tqchen commented on a change in pull request #4532: [WIP] Support standardize 
runtime module
URL: https://github.com/apache/incubator-tvm/pull/4532#discussion_r359060092
 
 

 ##########
 File path: python/tvm/module.py
 ##########
 @@ -118,21 +122,22 @@ def export_library(self,
             self.save(file_name)
             return
 
-        if not (self.type_key == "llvm" or self.type_key == "c"):
-            raise ValueError("Module[%s]: Only llvm and c support export 
shared" % self.type_key)
+        module = self._lookup_dso_module()
+        assert module is not None, "We should have one dso module to export"
         temp = _util.tempdir()
         if fcompile is not None and hasattr(fcompile, "object_format"):
             object_format = fcompile.object_format
         else:
-            if self.type_key == "llvm":
+            if module.type_key == "llvm":
                 object_format = "o"
             else:
-                assert self.type_key == "c"
+                assert module.type_key == "c"
                 object_format = "cc"
         path_obj = temp.relpath("lib." + object_format)
-        self.save(path_obj)
+        module.save(path_obj)
 
 Review comment:
   this might hint us to have a test case where there are multiple llvm modules 
that imports each other

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