linux-kernel - [PATCH linux-next] tools: compiler-gcc.h: Keep compatible with older GCC versions

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Message-Id: <20220102120201.594408-1-xu.xin16@zte.com.cn>
Date:   Sun,  2 Jan 2022 12:02:01 +0000
From:   cgel.zte@...il.com
To:     torvalds@...ux-foundation.org, nathan@...nel.org,
        ndesaulniers@...gle.com, keescook@...omium.org
Cc:     wang.yong12@....com.cn, xu.xin16@....com.cn,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH linux-next] tools: compiler-gcc.h: Keep compatible with older GCC versions

From: xu xin <xu.xin16@....com.cn>

When HOST CC = gcc (GCC) 4.8.5, we found that there is an error occurring:
Undefined __has_attribute as we built the whole kernel and tools.

To solve this, this patch is given to keep the compatibility with older
GCC versions.

Reported-by: Zeal Robot <zealci@....com.cn>
Co-developed-by: wangyong <wang.yong12@....com.cn>
Signed-off-by: xu xin <xu.xin16@....com.cn>
---
 tools/include/linux/compiler-gcc.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/include/linux/compiler-gcc.h b/tools/include/linux/compiler-gcc.h
index 8816f06fc6c7..333ed16b3b12 100644
--- a/tools/include/linux/compiler-gcc.h
+++ b/tools/include/linux/compiler-gcc.h
@@ -16,6 +16,10 @@
 # define __fallthrough __attribute__ ((fallthrough))
 #endif
 
+#ifndef __has_attribute
+# define __has_attribute(x) 0  /* Compatibility with GCC versions < 5.x */
+#endif
+
 #if __has_attribute(__error__)
 # define __compiletime_error(message) __attribute__((error(message)))
 #endif
-- 
2.25.1