10.24.208 log2 ¶
POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/log2.html
Gnulib module: log2 or log2-ieee
Portability problems fixed by either Gnulib module log2 or log2-ieee:
- This function is missing on some platforms:
FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, Solaris 9, MSVC 9, Android 4.2.
- This function is only provided as a macro on some platforms:
Cygwin 1.5.x.
- This function returns slightly wrong values for exact powers of 2 on some platforms:
Cygwin 1.7.9.
Portability problems fixed by Gnulib module log2-ieee:
- This function returns a wrong value for a negative argument on some platforms:
NetBSD 5.1, Solaris 10/x86_64.
Portability problems not fixed by Gnulib: