1 files changed, 21 insertions, 0 deletions
diff --git a/lib/CompilerDriver/Tool.cpp b/lib/CompilerDriver/Tool.cpp
index 9f4ab49566..5e558ca43c 100644
--- a/lib/CompilerDriver/Tool.cpp
+++ b/lib/CompilerDriver/Tool.cpp
@@ -17,6 +17,8 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/System/Path.h"
 
+#include <algorithm>
+
 using namespace llvm;
 using namespace llvmc;
 
@@ -71,3 +73,22 @@ sys::Path Tool::OutFilename(const sys::Path& In,
   }
   return Out;
 }
+
+namespace {
+  template <class A, class B>
+  bool CompareFirst (std::pair<A,B> p1, std::pair<A,B> p2) {
+    return std::less<A>()(p1.first, p2.first);
+  }
+}
+
+StrVector Tool::SortArgs(ArgsVector& Args) const {
+  StrVector Out;
+
+  // HACK: this won't be needed when we'll migrate away from CommandLine.
+  std::stable_sort(Args.begin(), Args.end(), &CompareFirst<unsigned, std::string>);
+  for (ArgsVector::iterator B = Args.begin(), E = Args.end(); B != E; ++B) {
+    Out.push_back(B->second);
+  }
+
+  return Out;
+}