linux-kernel - [PATCH] compiler-gcc.h: don't set COMPILER_HAS_GENERIC_BUILTIN

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Message-Id: <20180608063441.8562-1-mbenes@suse.cz>
Date:   Fri,  8 Jun 2018 08:34:41 +0200
From:   Miroslav Benes <mbenes@...e.cz>
To:     keescook@...omium.org
Cc:     linux@...musvillemoes.dk, luc.vanoostenryck@...il.com,
        linux-kernel@...r.kernel.org, Miroslav Benes <mbenes@...e.cz>
Subject: [PATCH] compiler-gcc.h: don't set COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW for sparse

sparse errors out with

./include/linux/overflow.h:254:13: error: undefined identifier '__builtin_mul_overflow'
./include/linux/overflow.h:254:13: error: incorrect type in conditional
./include/linux/overflow.h:254:13:    got void
./include/linux/overflow.h:256:13: error: undefined identifier '__builtin_add_overflow'
./include/linux/overflow.h:256:13: error: incorrect type in conditional
./include/linux/overflow.h:256:13:    got void

Sparse has not acquired generic overflow builtins yet, so don't set
COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW for it.

Signed-off-by: Miroslav Benes <mbenes@...e.cz>
Acked-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 include/linux/compiler-gcc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index f1a7492a5cc8..15e55b89e952 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -344,6 +344,6 @@
  */
 #define uninitialized_var(x) x = x
 
-#if GCC_VERSION >= 50100
+#if GCC_VERSION >= 50100 && !defined(__CHECKER__)
 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
 #endif
-- 
2.17.0