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9.825 putchar

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/putchar.html

Gnulib module: stdio, nonblocking, sigpipe

Portability problems fixed by Gnulib module stdio, together with module nonblocking:

Portability problems fixed by Gnulib module stdio, together with module sigpipe:

Portability problems not fixed by Gnulib: