__builtin_mul_overflow_p 137 lib/intprops-internal.h # define _GL_HAS_BUILTIN_OVERFLOW_P __has_builtin (__builtin_mul_overflow_p) __builtin_mul_overflow_p 183 lib/intprops.h __builtin_mul_overflow_p (a, b, (__typeof__ ((a) * (b))) 0)