add the g++ and nvcc compiler string in the hash of the module.

theano/gof/cc.py

@@ -989,11 +989,12 @@ class CLinker(link.Linker):
                           compile_args=self.compile_args(),
                           libraries=self.libraries(),
                           header_dirs=self.header_dirs(),
+                          c_compiler=self.c_compiler(),
                           )
 
     @staticmethod
     def cmodule_key_(env, no_recycling, compile_args=None, libraries=None,
-                     header_dirs=None, insert_config_md5=True):
+                     header_dirs=None, insert_config_md5=True, c_compiler=None):
         """
         Do the actual computation of cmodule_key in a static method
         to allow it to be reused in scalar.Composite.__eq__
@@ -1039,6 +1040,8 @@ class CLinker(link.Linker):
         # DynamicModule always add the include <numpy/arrayobject.h>
         sig.append('NPY_ABI_VERSION=0x%X' %
                    numpy.core.multiarray._get_ndarray_c_version())
+        if c_compiler:
+            sig.append('c_compiler_str=' + c_compiler.version_str())
 
         # IMPORTANT: The 'md5' prefix is used to isolate the compilation
         # parameters from the rest of the key. If you want to add more key

theano/gof/cmodule.py

@@ -348,7 +348,8 @@ def get_module_hash(src_code, key):
                 # This is the md5 hash of the config options. We can stop
                 # here.
                 break
-            elif key_element.startswith('NPY_ABI_VERSION=0x'):
+            elif (key_element.startswith('NPY_ABI_VERSION=0x') or
+                  key_element.startswith('c_compiler_str=')):
                 to_hash.append(key_element)
             else:
                 raise AssertionError(error_msg)
@@ -1430,6 +1431,10 @@ def gcc_version():
 
 
 class GCC_compiler(object):
+    @staticmethod
+    def version_str():
+        return "g++ " + gcc_version_str
+
     @staticmethod
     def compile_args():
         cxxflags = [flag for flag in config.gcc.cxxflags.split(' ') if flag]

theano/gof/compiledir.py

@@ -119,6 +119,7 @@ def cleanup():
     1) keys that have an ndarray in them.
        Now we use a hash in the keys of the constant data.
     2) key that don't have the numpy ABI version in them
+    3) They do not have a compile version string
 
     If there is no key left for a compiled module, we delete the module.
     """
@@ -134,15 +135,18 @@ def cleanup():
                     keydata = cPickle.load(file)
                     for key in list(keydata.keys):
                         have_npy_abi_version = False
+                        have_c_compiler = False
                         for obj in flatten(key):
                             if isinstance(obj, numpy.ndarray):
                                 keydata.remove_key(key)
                                 break
-                            if (isinstance(obj, basestring) and
-                                obj.startswith('NPY_ABI_VERSION=0x')):
-                                have_npy_abi_version = True
+                            elif isinstance(obj, basestring):
+                                if obj.startswith('NPY_ABI_VERSION=0x'):
+                                    have_npy_abi_version = True
+                                elif obj.startswith('c_compiler_str='):
+                                    have_c_compiler = True
 
-                        if not have_npy_abi_version:
+                        if not have_npy_abi_version or not have_c_compiler:
                             keydata.remove_key(key)
                     if len(keydata.keys) == 0:
                         shutil.rmtree(os.path.join(compiledir, directory))

theano/sandbox/cuda/nvcc_compiler.py

@@ -75,6 +75,10 @@ def add_standard_rpath(rpath):
 
 
 class NVCC_compiler(object):
+    @staticmethod
+    def version_str():
+        return "nvcc " + nvcc_version
+
     @staticmethod
     def compile_args():
         """