Index: lib/Sema/SemaType.cpp
===================================================================
--- lib/Sema/SemaType.cpp
+++ lib/Sema/SemaType.cpp
@@ -3500,16 +3500,27 @@
 }
 
 static void fillAttributedTypeLoc(AttributedTypeLoc TL,
-                                  const AttributeList *attrs) {
-  AttributedType::Kind kind = TL.getAttrKind();
-
-  assert(attrs && "no type attributes in the expected location!");
-  AttributeList::Kind parsedKind = getAttrListKind(kind);
-  while (attrs->getKind() != parsedKind) {
+                                  const AttributeList *attrs,
+                                  const AttributeList *DeclAttrs = nullptr) {
+  // DeclAttrs and attrs cannot be both empty.
+  assert((attrs || DeclAttrs) &&
+         "no type attributes in the expected location!");
+
+  AttributeList::Kind parsedKind = getAttrListKind(TL.getAttrKind());
+  // Try to search for an attribute of matching kind in attrs list.
+  while (attrs && attrs->getKind() != parsedKind)
     attrs = attrs->getNext();
-    assert(attrs && "no matching attribute in expected location!");
+  if (!attrs) {
+    // No matching type attribute in attrs list found.
+    // Try searching through C++11 attributes in the declarator attribute list.
+    while (DeclAttrs && (!DeclAttrs->isCXX11Attribute() ||
+                         DeclAttrs->getKind() != parsedKind))
+      DeclAttrs = DeclAttrs->getNext();
+    attrs = DeclAttrs;
   }
 
+  assert(attrs && "no matching type attribute in expected location!");
+
   TL.setAttrNameLoc(attrs->getLoc());
   if (TL.hasAttrExprOperand()) {
     assert(attrs->isArgExpr(0) && "mismatched attribute operand kind");
@@ -3863,6 +3874,7 @@
                                      TypeSourceInfo *ReturnTypeInfo) {
   TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T);
   UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
+  const AttributeList *DeclAttrs = D.getAttributes();
 
   // Handle parameter packs whose type is a pack expansion.
   if (isa<PackExpansionType>(T)) {
@@ -3879,7 +3891,7 @@
     }
 
     while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) {
-      fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs());
+      fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs(), DeclAttrs);
       CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
     }
 
Index: test/SemaCXX/cxx11-gnu-attrs.cpp
===================================================================
--- test/SemaCXX/cxx11-gnu-attrs.cpp
+++ test/SemaCXX/cxx11-gnu-attrs.cpp
@@ -8,6 +8,19 @@
 // expected-error@-1 {{'unused' attribute cannot be applied to types}}
 int *[[gnu::unused]] attr_on_ptr;
 // expected-warning@-1 {{attribute 'unused' ignored, because it cannot be applied to a type}}
+[[gnu::fastcall]] void pr17424_1();
+// expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
+[[gnu::fastcall]] [[gnu::stdcall]] void pr17424_2();
+// expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
+// expected-warning@-2 {{calling convention 'stdcall' ignored for this target}}
+[[gnu::fastcall]] __stdcall void pr17424_3();
+// expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
+// expected-warning@-2 {{calling convention '__stdcall' ignored for this target}}
+[[gnu::fastcall]] void pr17424_4() [[gnu::stdcall]];
+// expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
+// expected-warning@-2 {{attribute 'stdcall' ignored, because it cannot be applied to a type}}
+void pr17424_5 [[gnu::fastcall]]();
+// expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
 
 // Valid cases.