[PATCH] Use lowercase version of argv[0] when determining driver mode

[Hans Wennborg]

Hi whunt,

This makes a difference on Windows, where e.g. clang-cl might actually be called as CLANG-CL.

http://llvm-reviews.chandlerc.com/D1450

Files:
  tools/driver/driver.cpp

Index: tools/driver/driver.cpp
===================================================================
--- tools/driver/driver.cpp
+++ tools/driver/driver.cpp
@@ -226,6 +226,8 @@
     { "++",        "--driver-mode=g++" },
   };
   std::string ProgName(llvm::sys::path::stem(ArgVector[0]));
+  for (size_t i = 0, e = ProgName.length(); i != e; ++i)
+    ProgName[i] = toLowercase(ProgName[i]);
   StringRef ProgNameRef(ProgName);
   StringRef Prefix;
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