http://patchwork.ozlabs.org/patch/630200/

From 28cfdbbcb96a69087c3d21faf69b5eae7bcf6d69 Mon Sep 17 00:00:00 2001
From: Hodorgasm <nsane457@gmail.com>
Date: Wed, 11 May 2016 21:42:07 -0400
Subject: [PATCH] Cast to unsigned while left bit-shifting

GCC-6 now treats the left bitwise-shift of a negative integer as nonconformant so explicitly cast to an unsigned int while bit-shifting.

Downloaded from upstream PR:
https://github.com/mpruett/audiofile/pull/28

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
---
 libaudiofile/modules/SimpleModule.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libaudiofile/modules/SimpleModule.h b/libaudiofile/modules/SimpleModule.h
index 03c6c69..4014fb2 100644
--- a/libaudiofile/modules/SimpleModule.h
+++ b/libaudiofile/modules/SimpleModule.h
@@ -123,7 +123,7 @@ struct signConverter
 	typedef typename IntTypes<Format>::UnsignedType UnsignedType;
 
 	static const int kScaleBits = (Format + 1) * CHAR_BIT - 1;
-	static const int kMinSignedValue = -1 << kScaleBits;
+	static const int kMinSignedValue = static_cast<signed>(static_cast<unsigned>(-1) << kScaleBits);;
 
 	struct signedToUnsigned : public std::unary_function<SignedType, UnsignedType>
 	{