[patch] open_memstream 16bit portability issue.

[Ralf Corsepius]

Hi,

another issue:

internal_open_memstream_r() in libc/stdio/open_memstream.c presumes 
size_t to accept 64*1024 (0x10000).

This is not applicable on 16-bit targets (sizeof(size_t) == 2). GCC 
warns about this.

The patch works around this issue by disabling the code in question on 
targets whose SIZE_MAX is less than 64*1024.

Ralf


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