Re: SWIG: GCC compile errors with unsigned char when using the compactdefaultargs or kwargs feature

On Fri, 12 Jun 2020 at 08:08, Terry Barnaby <[email protected]> wrote:

> Hi,
>
> I have an error appearing during compilation of the SWIG output file
> when I try to use either or both of the "compactdefaultargs" and
> "kwargs" features when using unsigned char's.
>
> This is with swig-4.0.1-3.fc31.src.rpm and GCC 9.3.1 on Fedora31.
>
> I get the GCC error:
>
> bds_wrap.cpp: In function ‘PyObject* _wrap_new_BArrayBUInt8(PyObject*,
> PyObject*, PyObject*)’:
> bds_wrap.cpp:2947:40: error: expected primary-expression before ‘unsigned’
>   2947 |   unsigned char arg1 = (unsigned char) unsigned char() ;
>
> A simple example is shown below. If I use single keyword types like
> "int", "char" all is fine.
>
> Any idea what I am doing wrong (G++ options or is this a bug in SWIG ) ?
>
> Terry
>
>
> /*******************************************************************************
>   *    Test1.swig    Shows an error
>
>   *******************************************************************************
>   */
> %module bdslib
>
> %feature("compactdefaultargs");
> %feature("kwargs");
>
>
The "compactdefaultargs" feature has some flaws and this is one of them.
The primary flaw is documented at
http://swig.org/Doc4.0/SWIGPlus.html#SWIGPlus_default_args. Just
selectively turn them off BArray by replacing the above two lines with:

%feature("compactdefaultargs");
%feature("compactdefaultargs", "0") BArray;
%feature("kwargs");
%feature("kwargs", "0") BArray;

William

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