Sema: Definition of dllimport globals is not allowed

Upgrades the warning to an error and clarifies the message by treating the
definition as error instead of the attribute.

llvm-svn: 202300
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 266f668..601c161 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -8123,6 +8123,13 @@
       return;
   }
 
+  // dllimport cannot be used on variable definitions.
+  if (VDecl->hasAttr<DLLImportAttr>() && !VDecl->isStaticDataMember()) {
+    Diag(VDecl->getLocation(), diag::err_attribute_dllimport_data_definition);
+    VDecl->setInvalidDecl();
+    return;
+  }
+
   if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) {
     // C99 6.7.8p5. C++ has no such restriction, but that is a defect.
     Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index d61d63a..2600a4f 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -3793,15 +3793,6 @@
   if (D->hasAttr<DLLImportAttr>())
     return NULL;
 
-  if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
-    if (VD->hasDefinition()) {
-      // dllimport cannot be applied to definitions.
-      Diag(D->getLocation(), diag::warn_attribute_invalid_on_definition)
-        << "dllimport";
-      return NULL;
-    }
-  }
-
   return ::new (Context) DLLImportAttr(Range, Context, AttrSpellingListIndex);
 }