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https://github.com/zephyrproject-rtos/zephyr
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Compilers based on Clang provide a __has_builtin(x) macro which can be used to detect in the preprocessor if a given builtin function is supported by the compiler. For other compilers (notably GCC), we provide an alternative definition of HAS_BUILTIN(x) that depends on the toolchain-specific header file to declare which builtin functions are supported based on the current compiler version. Signed-off-by: Jakob Olesen <jolesen@fb.com>
45 lines
1.1 KiB
C
45 lines
1.1 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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#include <toolchain/other.h>
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#endif
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#endif /* ZEPHYR_INCLUDE_TOOLCHAIN_H_ */
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