Currently declaring support for at most LLVM 9.
I'll be masking dev-util/perf[clang].
For the record, I did try to fix the build system to work with LLVM 10 and above, but unfortunately that is not enough. There were also API changes introduced in Clang 10 that will need to be addressed upstream by perf developers. Although I would have hoped that we could keep LLVM 9 for a bit longer to wait until upstreams themselves add support for LLVM 10 to their projects, I think that for perf the solution of just masking the use flag is fine.
To be fair, nobody replied in nearly a year ;)
Is there nothing upstream re even 10 support right now?