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Use compiler provided endianness definitions if available. 

This makes int_endianness.h work on operating systems for which we
haven't written explicit constructs, as long as GCC or Clang are being
used.

llvm-svn: 230208
This commit is contained in:
Ed Schouten 2015-02-23 09:27:49 +00:00
parent 4992099b42
commit f6d492e683
1 changed files with 16 additions and 12 deletions
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28
compiler-rt/lib/builtins/int_endianness.h
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@ -16,6 +16,20 @@
#ifndef INT_ENDIANNESS_H
#define INT_ENDIANNESS_H
#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
defined(__ORDER_LITTLE_ENDIAN__)
/* Clang and GCC provide built-in endianness definitions. */
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define _YUGA_LITTLE_ENDIAN 0
#define _YUGA_BIG_ENDIAN 1
#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define _YUGA_LITTLE_ENDIAN 1
#define _YUGA_BIG_ENDIAN 0
#endif /* __BYTE_ORDER__ */
#else /* Compilers other than Clang or GCC. */
#if defined(__SVR4) && defined(__sun)
#include <sys/byteorder.h>
@ -84,18 +98,6 @@
/* .. */
#if defined(__linux__)
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define _YUGA_LITTLE_ENDIAN 0
#define _YUGA_BIG_ENDIAN 1
#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define _YUGA_LITTLE_ENDIAN 1
#define _YUGA_BIG_ENDIAN 0
#endif /* __BYTE_ORDER__ */
#endif /* GNU/Linux */
#if defined(_WIN32)
#define _YUGA_LITTLE_ENDIAN 1
@ -103,6 +105,8 @@
#endif /* Windows */
#endif /* Clang or GCC. */
/* . */
#if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)