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10.1259 va_copy

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

Gnulib module: stdarg

Portability problems fixed by Gnulib:

• This macro is missing on some platforms: AIX 5.1 with cc or xlc, HP-UX 11 with cc.

Portability problems not fixed by Gnulib: