Be case sensitive when determining driver mode based on argv[0] except on Windows

This narrows the impact of r188833 after Dimitry pointed out that it's good to be
able to tell the difference between 'cc' and 'CC'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@203624 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/tools/driver/driver.cpp b/tools/driver/driver.cpp
index b4b970397eb5cef06e76dcb4016393ea2b734833..e8860a21567b540d0a336fea05330fff846df5d6 100644 (file)
--- a/tools/driver/driver.cpp
+++ b/tools/driver/driver.cpp
@@ -227,8 +227,11 @@ static void ParseProgName(SmallVectorImpl<const char *> &ArgVector,
     { "++",        "--driver-mode=g++" },
   };
   std::string ProgName(llvm::sys::path::stem(ArgVector[0]));
+#ifdef _WIN32
+  // Transform to lowercase for case insensitive file systems.
   std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(),
                  toLowercase);
+#endif
   StringRef ProgNameRef(ProgName);
   StringRef Prefix;