14.15 min  100.0% 0 s   lldb-rpc-server (42247)
14.15 min   99.9% 0 s    thread_start
14.15 min   99.9% 0 s     _pthread_start
12.99 min   91.7% 0 s      threadFuncSync(void*)
12.99 min   91.7% 0 s       RunSafelyOnThread_Dispatch(void*)
12.99 min   91.7% 0 s        llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
12.99 min   91.7% 0 s         void llvm::function_ref<void ()>::callback_fn<compileModuleImpl(clang::CompilerInstance&, clang::SourceLocation, llvm::StringRef, clang::FrontendInputFile, llvm::StringRef, llvm::StringRef, llvm::function_ref<void (clang::CompilerInstance&)>, llvm::function_ref<void (clang::CompilerInstance&)>)::$_3>(long)

Extra clang arguments        : (28814 items)

swift::ClangImporterOptions &clang_importer_options =
      GetClangImporterOptions();
  log->Printf("  Extra clang arguments        : (%llu items)",
              (unsigned long long)clang_importer_options.ExtraArgs.size());
  for (std::string &extra_arg : clang_importer_options.ExtraArgs) {
    log->Printf("    %s", extra_arg.c_str());
  }

std::function<void(ModuleSP &&)> process_one_module =
      [&](ModuleSP &&module_sp) {
        <...>
        SwiftASTContext *ast_context =
            llvm::dyn_cast_or_null<SwiftASTContext>(&*type_system_or_err);
        if (ast_context && !ast_context->HasErrors()) {
            <...>
            swift_ast_sp->AddExtraClangArgs(ast_context->GetClangArguments());
          }
        }
      };
  for (size_t mi = 0; mi != num_images; ++mi) {
    process_one_module(target.GetImages().GetModuleAtIndex(mi));
  }

-add_ast_path path/to/swift/module1.swiftmodule
-add_ast_path path/to/swift/module2.swiftmodule
...
-add_ast_path path/to/swift/moduleN.swiftmodule

import ClangModule1
import ClangModule2
...
import ClangModuleN

Extra clang arguments        : (962 items)

3.99 min  100.0%  0 s   lldb-rpc-server (44423)
3.99 min   99.9%  0 s    thread_start
3.99 min   99.9%  0 s     _pthread_start
2.96 min   74.3%  0 s      threadFuncSync(void*)
2.96 min   74.3%  0 s       RunSafelyOnThread_Dispatch(void*)
2.96 min   74.3%  0 s        llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
2.96 min   74.3%  0 s         void llvm::function_ref<void ()>::callback_fn<compileModuleImpl(clang::CompilerInstance&, clang::SourceLocation, llvm::StringRef, clang::FrontendInputFile, llvm::StringRef, llvm::StringRef, llvm::function_ref<void (clang::CompilerInstance&)>, llvm::function_ref<void (clang::CompilerInstance&)>)::$_3>(long)