[PATCH 3/3] 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@xxxxxxxxx>
---
 compat/bswap.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compat/bswap.h b/compat/bswap.h
index f6fd9a6..7fed637 100644
--- a/compat/bswap.h
+++ b/compat/bswap.h
@@ -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
-- 
1.9.3

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