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// RUN: %clang_cc1 %s -emit-pch -o %t1.pch -verify
// RUN: %clang_cc1 %s -emit-pch -o %t2.pch -include-pch %t1.pch -verify
// RUN: %clang_cc1 -fsyntax-only %s -include-pch %t2.pch -verify
// Test that a redefinition inside the PCH won't manifest as an ambiguous macro.
// rdar://13016031
#ifndef HEADER1
#define HEADER1
#define M1 0 // expected-note {{previous}}
#define M1 1 // expected-warning {{redefined}}
#define M2 3
#elif !defined(HEADER2)
#define HEADER2
#define M2 4 // expected-warning {{redefined}}
// expected-note@-6 {{previous}}
#else
// Use the error to verify it was parsed.
int x = M1; // expected-note {{previous}}
int x = M2; // expected-error {{redefinition}}
#endif
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