[RFA] enable dynamic (thread safe) reents

[Thomas Pfaff]

Thomas Pfaff wrote:

> While single threaded apps should keep run without problems (_impure_ptr
> is still used for the mainthread) multithreaded apps should be recompiled
> to get the full power of the thread safe reents. This is due the
> fact that _RRENT is used in some newlib headers directly. Unfortunately
> this affects also static libs, therefore this is will be a longer
> transition.
> 

TTTT,

this will only affect stdio

stdio.h:147:#define     stdin   (_REENT->_stdin)
stdio.h:148:#define     stdout  (_REENT->_stdout)
stdio.h:149:#define     stderr  (_REENT->_stderr)

and i consider this harmless.

Thomas