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10.1117 strdup

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

Gnulib module: strdup or strdup-posix

Portability problems fixed by either Gnulib module strdup or strdup-posix:

• This function has no prototype in <string.h> on some old platforms.

Portability problems fixed by Gnulib module strdup-posix:

• Upon failure, the function does not set errno to ENOMEM on some platforms: mingw, MSVC 14.

Portability problems not fixed by Gnulib: