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compat/bswap.h: detect endianness from XL C compiler macros

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There is no /usr/include/endian.h equivalent on z/OS, but the
compiler will define macros to indicate endianness on host and
target hardware.  This adds a test for these macros as a last
resort for determining byte order.

Signed-off-by: David Michael <fedora.dm0@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
David Michael 2014-10-26 13:34:26 -04:00 committed by Junio C Hamano
parent 48a031af3c
commit bfb0e6fcd2
1 changed files with 4 additions and 0 deletions
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4
compat/bswap.h
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@ -122,6 +122,10 @@ static inline uint64_t git_bswap64(uint64_t x)
# define GIT_BYTE_ORDER GIT_BIG_ENDIAN
# elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)
# define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN
# elif defined(__THW_BIG_ENDIAN__) && !defined(__THW_LITTLE_ENDIAN__)
# define GIT_BYTE_ORDER GIT_BIG_ENDIAN
# elif defined(__THW_LITTLE_ENDIAN__) && !defined(__THW_BIG_ENDIAN__)
# define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN
# else
# error "Cannot determine endianness"
# endif