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pfalconpfalcon
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windows: mingw32 gcc doesn't define endianness macros, so just assume little.
Specifically, at least Ubuntu's i586-mingw32msvc-gcc doesn't supply __LITTLE_ENDIAN__ and friends. And as it's safe enough to assume that Windows is only little-endian, then it's defined unconditionally, instead of duplicating detection logic in py/mpconfig.h (or adding windows-specific defines to it).
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‎windows/mpconfigport.h‎

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@@ -88,6 +88,10 @@ typedef unsigned int mp_uint_t; // must be pointer size
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#define BYTES_PER_WORD sizeof(mp_int_t)
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// Just assume Windows is little-endian - mingw32 gcc doesn't
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// define standard endianness macros.
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#define MP_ENDIANNESS_LITTLE (1)
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typedef void *machine_ptr_t; // must be of pointer size
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typedef const void *machine_const_ptr_t; // must be of pointer size
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