debug.h

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#include <stdio.h>

#ifdef DEBUG
#  define PRINT_DEBUG(fmt, ...) \
    fprintf(stderr, "DEBUG: %s(), %s:%d: " fmt,         \
        __func__, __FILE__, __LINE__, ##__VA_ARGS__)
#  define IFDEBUG(x) x
#else
// Does nothing
#  define PRINT_DEBUG(fmt, ...)
// Does nothing
#  define IFDEBUG(x)
#endif