From 2f8187933fe4ec8ae644dfe5d44ad3708f59dc71 Mon Sep 17 00:00:00 2001
From: Chad Rosier <mcrosier@apple.com>
Date: Thu, 18 Aug 2011 17:56:32 +0000
Subject: [PATCH] Use StringRef, rather than C string APIs.

llvm-svn: 137958
---
 clang/lib/Driver/Tools.cpp | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 295ab32aeeae..ca8b7d4bb993 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -2448,18 +2448,19 @@ darwin::CC1::getDependencyFileName(const ArgList &Args,
 void darwin::CC1::RemoveCC1UnsupportedArgs(ArgStringList &CmdArgs) const {
   for (ArgStringList::iterator it = CmdArgs.begin(), ie = CmdArgs.end(); 
        it != ie;) {
-    const char *Option = *it;
+
+    StringRef Option = *it;
 
     // We only remove warning options.
-    if (strncmp(Option, "-W", 2)) {
+    if (!Option.startswith("-W")) {
       ++it;
       continue;
     }
 
-    if (strncmp(Option, "-Wno-", 5))
-      Option = &Option[2];
+    if (Option.startswith("-Wno-"))
+      Option = Option.substr(5);
     else
-      Option = &Option[5];
+      Option = Option.substr(2);
 
     bool RemoveOption = llvm::StringSwitch<bool>(Option)
       .Case("address-of-temporary", true)