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| author | Damien George <damien.p.george@gmail.com> | 2014-10-06 13:44:59 +0000 |
|---|---|---|
| committer | Damien George <damien.p.george@gmail.com> | 2014-10-06 13:44:59 +0000 |
| commit | a9bcd51dc7f05be0961f699f39d1856e78eaaaa6 (patch) | |
| tree | b2b106bcd916d9b1d731405c75f57ee17e4d54f5 | |
| parent | 5a04e2cca8255c2d4a1218d6ac0b38e67306206b (diff) | |
| download | micropython-a9bcd51dc7f05be0961f699f39d1856e78eaaaa6.tar.gz micropython-a9bcd51dc7f05be0961f699f39d1856e78eaaaa6.zip | |
py: Try to autodetect machine endianness when not defined by port.
| -rw-r--r-- | py/mpconfig.h | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/py/mpconfig.h b/py/mpconfig.h index cf85533395..6056e20436 100644 --- a/py/mpconfig.h +++ b/py/mpconfig.h @@ -434,13 +434,26 @@ typedef double mp_float_t; // mp_int_t value with most significant bit set #define WORD_MSBIT_HIGH (((mp_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 -// Ensure we don't accidentally set both endiannesses -#if MP_ENDIANNESS_BIG -#define MP_ENDIANNESS_LITTLE (0) +// Make sure both MP_ENDIANNESS_LITTLE and MP_ENDIANNESS_BIG are +// defined and that they are the opposite of each other. +#if defined(MP_ENDIANNESS_LITTLE) +#define MP_ENDIANNESS_BIG (!MP_ENDIANNESS_LITTLE) +#elif defined(MP_ENDIANNESS_BIG) +#define MP_ENDIANNESS_LITTLE (!MP_ENDIANNESS_BIG) +#else + // Endiannes not defined by port so try to autodetect it. + #if defined(__BYTE_ORDER__) + #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ + #define MP_ENDIANNESS_LITTLE (1) + #else + #define MP_ENDIANNESS_LITTLE (0) + #endif + #elif defined(__BIG_ENDIAN__) || defined(__BIG_ENDIAN) || defined (_BIG_ENDIAN) + #define MP_ENDIANNESS_LITTLE (0) + #else + #error endianness not defined and cannot detect it + #endif + #define MP_ENDIANNESS_BIG (!MP_ENDIANNESS_LITTLE) #endif // Make a pointer to RAM callable (eg set lower bit for Thumb code) |