mpconfig.h: Add basic support for target endianness configuration.
A specific target can define either MP_ENDIANNESS_LITTLE or MP_ENDIANNESS_BIG
to 1. Default is MP_ENDIANNESS_LITTLE.
TODO: Autodetect based on compiler predefined macros?
diff --git a/py/mpconfig.h b/py/mpconfig.h
index b120c4b..2c118b4 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -169,6 +169,11 @@
// machine_int_t value with most significant bit set
#define WORD_MSBIT_HIGH (((machine_uint_t)1) << (BYTES_PER_WORD * 8 - 1))
+#if !defined(MP_ENDIANNESS_LITTLE) && !defined(MP_ENDIANNESS_BIG)
+// Just because most archs are such?
+#define MP_ENDIANNESS_LITTLE (1)
+#endif
+
// printf format spec to use for machine_int_t and friends
#ifndef INT_FMT
#ifdef __LP64__