forked from OSchip/llvm-project
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
//===-- int_endianness.h - configuration header for compiler-rt -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a configuration header for compiler-rt.
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// This file is not part of the interface of this library.
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//
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//===----------------------------------------------------------------------===//
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#ifndef INT_ENDIANNESS_H
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#define INT_ENDIANNESS_H
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#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
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defined(__ORDER_LITTLE_ENDIAN__)
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// Clang and GCC provide built-in endianness definitions.
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif // __BYTE_ORDER__
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#else // Compilers other than Clang or GCC.
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#if defined(__SVR4) && defined(__sun)
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#include <sys/byteorder.h>
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#if defined(_BIG_ENDIAN)
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#elif defined(_LITTLE_ENDIAN)
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#else // !_LITTLE_ENDIAN
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#error "unknown endianness"
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#endif // !_LITTLE_ENDIAN
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#endif // Solaris and AuroraUX.
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// ..
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || \
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defined(__minix)
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#include <sys/endian.h>
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#if _BYTE_ORDER == _BIG_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#elif _BYTE_ORDER == _LITTLE_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif // _BYTE_ORDER
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#endif // *BSD
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#if defined(__OpenBSD__)
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#include <machine/endian.h>
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#if _BYTE_ORDER == _BIG_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#elif _BYTE_ORDER == _LITTLE_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif // _BYTE_ORDER
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#endif // OpenBSD
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// ..
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// Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the
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// compiler (at least with GCC)
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#if defined(__APPLE__) || defined(__ellcc__)
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#ifdef __BIG_ENDIAN__
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#if __BIG_ENDIAN__
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#endif
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#endif // __BIG_ENDIAN__
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#ifdef __LITTLE_ENDIAN__
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#if __LITTLE_ENDIAN__
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif
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#endif // __LITTLE_ENDIAN__
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#endif // Mac OSX
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// ..
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#if defined(_WIN32)
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif // Windows
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#endif // Clang or GCC.
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// .
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#if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)
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#error Unable to determine endian
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#endif // Check we found an endianness correctly.
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#endif // INT_ENDIANNESS_H
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