[modules] Suport for merging a parsed enum definition into an existing imported but not visible definition.

llvm-svn: 236690

1 files changed, 23 insertions, 1 deletions

diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index 16639f04cea..5ad673aef14 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -3893,6 +3893,13 @@ void Parser::ParseEnumSpecifier(SourceLocation StartLoc, DeclSpec &DS,
 
   handleDeclspecAlignBeforeClassKey(attrs, DS, TUK);
 
+  Sema::SkipBodyInfo SkipBody;
+  if (!Name && TUK == Sema::TUK_Definition && Tok.is(tok::l_brace) &&
+      NextToken().is(tok::identifier))
+    SkipBody = Actions.shouldSkipAnonEnumBody(getCurScope(),
+                                              NextToken().getIdentifierInfo(),
+                                              NextToken().getLocation());
+
   bool Owned = false;
   bool IsDependent = false;
   const char *PrevSpec = nullptr;
@@ -3902,7 +3909,22 @@ void Parser::ParseEnumSpecifier(SourceLocation StartLoc, DeclSpec &DS,
                                    AS, DS.getModulePrivateSpecLoc(), TParams,
                                    Owned, IsDependent, ScopedEnumKWLoc,
                                    IsScopedUsingClassTag, BaseType,
-                                   DSC == DSC_type_specifier);
+                                   DSC == DSC_type_specifier, &SkipBody);
+
+  if (SkipBody.ShouldSkip) {
+    assert(TUK == Sema::TUK_Definition && "can only skip a definition");
+
+    BalancedDelimiterTracker T(*this, tok::l_brace);
+    T.consumeOpen();
+    T.skipToEnd();
+
+    if (DS.SetTypeSpecType(DeclSpec::TST_enum, StartLoc,
+                           NameLoc.isValid() ? NameLoc : StartLoc,
+                           PrevSpec, DiagID, TagDecl, Owned,
+                           Actions.getASTContext().getPrintingPolicy()))
+      Diag(StartLoc, DiagID) << PrevSpec;
+    return;
+  }
 
   if (IsDependent) {
     // This enum has a dependent nested-name-specifier. Handle it as a