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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* This file contains compiler specific workarounds to handle different
* compilers and different compiler versions.
* Inspired by Linux's include/linux/compiler_attributes.h
* and file sys/cdefs.h in libc and newlib.
*/
#ifndef OPENOCD_HELPER_COMPILER_H
#define OPENOCD_HELPER_COMPILER_H
/*
* __has_attribute is supported on gcc >= 5, clang >= 2.9 and icc >= 17.
*/
#ifndef __has_attribute
# define __has_attribute(x) 0
#endif
/*
* The __returns_nonnull function attribute marks the return type of the function
* as always being non-null.
*/
#ifndef __returns_nonnull
# if __has_attribute(__returns_nonnull__)
# define __returns_nonnull __attribute__((__returns_nonnull__))
# else
# define __returns_nonnull
# endif
#endif
/*
* The __nonnull function attribute marks pointer parameters that
* must not be NULL.
*
* clang for Apple defines
* #define __nonnull _Nonnull
* that is a per argument attribute, incompatible with the gcc per function attribute __nonnull__.
* gcc for Apple includes sys/cdefs.h from MacOSX.sdk that defines
* #define __nonnull
* In both cases, undefine __nonnull to keep compatibility among compilers and platforms.
*/
#if defined(__APPLE__)
# undef __nonnull
#endif
#ifndef __nonnull
# if __has_attribute(__nonnull__)
# define __nonnull(params) __attribute__ ((__nonnull__ params))
# else
# define __nonnull(params)
# endif
#endif
#endif /* OPENOCD_HELPER_COMPILER_H */
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