Modified link path in platforms/cuda/CMakeLists.txt to increase likelihood...

Modified link path in platforms/cuda/CMakeLists.txt to increase likelihood that CUDA_HAVE_GPU flag will be set.

platforms/cuda/CMakeLists.txt

@@ -17,7 +17,23 @@
 # Only run tests if this machine has a cuda-capable GPU
 # So run a little test program at configuration time to sniff for GPUs
 # find_package(CUDA) # find_package has already run and causes trouble w/ cmake 2.4
-message("Checking for working GPU...")
+# message("Checking for working GPU...")
+# On Peter E.'s computer, DYLD_LIBRARY_PATH does not include the CUDA path, so in order to 
+# get this gpu-sniffer to work, we need to set DYLD_LIBRARY_PATH here.
+get_filename_component(CUDART_DIR "${FOUND_CUDART}" PATH)
+file(TO_NATIVE_PATH "${CUDART_DIR}" CUDART_NATIVE_DIR)
+set(ALREADY_MODIFIED_PATH FALSE CACHE BOOL "Whether link path has been modified for GPU sniffer")
+mark_as_advanced(ALREADY_MODIFIED_PATH)
+if(NOT ALREADY_MODIFIED_PATH)
+    if(APPLE)
+            set(ENV{DYLD_LIBRARY_PATH} "$ENV{DYLD_LIBRARY_PATH}:${CUDART_NATIVE_DIR}")
+    elseif(UNIX)
+            set(ENV{LD_LIBRARY_PATH} "$ENV{LD_LIBRARY_PATH}:${CUDART_NATIVE_DIR}")
+    elseif(MSVC)
+            set(ENV{PATH} "$ENV{PATH};${CUDART_NATIVE_DIR}")
+    endif(APPLE)
+    set(ALREADY_MODIFIED_PATH TRUE CACHE BOOL "Whether link path has been modified for GPU sniffer" FORCE)
+endif(NOT ALREADY_MODIFIED_PATH)
 try_run(RUN_RESULT_VAR COMPILE_RESULT_VAR
     ${CMAKE_BINARY_DIR} 
     ${CMAKE_CURRENT_SOURCE_DIR}/tests/has_cuda_gpu.c
@@ -41,7 +57,7 @@ if(RUN_RESULT_VAR)
 endif(RUN_RESULT_VAR)
 if(CUDA_HAVE_GPU_MAYBE)
     set(CUDA_HAVE_GPU TRUE CACHE BOOL "Whether CUDA-capable GPU is present")
-    message("GPU check succeeded")
+    # message("GPU check succeeded")
 else(CUDA_HAVE_GPU_MAYBE)
     set(CUDA_HAVE_GPU FALSE CACHE BOOL "Whether CUDA-capable GPU is present")
     message("GPU check failed")