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10.103 ceil

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

Gnulib module: ceil or ceil-ieee

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

Portability problems fixed by Gnulib module ceil-ieee:

• This function returns a positive zero for an argument between -1 and 0 on some platforms: AIX 7.1.

Portability problems not fixed by Gnulib: