Ensure compatibility with a single shared libvips library

[kleisauke]

See: #443

Tested on Linux using this Dockerfile:

Details

# Build and run with:
# docker build -t pyvips-libvips-packaging .
# docker run -it --rm pyvips-libvips-packaging
FROM python:3.12-slim-bookworm

LABEL maintainer="Kleis Auke Wolthuizen <info@kleisauke.nl>"

ARG VIPS_VERSION=8.15.0

WORKDIR /opt/libvips

# Update packages
RUN apt-get update -q \
    # Install needed dependencies
    && apt-get install -qy --no-install-recommends \
        ca-certificates \
        curl \
        git \
    # Download pre-built libvips binaries
    && curl -Ls https://github.com/kleisauke/libvips-packaging/releases/download/v$VIPS_VERSION/libvips-$VIPS_VERSION-linux-x64.tar.gz | tar -xzC .

WORKDIR /app

# Ensure dynamic linker finds the pre-built libvips binaries
ENV LD_LIBRARY_PATH=/opt/libvips/lib

RUN pip install --user git+https://github.com/kleisauke/pyvips.git@single-shared-vips-compat \
    && pip show pyvips

CMD ["python"]

And on Windows by using the -static (not static-ffi) binaries from:
https://github.com/libvips/build-win64-mxe/releases/tag/v8.15.1

[jcupitt]

Nice!

I vaguely remember needing separate opens for glib and gobject on some *nix platform, but of course I can't remember which, and this patch seems to work fine.