llvm-project

bd3dde0f - [clang][Modules] Diagnose mismatching pcm dependencies in explicit buiilds (#137068)

[clang][Modules] Diagnose mismatching pcm dependencies in explicit buiilds (#137068) In an explicit build, the dependency scanner generates invocations with dependencies to module files to use during compilation. The pcm's passed in the invocations should match the ones that were imported by other modules that share the same dependencies. We have seen bugs caused from incorrect invocations that mismatch which module file to load. When this happens report it as a warning, to help with investigations, as that should never occur in a well behaved build scheduled from the dependency scanner. The warning flag is off by default.