1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2 // RUN: %clang_cc1 -DMS -fms-compatibility -Wmicrosoft-inaccessible-base -fsyntax-only -verify %s
3 
4 struct A {
5   int a;
6 };
7 
8 struct X1 : virtual A
9 {};
10 
11 struct Y1 : X1, virtual A
12 {};
13 
14 struct Y2 : X1, A // expected-warning{{direct base 'A' is inaccessible due to ambiguity:\n    struct Y2 -> X1 -> A\n    struct Y2 -> A}}
15 {};
16 
17 struct X2 : A
18 {};
19 
20 struct Z1 : X2, virtual A // expected-warning{{direct base 'A' is inaccessible due to ambiguity:\n    struct Z1 -> X2 -> A\n    struct Z1 -> A}}
21 {};
22 
23 struct Z2 : X2, A // expected-warning{{direct base 'A' is inaccessible due to ambiguity:\n    struct Z2 -> X2 -> A\n    struct Z2 -> A}}
24 {};
25 
26 A *y2_to_a(Y2 *p) {
27 #ifdef MS
28   // expected-warning@+4 {{accessing inaccessible direct base 'A' of 'Y2' is a Microsoft extension}}
29 #else
30   // expected-error@+2 {{ambiguous conversion}}
31 #endif
32   return p;
33 }
34 
35 A *z1_to_a(Z1 *p) {
36 #ifdef MS
37   // expected-warning@+4 {{accessing inaccessible direct base 'A' of 'Z1' is a Microsoft extension}}
38 #else
39   // expected-error@+2 {{ambiguous conversion}}
40 #endif
41   return p;
42 }
43 
44 A *z1_to_a(Z2 *p) {
45 #ifdef MS
46   // expected-warning@+4 {{accessing inaccessible direct base 'A' of 'Z2' is a Microsoft extension}}
47 #else
48   // expected-error@+2 {{ambiguous conversion}}
49 #endif
50   return p;
51 }
52