Remove empty string in lib_dirs and include_dirs

theano/gof/cmodule.py

@@ -2118,8 +2118,10 @@ class GCC_compiler(Compiler):
             libs = []
         if preargs is None:
             preargs = []
-        else:
-            preargs = list(preargs)
+
+        # Remove empty string directory
+        include_dirs = [d for d in include_dirs if d]
+        lib_dirs = [d for d in lib_dirs if d]
 
         include_dirs = include_dirs + std_include_dirs()
         libs = libs + std_libs()

theano/sandbox/cuda/nvcc_compiler.py

@@ -188,6 +188,10 @@ class NVCC_compiler(Compiler):
         Otherwise nvcc never finish.
 
         """
+        # Remove empty string directory
+        include_dirs = [d for d in include_dirs if d]
+        lib_dirs = [d for d in lib_dirs if d]
+
         rpaths = list(rpaths)
 
         if sys.platform == "win32":