linux-kernel - [PATCH linux-next] tools: compiler-gcc.h::Keep compatible with non-clang compilers.

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Message-Id: <20211231100833.590691-1-xu.xin16@zte.com.cn>
Date:   Fri, 31 Dec 2021 10:08:33 +0000
From:   cgel.zte@...il.com
To:     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 non-clang compilers.

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

When HOSTC = gcc (GCC) 4.8.5, there is an error occurring as follows:
error: Undefined __has_attribute.

This problem is introduced by commit d0ee23f9d78be ("tools:
compiler-gcc.h: Guard error attribute use with __has_attribute").

To solve it, this patch is given to keep the comatibility.

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 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/include/linux/compiler-gcc.h b/tools/include/linux/compiler-gcc.h
index 8816f06fc6c7..7da593d3cb91 100644
--- a/tools/include/linux/compiler-gcc.h
+++ b/tools/include/linux/compiler-gcc.h
@@ -16,6 +16,11 @@
 # define __fallthrough __attribute__ ((fallthrough))
 #endif
 
+
+#ifndef __has_attribute
+# define __has_attribute(x) 0  /* Compatibility with non-clang compilers. */
+#endif
+
 #if __has_attribute(__error__)
 # define __compiletime_error(message) __attribute__((error(message)))
 #endif
-- 
2.25.1