[llvm] [offload] Add missing build dependency (PR #149326)

[via llvm-commits]

jprotze wrote:

I'm not completely sure, what you mean with _bootstrapping_ here, but I would say: No!

It affects building the whole llvm-project, even when using a llvm build from the same sources (built without offload). The problem is that for compiling the runtimes, we use the clang from the outer build directory, but it doesn't have the includes available at this point.

I tried to understand the dependencies in the ninja build file. I think that all other targets in offload have a dependency on some inc files that are processes with offload-tblgen and therefore have a dependency on offload-tblgen.

https://github.com/llvm/llvm-project/pull/149326