147@main> Reviewed commits have been landed. Closing PR #19905 and removing active labels.