[Swig-user] error CS0246: The type or namespace name `IDisposable' could not be found

[Mathieu M. <ma...@de...>]

Dear all,

I am the maintainer of the GDCM package. It currently uses SWIG to
generate its C# API. Some users recently reported that GDCM now fails
to build using recent SWIG 3.x release (SWIG 2.x were fine). The error
is:

TagSetType.cs(11,27): error CS0246: The type or namespace name
`IDisposable' could not be found. Are you missing `System' using
directive?


Where:

[...]
$ head -12 ./Wrapping/Csharp/TagSetType.cs
/* ----------------------------------------------------------------------------
 * This file was automatically generated by SWIG (http://www.swig.org).
 * Version 3.0.2
 *
 * Do not make changes to this file unless you know what you are doing--modify
 * the SWIG interface file instead.
 * -----------------------------------------------------------------------------
*/

namespace gdcm {

public class TagSetType : IDisposable
#if SWIG_DOTNET_3
[...]

My question is:

- Should I add the missing `using System` using swig macros ?
- Is there a documentation for migrating from swig 2.x to swig 3.x ?

Thanks much,

ref: https://github.com/malaterre/GDCM/issues/10