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13.31.16 isnanl

Documentation:

• https://www.gnu.org/software/libc/manual/html_node/Floating-Point-Classes.html,
• man isnanl.

Gnulib module: isnanl

Portability problems fixed by Gnulib:

• This function is missing on some platforms: macOS 14, FreeBSD 14.0, NetBSD 10.0, OpenBSD 6.7, Minix 3.1.8, AIX 5.1, HP-UX 11, Cygwin 1.7.x, MSVC 14, Android 4.4.
• This function is not declared on some platforms: Android 9.0.

Portability problems not fixed by Gnulib: