Fix visiblity and windows problems in cnmem (tested only on Linux)

theano/sandbox/cuda/__init__.py

@@ -190,10 +190,6 @@ if compile_cuda_ndarray and cuda_available:
                             os.makedirs(tmpdir)
 
                     compiler = nvcc_compiler.NVCC_compiler()
-                    if sys.platform == 'darwin' and config.lib.cnmem:
-                        raise Exception(
-                            "Currently CNMeM isn't supported on Mac due to"
-                            " problems with symbols on Mac.")
                     compiler.compile_str(
                             'cuda_ndarray',
                             code,
@@ -201,7 +197,6 @@ if compile_cuda_ndarray and cuda_available:
                             include_dirs=[cuda_path],
                             libs=[config.cublas.lib],
                             preargs=['-O3'] + compiler.compile_args(),
-                            hide_symbols=config.lib.cnmem,
                     )
                     from cuda_ndarray.cuda_ndarray import *
             except Exception as e:

theano/sandbox/cuda/cnmem.h

@@ -41,8 +41,12 @@
 #define CNMEM_API __declspec(dllimport)
 #endif
 #else
+#ifdef CNMEM_DLLEXPORT
+#define CNMEM_API __attribute__((visibility ("default")))
+#else
 #define CNMEM_API
 #endif
+#endif
 
 #define CNMEM_VERSION 100 // It corresponds to 1.0.0
 
@@ -249,7 +253,7 @@ cnmemStatus_t CNMEM_API cnmemPrintMemoryState(FILE *file, cudaStream_t stream);
 /**
  * \brief Converts a cnmemStatus_t value to a string.
  */
-const char* cnmemGetErrorString(cnmemStatus_t status);
+const char* CNMEM_API cnmemGetErrorString(cnmemStatus_t status);
 
 /* ********************************************************************************************* */
 

theano/sandbox/cuda/cuda_ndarray.cu

@@ -9,6 +9,10 @@
 
 #include "cuda_ndarray.cuh"
 
+#ifndef CNMEM_DLLEXPORT
+#define CNMEM_DLLEXPORT
+#endif
+
 #include "cnmem.h"
 #include "cnmem.cpp"