Fix Tarball build for Python plugin

[barnabasdomozi]

No description provided.

[Copilot]

Pull request overview

Updates the GitLab CI dependency/toolchain build scripts to support building and running the Python plugin from tarball artifacts, primarily by producing a shared Python build and ensuring its runtime libraries are discoverable.

Changes:

• Build CPython 3.9 with --enable-shared and extend LD_LIBRARY_PATH to include python-install/lib.
• Ensure CodeCompass build environment includes python-install/lib in LD_LIBRARY_PATH.
• Point Boost’s bootstrap to the installed python3 binary instead of python.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
.gitlab/build-deps.sh	Builds Python as shared, exports Python lib dir to LD_LIBRARY_PATH, and switches Boost’s --with-python to python3.
.gitlab/build-codecompass.sh	Extends build-time LD_LIBRARY_PATH with the Python lib directory.

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[Copilot]

--enable-shared typically makes the installed python3 binary depend on libpython3.9.so in $DEPS_INSTALL_RUNTIME_DIR/python-install/lib. Right now this script compensates by exporting LD_LIBRARY_PATH later, but other runtime entrypoints (e.g. .gitlab/cc-env.sh, which is used for running tools interactively) don’t include python-install/lib, so python3 can fail to start outside this script. Consider either (a) updating the runtime environment scripts to include python-install/lib as well, or (b) adding an rpath during the Python build so the interpreter can locate its own lib directory without relying on LD_LIBRARY_PATH.

[mcserep]

Maybe this is a valid concern? @barnabasdomozi

[Copilot]

This LD_LIBRARY_PATH construction can leave a trailing : when $LD_LIBRARY_PATH is empty/unset, which adds the current working directory to the dynamic loader search path. To avoid security/non-determinism issues, append the existing value conditionally (only when non-empty).

Suggested change

	:$LD_LIBRARY_PATH
	${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}