Increased RAM usage after upgrade to newlib 4.3.0

[Sebastian Huber]

Hello Pavel,

if you would like to reduce the memory footprint, then you can try out piclolibc as mentioned. You can also try using thread-local storage for the libc thread-specific data through the _REENT_THREAD_LOCAL option. Another option is to change the struct reent initialization for the _REENT_SMALL initialization to dynamically check if the stdio file streams are NULL before they are used. If they are NULL, then they are initialized to use the global __sf[] objects.

Kind regards,
Sebastian

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