[Driver] Don't implicitly copy std::strings in for-range loop.

Found by -Wrange-loop-analysis.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@248495 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 3dd9979a78549d0d43af8efcc370fa16c8d92ee5..04ea874e206d672bac9d7c2687d7227d8aa642a6 100644 (file)
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -1497,7 +1497,7 @@ Generic_GCC::CudaInstallationDetector::init(const Driver &D,
     CudaPathCandidates.push_back(D.SysRoot + "/usr/local/cuda-7.0");
   }
 
-  for (const auto CudaPath : CudaPathCandidates) {
+  for (const auto &CudaPath : CudaPathCandidates) {
     if (CudaPath.empty() || !llvm::sys::fs::exists(CudaPath))
       continue;