Re: [PATCH] Detect endianness on more platforms that don't use BYTE_ORDER
From: Junio C Hamano <hidden>
Date: 2016-06-15 23:00:58
Charles Bailey [off-list ref] writes:
---
Please sign-off your patches ;-) This swaps the precedence of BYTE_ORDER and __BYTE_ORDER from the original, which we may not want to. It is easy for me to swap the order of if/elif to restore it, so it is not a big deal, though. Thanks.
quoted hunk
compat/bswap.h | 33 ++++++++++++++++++++++++--------- 1 file changed, 24 insertions(+), 9 deletions(-)diff --git a/compat/bswap.h b/compat/bswap.h index 120c6c1..f08a9fe 100644 --- a/compat/bswap.h +++ b/compat/bswap.h@@ -101,19 +101,34 @@ static inline uint64_t git_bswap64(uint64_t x) #undef ntohll #undef htonll -#if !defined(__BYTE_ORDER) -# if defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN) -# define __BYTE_ORDER BYTE_ORDER -# define __LITTLE_ENDIAN LITTLE_ENDIAN -# define __BIG_ENDIAN BIG_ENDIAN +#if defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN) + +# define GIT_BYTE_ORDER BYTE_ORDER +# define GIT_LITTLE_ENDIAN LITTLE_ENDIAN +# define GIT_BIG_ENDIAN BIG_ENDIAN + +#elif defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN) + +# define GIT_BYTE_ORDER __BYTE_ORDER +# define GIT_LITTLE_ENDIAN __LITTLE_ENDIAN +# define GIT_BIG_ENDIAN __BIG_ENDIAN + +#else + +# define GIT_BIG_ENDIAN 4321 +# define GIT_LITTLE_ENDIAN 1234 + +# if defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) +# define GIT_BYTE_ORDER GIT_BIG_ENDIAN +# elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) +# define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN +# else +# error "Cannot determine endianness" # endif -#endif -#if !defined(__BYTE_ORDER) -# error "Cannot determine endianness" #endif -#if __BYTE_ORDER == __BIG_ENDIAN +#if GIT_BYTE_ORDER == GIT_BIG_ENDIAN # define ntohll(n) (n) # define htonll(n) (n) #else