[clang] [clang-tools-extra] [llvm] [clang] Introduce diagnostics suppression mappings (PR #112517)

[kadir çetinkaya via cfe-commits]

kadircet wrote:

so https://github.com/llvm/llvm-project/commit/12e3ed8de8c6063b15916b3faf67c8c9cd17df1f should resolve both lldb buildbot breakage and compile time regression in clang.

that being said, I don't think https://github.com/llvm/llvm-project/commit/12e3ed8de8c6063b15916b3faf67c8c9cd17df1f
is the right fix for lldb breakage. I think this change reveals an actual bug in lldb's handling of modules, but I can't repro locally. I hit a similar issue with clang-repl during development, you can find the relevant fix in https://github.com/llvm/llvm-project/pull/112517/files#diff-23c4b4ecf706e1f0b594e365095a343594e3978b47991718782e1f76064f241a.

Basically I think LLDB is doing something similar, it's probably loading/building modules with one SourceManager and then it's trying to consume them using another. @Michael137, If you can provide more detailed instructions about how to set up a similar testing environment in linux (I couldn't get the std-modules bit to work), or if you can provide a detailed stack trace from assertion failure, I can try to dig deeper.

https://github.com/llvm/llvm-project/pull/112517