Support for the define argument (-D) in the CUDA mode

lib/Interpreter/IncrementalCUDADeviceCompiler.cpp

@@ -153,6 +153,13 @@ namespace cling {
     */
     std::vector<std::string> additionalPtxOpt;
 
+    // search for defines (-Dmacros=value) in the args and add them to the PTX
+    // compiler args
+    for (const char* arg : invocationOptions.CompilerOpts.Remaining) {
+      std::string s = arg;
+      if (s.compare(0, 2, "-D") == 0) additionalPtxOpt.push_back(s);
+    }
+
     m_CuArgs.reset(new IncrementalCUDADeviceCompiler::CUDACompilerArgs(
         cppStdVersion, optLevel, smVersion, ptxSmVersion, fatbinSmVersion,
         fatbinArch, invocationOptions.Verbose(), debug, additionalPtxOpt,

test/CUDADeviceCode/CUDADefineArg.C

@@ -0,0 +1,40 @@
+//------------------------------------------------------------------------------
+// CLING - the C++ LLVM-based InterpreterG :)
+//
+// This file is dual-licensed: you can choose to license it under the University
+// of Illinois Open Source License or the GNU Lesser General Public License. See
+// LICENSE.TXT for details.
+//------------------------------------------------------------------------------
+
+// The Test checks whether a define argument (-DTEST=3) is passed to the PTX 
+// compiler. If it works, it should not throw an error.
+// RUN: cat %s | %cling -DTEST=3 -x cuda -Xclang -verify 2>&1 | FileCheck %s
+// REQUIRES: cuda-runtime
+
+#include <iostream>
+
+// Check if cuda driver is available
+int version;
+cudaDriverGetVersion(&version)
+// CHECK: (cudaError_t) (cudaError::cudaSuccess) : (unsigned int) 0
+
+// Check if a CUDA compatible device (GPU) is available.
+int device_count = 0;
+cudaGetDeviceCount(&device_count)
+// CHECK: (cudaError_t) (cudaError::cudaSuccess) : (unsigned int) 0
+device_count > 0
+// CHECK: (bool) true
+
+TEST
+// CHECK: (int) 3
+
+.rawInput 1
+
+__global__ void g(){
+    int i = TEST;
+}
+
+.rawInput 0
+
+// expected-no-diagnostics
+.q