HelenOS sources

signbit           102 uspace/lib/c/include/math.h #define signbit(x)     __builtin_signbit(x)
signbit           124 uspace/lib/c/include/math.h #define signbit(x)     __signbit(sizeof(x), (x))
signbit           102 uspace/lib/posix/include/libc/math.h #define signbit(x)     __builtin_signbit(x)
signbit           124 uspace/lib/posix/include/libc/math.h #define signbit(x)     __signbit(sizeof(x), (x))