Turned on support for __declspecs: noreturn, noinline, nothrow and naked in MS compatibility mode.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151295 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaDeclAttr.cpp

@@ -3463,10 +3463,19 @@ static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D,
 }
 
 static bool isKnownDeclSpecAttr(const AttributeList &Attr) {
-  return Attr.getKind() == AttributeList::AT_dllimport ||
-         Attr.getKind() == AttributeList::AT_dllexport ||
-         Attr.getKind() == AttributeList::AT_uuid ||
-         Attr.getKind() == AttributeList::AT_deprecated;
+  switch (Attr.getKind()) {
+  default:
+    return false;
+  case AttributeList::AT_dllimport:
+  case AttributeList::AT_dllexport:
+  case AttributeList::AT_uuid:
+  case AttributeList::AT_deprecated:
+  case AttributeList::AT_noreturn:
+  case AttributeList::AT_nothrow:
+  case AttributeList::AT_naked:
+  case AttributeList::AT_noinline:
+    return true;
+  }
 }
 
 //===----------------------------------------------------------------------===//

test/CodeGen/ms-declspecs.c

@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -triple i386-pc-win32 %s -emit-llvm -fms-compatibility -o - | FileCheck %s
+
+// CHECK: define void @t3() nounwind noinline naked {
+__declspec(naked) void t3() {}
+
+// CHECK: define void @t22() nounwind
+void __declspec(nothrow) t22();
+void t22() {}
+
+// CHECK: define void @t2() nounwind noinline {
+__declspec(noinline) void t2() {}
+
+// CHECK: call void @f20_t()
+// CHECK: noreturn
+__declspec(noreturn) void f20_t(void);
+void f20(void) { f20_t(); }

test/Sema/MicrosoftCompatibility.c

@@ -10,3 +10,7 @@ enum ENUM2 {
   ENUM2_b = 0x9FFFFFFF, // expected-warning {{enumerator value is not representable in the underlying type 'int'}}
   ENUM2_c = 0x100000000 // expected-warning {{enumerator value is not representable in the underlying type 'int'}}
 };
+
+__declspec(noreturn) void f6( void ) {
+	return;  // expected-warning {{function 'f6' declared 'noreturn' should not return}}
+}