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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Compiler Warning (level 4) C4337

Error Message

cross-referenced type library 'typelib1' in 'typelib2' is being automatically imported

The auto_search attribute of the #import directive caused a type library to be implicitly imported.

Given two type libraries on disk created from the following two files (compiled with midl.exe):

// C4337a.idl
[
  uuid(F87070BA-C6D9-405C-A8E4-8CD9CA25C12B)
]
library C4337aLib
{
   [uuid(F87070BA-C6D9-405C-A8E4-8CD9CA25C12C)]
   enum E_C4337a
   {
      one = 0,
      two = 1,
      three = 2
    };
};

and then the second .idl file,

// C4337b.idl
[
   uuid(F87070BA-C6D9-405C-A8E4-8CD9CA25C12D)
]

library C4337bLib
{
   importlib("c4337a.tlb");

   [uuid(F87070BA-C6D9-405C-A8E4-8CD9CA25C12E)]
   struct S_C4337b
   {
      enum E_C4337a e;
   };
};

The following sample generates C4337:

// C4337.cpp
// compile with: /W4 /LD
#import "c4337b.tlb" auto_search   // C4337
// explicitly #import all type libraries to resolve
// #import "C4337a.tlb"
// #import "C4337b.tlb"

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