Rename test .c sources to .cpp where necessary (#604)

Remove hacks to force language from CMake files.

Closes KhronosGroup/OpenCL-CTS#25

test_conformance/buffers/array_info.cpp

@@ -0,0 +1,63 @@
+//
+// Copyright (c) 2017 The Khronos Group Inc.
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#include "harness/compat.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "procs.h"
+
+
+
+int test_array_info_size( cl_device_id deviceID, cl_context context, cl_command_queue queue, int num_elements )
+{
+    cl_mem          memobj;
+    cl_int          err;
+    size_t          w = 32, h = 32, d = 32;
+    size_t          retSize;
+    size_t          elementSize = sizeof( cl_int );
+
+    memobj = clCreateBuffer( context, (cl_mem_flags)(CL_MEM_READ_WRITE),  elementSize * w*h*d, NULL, &err);
+    test_error(err, "clCreateBuffer failed.");
+
+    err = clGetMemObjectInfo(memobj, CL_MEM_SIZE, sizeof( size_t ), (void *)&retSize, NULL);
+    if ( err ){
+        log_error( "Error calling clGetMemObjectInfo(): %d\n", err );
+        clReleaseMemObject(memobj);
+        return -1;
+    }
+    if ( (elementSize * w * h * d) != retSize ) {
+        log_error( "Error in clGetMemObjectInfo() check of size\n" );
+        clReleaseMemObject(memobj);
+        return -1;
+    }
+    else{
+        log_info( " CL_MEM_SIZE passed.\n" );
+    }
+
+    // cleanup
+    clReleaseMemObject(memobj);
+
+    return err;
+
+}   // end testArrayElementSize()
+
+
+// FIXME: need to test other flags
+