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#define USE(MY_USE) (defined MY_USE_##MY_USE && MY_USE_##MY_USE)
#define MY_USE_FEATURE1 1
#define MY_USE_FEATURE2 0
#if USE(FEATURE1)
void thisFunctionIsEnabled();
#endif
#if USE(FEATURE2)
void thisFunctionIsDisabled();
#endif
#if USE(FEATURE3)
void thisFunctionIsAlsoDisabled();
#endif
#define USE2(MY_USE) (defined MY_USE_##MY_USE)
#if USE2(FEATURE1)
void thisFunctionIsEnabled2();
#endif
#if USE2(FEATURE3)
void thisFunctionIsDisabled2();
#endif
#define USE3(MY_USE) (MY_USE_##MY_USE)
#if USE3(FEATURE1)
void thisFunctionIsEnabled3();
#endif
#if USE3(FEATURE2)
void thisFunctionIsDisabled3();
#endif
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