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Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
signbit() is a generic macro which can work on all real floating-point
types. It returns a nonzero value if the value of x has its sign bit
This is not the same as x < 0.0, because IEEE 754 floating point allows
zero to be signed. The comparison -0.0 < 0.0 is false, but sign-
bit(-0.0) will return a nonzero value.
NaNs and infinities have a sign bit.
The signbit() macro returns nonzero if the sign of x is negative; oth-
erwise it returns zero.
No errors occur.
Multithreading (see pthreads(7))
The signbit() macro is thread-safe.
C99, POSIX.1-2001. This function is defined in IEC 559 (and the
appendix with recommended functions in IEEE 754/IEEE 854).
GNU 2013-07-04 SIGNBIT(3)