From d58cb7b41ac1912fafcc3a52424c30b94905686d Mon Sep 17 00:00:00 2001
From: Yaron Keren <yaron.keren@gmail.com>
Date: Sat, 4 Oct 2014 19:58:30 +0000
Subject: [PATCH] Solve Visual C++ warning C4805 on getAsInteger<bool>.

Fix http://llvm.org/PR21158 by adding a cast to unsigned long long,
so the comparison would be between two unsigned long longs instead
of bool and unsigned long long.

      if (getAsUnsignedInteger(*this, Radix, ULLVal) ||
          static_cast<unsigned long long>(static_cast<T>(ULLVal)) != ULLVal)

llvm-svn: 219065
---
 include/llvm/ADT/StringRef.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/llvm/ADT/StringRef.h b/include/llvm/ADT/StringRef.h
index f1861c8f92b..778fa10a32c 100644
--- a/include/llvm/ADT/StringRef.h
+++ b/include/llvm/ADT/StringRef.h
@@ -347,8 +347,11 @@ namespace llvm {
     typename std::enable_if<!std::numeric_limits<T>::is_signed, bool>::type
     getAsInteger(unsigned Radix, T &Result) const {
       unsigned long long ULLVal;
+      // The additional cast to unsigned long long is required to avoid the
+      // Visual C++ warning C4805: '!=' : unsafe mix of type 'bool' and type
+      // 'unsigned __int64' when instantiating getAsInteger with T = bool.
       if (getAsUnsignedInteger(*this, Radix, ULLVal) ||
-            static_cast<T>(ULLVal) != ULLVal)
+          static_cast<unsigned long long>(static_cast<T>(ULLVal)) != ULLVal)
         return true;
       Result = ULLVal;
       return false;