C++ Modules TS: add frontend support for building pcm files from module

interface files. At the moment, all declarations (and no macros) are exported,
and 'export' declarations are not supported yet.

llvm-svn: 279794

1 files changed, 7 insertions, 15 deletions

diff --git a/clang/lib/Parse/ParseAST.cpp b/clang/lib/Parse/ParseAST.cpp
index bab3dbefb0d..d018d4c08ed 100644
--- a/clang/lib/Parse/ParseAST.cpp
+++ b/clang/lib/Parse/ParseAST.cpp
@@ -138,26 +138,18 @@ void clang::ParseAST(Sema &S, bool PrintStats, bool SkipFunctionBodies) {
   S.getPreprocessor().EnterMainSourceFile();
   P.Initialize();
 
-  // C11 6.9p1 says translation units must have at least one top-level
-  // declaration. C++ doesn't have this restriction. We also don't want to
-  // complain if we have a precompiled header, although technically if the PCH
-  // is empty we should still emit the (pedantic) diagnostic.
   Parser::DeclGroupPtrTy ADecl;
   ExternalASTSource *External = S.getASTContext().getExternalSource();
   if (External)
     External->StartTranslationUnit(Consumer);
 
-  if (P.ParseFirstTopLevelDecl(ADecl)) {
-    if (!External && !S.getLangOpts().CPlusPlus)
-      P.Diag(diag::ext_empty_translation_unit);
-  } else {
-    do {
-      // If we got a null return and something *was* parsed, ignore it.  This
-      // is due to a top-level semicolon, an action override, or a parse error
-      // skipping something.
-      if (ADecl && !Consumer->HandleTopLevelDecl(ADecl.get()))
-        return;
-    } while (!P.ParseTopLevelDecl(ADecl));
+  for (bool AtEOF = P.ParseFirstTopLevelDecl(ADecl); !AtEOF;
+       AtEOF = P.ParseTopLevelDecl(ADecl)) {
+    // If we got a null return and something *was* parsed, ignore it.  This
+    // is due to a top-level semicolon, an action override, or a parse error
+    // skipping something.
+    if (ADecl && !Consumer->HandleTopLevelDecl(ADecl.get()))
+      return;
   }
 
   // Process any TopLevelDecls generated by #pragma weak.