Don't emit a warning about a dllimport attribute being used in a typedef

when -fms-extensions is specified.  Fixes <rdar://problem/7653870>.

llvm-svn: 96722

clang/lib/Sema/TargetAttributesSema.cpp

@@ -115,8 +115,12 @@ static void HandleDLLImportAttr(Decl *D, const AttributeList &Attr, Sema &S) {
 
   FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
   if (!FD) {
-    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
-      << Attr.getName() << 2 /*variable and function*/;
+    // Apparently Visual C++ thinks it is okay to not emit a warning
+    // in this case, so only emit a warning when -fms-extensions is not
+    // specified.
+    if (!S.getLangOptions().Microsoft)
+      S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
+        << Attr.getName() << 2 /*variable and function*/;
     return;
   }
 

clang/test/Rewriter/dllimport-typedef.c

@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -triple i686-pc-win32 -fms-extensions -fsyntax-only %s 2>&1 | FileCheck -check-prefix=CHECK-NEG %s
+// RUN: %clang_cc1 -triple i686-pc-win32 -fsyntax-only %s 2>&1 | FileCheck -check-prefix=CHECK-POS %s
+
+// Do not report an error with including dllimport in the typedef when -fms-extensions is specified.
+// Addresses <rdar://problem/7653870>.
+typedef __declspec(dllimport) int CB(void);
+
+// This function is added just to trigger a diagnostic.  This way we can test how many
+// diagnostics we expect.
+void bar() { return 1; }
+
+// CHECK-NEG: warning: void function 'bar' should not return a value
+// CHECK-NEG: 1 diagnostic generated
+// CHECK-POS: warning: 'dllimport' attribute only applies to variable and function type
+// CHECK-POS: warning: void function 'bar' should not return a value
+// CHECK-POS: 2 diagnostics generated
+