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x: Specifies the value to be computed.
LOG2(3) Linux Programmer's Manual LOG2(3) NAME log2, log2f, log2l - base-2 logarithmic function SYNOPSIS #include <math.h> double log2(double ...
Solaris 10 Reference Manual Collection >> man pages section 3: Extended Library Functions >> Extended Library Functions >> log2l(3M) – compute base 2 logarithm functions
Read /usr/include/bits/mathcalls.h. Have you compiled a sample code with log2l() and <math.h> and checked whether a warning was displayed? I doubt it.
EDOM: The argument x is negative. ERANGE: The argument x is zero. The log of zero is not defined (minus infinity).
Bug#244610: marked as done (libc6-dev: No header file declares log2l().)
6.497 log2l. POSIX specification: http://www.opengroup.org/susv3xsh/log2l.html. Gnulib module: — Portability problems fixed by Gnulib: Portability problems not fixed by ...
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