1 // RUN: %clang_cc1 %s -emit-pch -o %t1.pch -verify
2 // RUN: %clang_cc1 %s -emit-pch -o %t2.pch -include-pch %t1.pch -verify
3 // RUN: %clang_cc1 -fsyntax-only %s -include-pch %t2.pch -verify
4 
5 // Test that a redefinition inside the PCH won't manifest as an ambiguous macro.
6 // rdar://13016031
7 
8 #ifndef HEADER1
9 #define HEADER1
10 
11 #define M1 0 // expected-note {{previous}}
12 #define M1 1 // expected-warning {{redefined}}
13 
14 #define M2 3
15 
16 #elif !defined(HEADER2)
17 #define HEADER2
18 
19 #define M2 4 // expected-warning {{redefined}}
20  // expected-note@-6 {{previous}}
21 
22 #else
23 
24 // Use the error to verify it was parsed.
25 int x = M1; // expected-note {{previous}}
26 int x = M2; // expected-error {{redefinition}}
27 
28 #endif
29