ba9b8dd183
Revert 1b5e6072ca which
broke things for off-tree toolchains,
and add a note about the reason for that line so it is not
removed again.
That include line is, logically, not there for the compilers which
are supported in the tree, but for other compilers which would
be supported thru off-tree headers and cmake files.
Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* Copyright (c) 2010-2014, Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Macros to abstract toolchain specific capabilities
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*
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* This file contains various macros to abstract compiler capabilities that
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* utilize toolchain specific attributes and/or pragmas.
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*/
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#ifndef ZEPHYR_INCLUDE_TOOLCHAIN_H_
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#define ZEPHYR_INCLUDE_TOOLCHAIN_H_
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/**
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* @def HAS_BUILTIN(x)
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* @brief Check if the compiler supports the built-in function \a x.
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*
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* This macro is for use with conditional compilation to enable code using a
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* builtin function that may not be available in every compiler.
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*/
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#ifdef __has_builtin
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#define HAS_BUILTIN(x) __has_builtin(x)
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#else
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/*
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* The compiler doesn't provide the __has_builtin() macro, so instead we depend
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* on the toolchain-specific headers to define HAS_BUILTIN_x for the builtins
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* supported.
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*/
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#define HAS_BUILTIN(x) HAS_BUILTIN_##x
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#endif
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#if defined(__XCC__)
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#include <toolchain/xcc.h>
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#elif defined(__GNUC__) || (defined(_LINKER) && defined(__GCC_LINKER_CMD__))
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#include <toolchain/gcc.h>
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#else
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/* This include line exists for off-tree definitions of compilers,
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* and therefore this header is not meant to exist in-tree
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*/
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#include <toolchain/other.h>
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#endif
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/*
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* Ensure that __BYTE_ORDER__ and related preprocessor definitions are defined,
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* as these are often used without checking for definition and doing so can
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* cause unexpected behaviours.
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*/
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#ifndef _LINKER
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#if !defined(__BYTE_ORDER__) || !defined(__ORDER_BIG_ENDIAN__) || \
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!defined(__ORDER_LITTLE_ENDIAN__)
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#error "__BYTE_ORDER__ is not defined"
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#endif
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#endif /* !_LINKER */
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#endif /* ZEPHYR_INCLUDE_TOOLCHAIN_H_ */
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