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Preprocessor
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warn-macro-unused.c
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// RUN: %clang_cc1 %s -Wunused-macros -Dfoo -Dfoo -verify
#include
"warn-macro-unused.h"
#define
unused
// expected-warning {{macro is not used}}
#define
unused
unused
// rdar://9745065
#undef
unused_from_header
// no warning