Minor fixes and cleanup

olla/src/Platform.cpp

@@ -272,7 +272,8 @@ const string& Platform::getDefaultPluginsDirectory() {
     }
 #else
     if (dir == NULL)
-        dir = "/usr/local/openmm/lib/plugins";
+        directory = "/usr/local/openmm/lib/plugins";
+    else
         directory = string(dir);
 #endif
     return directory;

platforms/cuda/src/CudaPlatform.cpp

@@ -101,14 +101,13 @@ CudaPlatform::CudaPlatform() {
 	string nvcc = (compiler == NULL ? "/usr/local/cuda/bin/nvcc" : string(compiler));
     setPropertyDefaultValue(CudaCompiler(), nvcc);
     char* tmpdir = getenv("TMPDIR");
-    if (tmpdir == NULL)
-        tmpdir = P_tmpdir;
-    setPropertyDefaultValue(CudaTempDirectory(), string(tmpdir));
+    string tmp = (tmpdir == NULL ? string(P_tmpdir) : string(tmpdir));
+    setPropertyDefaultValue(CudaTempDirectory(), tmp);
 #endif
 }
 
 bool CudaPlatform::supportsDoublePrecision() const {
-    return false;
+    return true;
 }
 
 const string& CudaPlatform::getPropertyValue(const Context& context, const string& property) const {

platforms/cuda/src/CudaSort.h

@@ -101,6 +101,8 @@ private:
  */
 class CudaSort::SortTrait {
 public:
+    virtual ~SortTrait() {
+    }
     /**
      * Get the size of each data value in bytes.
      */

platforms/opencl/src/OpenCLPlatform.cpp

@@ -83,7 +83,7 @@ OpenCLPlatform::OpenCLPlatform() {
 }
 
 bool OpenCLPlatform::supportsDoublePrecision() const {
-    return false;
+    return true;
 }
 
 const string& OpenCLPlatform::getPropertyValue(const Context& context, const string& property) const {