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Detects processor endianess using preprocessor

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This allow to define macros based on endianess in public headers

Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
This commit is contained in:
Frediano Ziglio 2015-08-12 11:42:45 +01:00 committed by Christophe Fergeau
parent 03a28f5856
commit 3ab16f2dad
1 changed files with 55 additions and 0 deletions
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55
spice/macros.h
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@ -359,4 +359,59 @@
#endif /* generic */
/* detect endianess */
#undef SPICE_ENDIAN
#define SPICE_ENDIAN_LITTLE 4321
#define SPICE_ENDIAN_BIG 1234
#define SPICE_ENDIAN_PDP 2143
/* gcc already defined these, use them */
#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) \
&& defined(__ORDER_BIG_ENDIAN__) && defined(__ORDER_PDP_ENDIAN__)
# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define SPICE_ENDIAN SPICE_ENDIAN_LITTLE
# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define SPICE_ENDIAN SPICE_ENDIAN_BIG
# elif __BYTE_ORDER__ == __ORDER_PDP_ENDIAN__
# define SPICE_ENDIAN SPICE_ENDIAN_PDP
# else
# error __BYTE_ORDER__ not defined correctly
# endif
#endif
/* use suggestions at http://sourceforge.net/p/predef/wiki/Endianness/ */
#ifndef SPICE_ENDIAN
# if defined(__LITTLE_ENDIAN__) || defined(__ARMEL__) \
|| defined(__THUMBEL__) || defined(__AARCH64EL__) \
|| defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__)
# define SPICE_ENDIAN SPICE_ENDIAN_LITTLE
# endif
# if defined(__BIG_ENDIAN__) || defined(__ARMEB__) \
|| defined(__THUMBEB__) || defined(__AARCH64EB__) \
|| defined(_MIPSEB) || defined(__MIPSEB) || defined(__MIPSEB__)
# ifdef SPICE_ENDIAN
# error Both little and big endian detected
# endif
# define SPICE_ENDIAN SPICE_ENDIAN_BIG
# endif
#endif
/* MS compiler */
#if !defined(SPICE_ENDIAN) && defined(_MSC_VER)
/* Windows support only little endian arm */
# if defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) \
|| defined(_M_ARM)
# define SPICE_ENDIAN SPICE_ENDIAN_LITTLE
# endif
#endif
#if !defined(SPICE_ENDIAN)
#error Unable to detect processor endianess
#endif
#if SPICE_ENDIAN == SPICE_ENDIAN_PDP
#error PDP endianess not supported by Spice
#endif
#endif /* _H_SPICE_MACROS */