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10.21 acosl

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/acosl.html

Gnulib module: acosl

Portability problems fixed by Gnulib:

• This function is missing on some platforms: FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, HP-UX 11, Solaris 9, Cygwin 1.7.x, Android 4.4.
• This function is only defined as a macro with arguments on some platforms: MSVC 14.

Portability problems not fixed by Gnulib:

• This function produces results which are accurate to only 16 digits on some platforms: NetBSD 10.0.