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bswap.h: add support for __BYTE_ORDER__

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The __BYTE_ORDER__ define is provided by gcc (since ~v4.6), clang
(since ~v3.2) and icc (since ~16.0.3).

The __BYTE_ORDER and BYTE_ORDER macros are libc specific and are not
available on all supported platforms such as mingw.

Add support for the __BYTE_ORDER__ macro as a fallback.

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Sebastian Andrzej Siewior
2025-07-15 21:12:26 +02:00
committed by Junio C Hamano
parent 1944e0717f
commit f1b8524303
1 changed files with 6 additions and 0 deletions
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6
compat/bswap.h
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@@ -116,6 +116,12 @@ static inline uint64_t git_bswap64(uint64_t x)
# define GIT_LITTLE_ENDIAN LITTLE_ENDIAN
# define GIT_BIG_ENDIAN BIG_ENDIAN
#elif defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__)
# define GIT_BYTE_ORDER __BYTE_ORDER__
# define GIT_LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
# define GIT_BIG_ENDIAN __ORDER_BIG_ENDIAN__
#else
# define GIT_BIG_ENDIAN 4321