From b380ebfb26031336f4d43812c4d9e2dab5f09b08 Mon Sep 17 00:00:00 2001
From: Hin-Tak Leung <htl10@users.sourceforge.net>
Date: Fri, 4 Dec 2020 22:05:28 +0000
Subject: [PATCH] older compiler than gcc 5 does not have __has_attribute

fix for older compiler than gcc 5

Reference: kernel's include/linux/compiler_attributes.h
---
 sound-compatible-4.18.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound-compatible-4.18.h b/sound-compatible-4.18.h
index faed848..eefa7de 100644
--- a/sound-compatible-4.18.h
+++ b/sound-compatible-4.18.h
@@ -16,6 +16,10 @@
 #endif
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(5,4,0)
+#ifndef __has_attribute
+# define __has_attribute(x) __GCC4_has_attribute_##x
+# define __GCC4_has_attribute___fallthrough__         0
+#endif
 #if __has_attribute(__fallthrough__)
 # define fallthrough                    __attribute__((__fallthrough__))
 #else