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97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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Copyright 2006, Bernhard Fischer
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Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#ifndef __PLATFORM_H
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#define __PLATFORM_H 1
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/* Convenience macros to test the version of gcc. */
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#undef __GNUC_PREREQ
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#if defined __GNUC__ && defined __GNUC_MINOR__
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# define __GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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#else
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# define __GNUC_PREREQ(maj, min) 0
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#endif
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/* __restrict is known in EGCS 1.2 and above. */
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#if !__GNUC_PREREQ (2,92)
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# ifndef __restrict
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# define __restrict /* Ignore */
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# endif
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#endif
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/* Define macros for some gcc attributes. This permits us to use the
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macros freely, and know that they will come into play for the
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version of gcc in which they are supported. */
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#if !__GNUC_PREREQ (2,7)
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# ifndef __attribute__
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# define __attribute__(x)
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# endif
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#endif
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#if 0
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/* Attribute __malloc__ on functions was valid as of gcc 2.96. */
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#ifndef ATTRIBUTE_MALLOC
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# if __GNUC_PREREQ (2,96)
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# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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# else
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# define ATTRIBUTE_MALLOC
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# endif /* GNUC >= 2.96 */
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#endif /* ATTRIBUTE_MALLOC */
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#endif
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#ifndef ATTRIBUTE_UNUSED
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#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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#endif /* ATTRIBUTE_UNUSED */
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#ifndef ATTRIBUTE_NORETURN
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#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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#endif /* ATTRIBUTE_NORETURN */
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#ifndef ATTRIBUTE_PACKED
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#define ATTRIBUTE_PACKED __attribute__ ((__packed__))
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#endif /* ATTRIBUTE_NORETURN */
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#ifndef ATTRIBUTE_ALIGNED
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#define ATTRIBUTE_ALIGNED(m) __attribute__ ((__aligned__(m)))
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#endif /* ATTRIBUTE_ALIGNED */
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/* -fwhole-program makes all symbols local. The attribute externally_visible
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forces a symbol global. */
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#ifndef ATTRIBUTE_EXTERNALLY_VISIBLE
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# if __GNUC_PREREQ (4,1)
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# define ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((__externally_visible__))
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# else
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# define ATTRIBUTE_EXTERNALLY_VISIBLE
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# endif /* GNUC >= 4.1 */
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#endif /* ATTRIBUTE_EXTERNALLY_VISIBLE */
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/* We use __extension__ in some places to suppress -pedantic warnings
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about GCC extensions. This feature didn't work properly before
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gcc 2.8. */
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#if !__GNUC_PREREQ (2,8)
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# ifndef __extension__
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# define __extension__
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# endif
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#endif
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/* ---- Endian Detection ------------------------------------ */
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#ifndef __APPLE__
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#include <byteswap.h>
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#include <endian.h>
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#endif
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#ifdef __BIG_ENDIAN__
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#define BB_BIG_ENDIAN 1
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#elif __BYTE_ORDER == __BIG_ENDIAN
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#define BB_BIG_ENDIAN 1
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#else
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#define BB_BIG_ENDIAN 0
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#endif
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#endif /* platform.h */
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