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

[Hans Wennborg]

  Using fancy C++'ism instead of for loop.

Hi whunt,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1450?vs=3608&id=3613#toc

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]));
+  std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(),
+                 toLowercase);
   StringRef ProgNameRef(ProgName);
   StringRef Prefix;
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