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gcc
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testsuite
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gcc.dg
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cpp
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warn-unused-macros.c
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// { dg-do preprocess }
// { dg-options "-std=gnu99 -fdiagnostics-show-option -Wunused-macros" }
#define
X X
// { dg-warning "9:macro \"X\" is not used .-Wunused-macros." }