llvm-project

9fc54c0e - [clang][DebugInfo][gmodules] Set runtimeLang on ObjC forward declarations (#120154)

[clang][DebugInfo][gmodules] Set runtimeLang on ObjC forward declarations (#120154) In Objective-C, forward declarations are currently represented as: ``` DW_TAG_structure_type DW_AT_name ("Foo") DW_AT_declaration (true) DW_AT_APPLE_runtime_class (DW_LANG_ObjC) ``` However, when compiling with `-gmodules`, when a class definition is turned into a forward declaration within a `DW_TAG_module`, the DIE for the forward declaration looks as follows: ``` DW_TAG_structure_type DW_AT_name ("Foo") DW_AT_declaration (true) ``` Note the absence of `DW_AT_APPLE_runtime_class`. With recent changes in LLDB, not being able to differentiate between C++ and Objective-C forward declarations has become problematic (see attached test-case and explanation in https://github.com/llvm/llvm-project/pull/119860).