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Compiler Warning (level 1) CS3012

Visual Studio 2008

You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly

In order for a module to be compliant with the Common Language Specification (CLS) through [module:System.CLCSompliant(true)], it must be built with the /target:module compiler option. For more information on the CLS, see Common Language Specification.

The following example, when built without /target:module, generates CS3012:

// CS3012.cs
// compile with: /W:1

[module:System.CLSCompliant(true)]   // CS3012
public class C
    public static void Main()