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10.240 expm1

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/expm1.html

Gnulib module: expm1 or expm1-ieee

Portability problems fixed by either Gnulib module expm1 or expm1-ieee:

• This function is missing on some platforms: Minix 3.1.8, mingw, MSVC 9.

Portability problems fixed by Gnulib module expm1-ieee:

• This function has problems when the argument is minus zero on some platforms: AIX 7.1.

Portability problems not fixed by Gnulib: