Hi,
It looks like the move of certain defines from the command line (-DXXXX) to newlib.h has resulted in postional argument support being disabled even when it is explicitly enabled. The problem is that vprintf.c is expecting that _WANT_IO_POS_ARGS would be defined on the command line, thus it put the #ifdef test before including newlib.h. IMHO, I find the usage of preprocessor conditionals in newlib to be excessive, almost to the point of being gratuitous. I also think that putting conditionals before includes is a bad idea, in general. Be that as it may, I have attached a fix which rectifies the issue at hand. In addition, I removed a redundant include of reent.h. However, it might be a good idea to review the other defines moved from the command line to newlib.h, to be sure that this problem isn't silently manifesting itself elsewhere.
Cheers,
Nicholas
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