Aller Anfang ist schwer.

.gitignore

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+.venv
+compose.override.yaml

Containerfile.debian

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+# syntax=docker/dockerfile:1
+
+ARG GOLANG_VERSION=1.25
+ARG DEBIAN_VERSION=trixie
+ARG PYTHON_VERSION=3.14
+
+FROM docker.io/library/golang:${GOLANG_VERSION}-${DEBIAN_VERSION} AS gobuilder
+
+RUN --mount=type=bind,source=./libmxclient,target=/build <<EOF
+cd /build
+CGO_ENABLED=1 GOARCH=${GOARCH} go build -buildmode=c-shared -o /pygomx-build/libmxclient.so .
+EOF
+
+FROM docker.io/library/python:${PYTHON_VERSION}-${DEBIAN_VERSION} AS pybuilder
+
+COPY --from=gobuilder /pygomx-build/libmxclient.so /usr/local/lib/libmxclient.so
+COPY --from=gobuilder /pygomx-build/libmxclient.h /usr/local/include/libmxclient.h
+
+RUN pip install cffi setuptools
+
+COPY pygomx /pygomx
+
+RUN <<EOF
+cd /pygomx
+python3 build_ffi.py
+ls -la
+EOF
+
+FROM docker.io/library/python:${PYTHON_VERSION}-${DEBIAN_VERSION}
+
+RUN pip install cffi
+
+COPY --from=gobuilder /pygomx-build/libmxclient.so /usr/local/lib/
+COPY --from=pybuilder /pygomx/_pygomx.cpython-314-x86_64-linux-gnu.so /usr/local/lib/python3.14/site-packages/
+RUN ldconfig
+

libmxclient/go.mod

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+module mxclientlib
+
+go 1.23.5

libmxclient/mxclientlib.go

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+package main
+
+import "C"
+
+//export hello
+func hello(name *C.char) *C.char {
+	goName := C.GoString(name)
+	result := "Hello " + goName
+	return C.CString(result)
+}
+
+func main() {}

pygomx/build_ffi.py

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+#!/usr/bin/python
+from cffi import FFI
+
+ffibuilder = FFI()
+
+ffibuilder.set_source(
+    module_name="_pygomx",
+    source=""" //passed to the real C compiler
+        #include "libmxclient.h"
+    """,
+    libraries=["mxclient"],
+)
+
+ffibuilder.cdef(
+    csource="""
+    extern char* hello(char* p0);
+    """
+)
+
+if __name__ == "__main__":
+    ffibuilder.compile(verbose=True)