include/wrapper/compiler_attributes.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * wrapper/compiler_attributes.h
   4  *
   5  * Copyright (C) 2021 Michael Jeanson <mjeanson@efficios.com>
   6  */
   7
   8 #ifndef _LTTNG_WRAPPER_COMPILER_ATTRIBUTES_H
   9 #define _LTTNG_WRAPPER_COMPILER_ATTRIBUTES_H
  10
  11 #include <lttng/kernel-version.h>
  12
  13 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,20,0))
  14 #include <linux/compiler_attributes.h>
  15 #endif
  16
  17 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,4,0))
  18
  19 /*
  20  * Use the kernel provided fallthrough attribute macro.
  21  */
  22 #define lttng_fallthrough fallthrough
  23
  24 #else /* LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,4,0) */
  25
  26 /*
  27  * Fallback to the comment for kernels pre 5.15 that don't build with
  28  * '-Wimplicit-fallthrough=5'.
  29  */
  30 #define lttng_fallthrough do {} while (0)  /* fallthrough */
  31
  32 #endif /* LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,4,0) */
  33
  34 #endif /* _LTTNG_WRAPPER_COMPILER_ATTRIBUTES_H */