_REENT_CHECK_VERIFY calls __assert_func even if NDEBUG is defined

[Keith Packard]

"R. Diez via Newlib" <newlib@sourceware.org> writes:

> Note that sizeof( struct _reent  ) increases from 240 bytes to 1064
> bytes (tested with Newlib version 3.3.0).

If you're tight on RAM, you might look at the newlib fork, picolibc,
which uses native TLS support for reentrant data values like
_rand_next. With that approach, your thread-local storage contains only
values used by your application and malloc need never be called. In this
case, the per-thread data would be only eight bytes.

-- 
-keith
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