A.2. libm

The behavior of the interfaces in this library is specified by the following Standards.

ISO C (1999) [ISOC99]
ISO/IEC 23360 Part 1 [LSB]
ISO POSIX (2003) [SUSv3]

Table A-2. libm Function Interfaces

__fpclassifyl[LSB]__signbitl[ISOC99]exp2l[SUSv3]