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17 lines
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/*
* Preprocessor compare with right part undefined.
*/
#include <stdio.h>
#define FOO 123
#undef BAR
int main(int argc, char *argv[]) {
#if defined(FOO) && defined(BAR) && (FOO == BAR)
printf("FOO == BAR\n");
#else
printf("FOO != BAR\n");
#endif
return 0;
}