macro-redef.c revision 7f69b1ab4f63ded511dddd7fb7e1cd8860757016 
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.
25int x = M1; // expected-note {{previous}}
26int x = M2; // expected-error {{redefinition}}
27
28#endif
29