Package conflicts trying to install jpegdupes package

[Chris Angelico]

On Mon, Sep 27, 2021 at 10:49 PM Skip Montanaro
<skip.montanaro at gmail.com> wrote:
>
> I'd like to use the jpegdupes package <https://pypi.org/project/jpegdupes/> but
> can't seem to get past compilation issued related to jpegtrans-cffi.
> Attempts to install any available versions on my XUbuntu system crap out
> with this C compiler error message:
>
>      In file included from
> jpegtran/__pycache__/_cffi__xd2d84bdexcdb1023.c:267:
>     src/epeg_private.h:71:17: warning: ‘_jpeg_init_source’ declared
> ‘static’ but never defined [-Wunused-function]
>        71 | METHODDEF(void) _jpeg_init_source(j_decompress_ptr cinfo);
>           |                 ^~~~~~~~~~~~~~~~~
>     src/epeg_private.h:72:20: warning: ‘_jpeg_fill_input_buffer’ declared
> ‘static’ but never defined [-Wunused-function]
>        72 | METHODDEF(boolean) _jpeg_fill_input_buffer(j_decompress_ptr
> cinfo);
>           |                    ^~~~~~~~~~~~~~~~~~~~~~~
>     src/epeg_private.h:73:17: warning: ‘_jpeg_skip_input_data’ declared
> ‘static’ but never defined [-Wunused-function]
>        73 | METHODDEF(void) _jpeg_skip_input_data(j_decompress_ptr cinfo,
> long num_bytes);
>           |                 ^~~~~~~~~~~~~~~~~~~~~
>     src/epeg_private.h:74:17: warning: ‘_jpeg_term_source’ declared
> ‘static’ but never defined [-Wunused-function]
>        74 | METHODDEF(void) _jpeg_term_source(j_decompress_ptr cinfo);
>           |                 ^~~~~~~~~~~~~~~~~
>     src/epeg_private.h:76:17: warning: ‘_jpeg_init_destination’ declared
> ‘static’ but never defined [-Wunused-function]
>        76 | METHODDEF(void) _jpeg_init_destination(j_compress_ptr cinfo);
>           |                 ^~~~~~~~~~~~~~~~~~~~~~
>     src/epeg_private.h:77:20: warning: ‘_jpeg_empty_output_buffer’ declared
> ‘static’ but never defined [-Wunused-function]
>        77 | METHODDEF(boolean) _jpeg_empty_output_buffer (j_compress_ptr
> cinfo);
>           |                    ^~~~~~~~~~~~~~~~~~~~~~~~~
>     src/epeg_private.h:78:17: warning: ‘_jpeg_term_destination’ declared
> ‘static’ but never defined [-Wunused-function]
>        78 | METHODDEF(void) _jpeg_term_destination (j_compress_ptr cinfo);
>           |                 ^~~~~~~~~~~~~~~~~~~~~~

Those are all warnings. Are there any errors that follow them?

>     ...
> This seems like a rather odd error message for a presumably sort-of-stable
> PyPI package. Looking at the version dependencies I see 2.6, 2.7, 3.3 or
> PyPy. I thought nmybe I needed to try with Python2... Create a Conda
> environment, attempt to install jpegdupes, only to discover it's Python 3
> only.
>
> So, I'm kind of stuck. Maybe I need to install Python 3.3 and try that? Any
> other ideas?
>

The package doesn't seem to have had a release since 2018, but the
GitHub repository has had changes as recently as a month ago. You
might have better luck cloning the repo and building that.

ChrisA