assert ¶POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/assert.html
Gnulib module: —
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
Extension: Gnulib offers a module ‘assert’ that allows the installer to disable assertions through a ‘configure’ option: ‘--disable-assert’.