llvm-project/clang/test/PCH/multiple-include-pch.c

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// RUN: %clang_cc1 -emit-pch -o %t1.pch %s
// RUN: %clang_cc1 -emit-pch -o %t2.pch %s
// RUN: %clang_cc1 %s -include-pch %t1.pch -include-pch %t2.pch -verify
#ifndef HEADER
#define HEADER
extern int x;
#else
#warning parsed this
// expected-warning@-1 {{parsed this}}
int foo() {
return x;
}
#endif