[clang] [Clang] Don't diagnose missing members when looking at the instantiating class template (PR #180725)

[Dimitry Andric via cfe-commits]

DimitryAndric wrote:

> @DimitryAndric if you want to test it with qt5

It fixes the reduced test case from #179118, the test case extracted as a separate set of files from qt5-webengine, and I can even build the full qt5-webengine port with it now! So from here everything looks OK. I think your patch is also nice and minimalist, I will have no problems applying it to my local copy of clang 21.


https://github.com/llvm/llvm-project/pull/180725