Merge pull request #8119 from huonw/imported-modules

lib/Driver/Driver.cpp

@@ -1094,6 +1094,14 @@ void Driver::buildOutputInfo(const ToolChain &TC, const DerivedArgList &Args,
       OI.CompilerOutputType = types::TY_PCH;
       break;
 
+    case options::OPT_emit_imported_modules:
+      OI.CompilerOutputType = types::TY_ImportedModules;
+      // We want the imported modules from the module as a whole, not individual
+      // files, so let's do it in one invocation rather than having to collate
+      // later.
+      OI.CompilerMode = OutputInfo::Mode::SingleCompile;
+      break;
+
     case options::OPT_parse:
     case options::OPT_typecheck:
     case options::OPT_dump_parse:
@@ -1386,6 +1394,7 @@ void Driver::buildActions(const ToolChain &TC,
       case types::TY_SwiftDeps:
       case types::TY_Remapping:
       case types::TY_PCH:
+      case types::TY_ImportedModules:
         // We could in theory handle assembly or LLVM input, but let's not.
         // FIXME: What about LTO?
         Diags.diagnose(SourceLoc(), diag::error_unexpected_input_file,