Dockerised Python with LTO enabled and `-fno-semantic-interposition` compiler flag

Dockerfile

# Python base image with tweaks - Mostly derivied from https://github.com/docker-library/python/blob/218e80410245922ec8e78ca8ca6630c5f47ca445/3.8/bullseye/Dockerfile
# Modification are highlighted by comments prefixed by "HACK: "
# {{
FROM buildpack-deps:bullseye

# ensure local python is preferred over distribution python
ENV PATH /usr/local/bin:$PATH

# http://bugs.python.org/issue19846
# > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
ENV LANG C.UTF-8

# runtime dependencies
RUN set -eux; \
	apt-get update; \
	apt-get install -y --no-install-recommends \
		libbluetooth-dev \
		tk-dev \
		uuid-dev \
	; \
	rm -rf /var/lib/apt/lists/*

ENV GPG_KEY E3FF2839C048B25C084DEBE9B26995E310250568
ENV PYTHON_VERSION 3.8.13

RUN set -eux; \
	\
	wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz"; \
	wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc"; \
	GNUPGHOME="$(mktemp -d)"; export GNUPGHOME; \
	# HACK: Put 443 port explicitly so I can build it.
	gpg --batch --keyserver hkps://keys.openpgp.org:443 --recv-keys "$GPG_KEY"; \
	gpg --batch --verify python.tar.xz.asc python.tar.xz; \
	command -v gpgconf > /dev/null && gpgconf --kill all || :; \
	rm -rf "$GNUPGHOME" python.tar.xz.asc; \
	mkdir -p /usr/src/python; \
	tar --extract --directory /usr/src/python --strip-components=1 --file python.tar.xz; \
	rm python.tar.xz; \
	\
	cd /usr/src/python; \
	gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; \
	./configure \
		--build="$gnuArch" \
		--enable-loadable-sqlite-extensions \
		--enable-optimizations \
		--enable-option-checking=fatal \
		--enable-shared \
		--with-system-expat \
		--without-ensurepip \
		# HACK: Enabled LTO as suggested by Python docs.
		--with-lto \
	; \
	nproc="$(nproc)"; \
	# HACK: Enable no-semantic-interposition flag with next three lines, this is not present in --enable-optimizations before 3.10
	CFLAGS="-fno-semantic-interposition" \
	CFLAGS_NODIST="-fno-semantic-interposition" \
	LDFLAGS_NODIST="-fno-semantic-interposition" \
	make -j "$nproc" \
	; \
	make install; \
	\
# enable GDB to load debugging data: https://github.com/docker-library/python/pull/701
	bin="$(readlink -ve /usr/local/bin/python3)"; \
	dir="$(dirname "$bin")"; \
	mkdir -p "/usr/share/gdb/auto-load/$dir"; \
	cp -vL Tools/gdb/libpython.py "/usr/share/gdb/auto-load/$bin-gdb.py"; \
	\
	cd /; \
	rm -rf /usr/src/python; \
	\
	find /usr/local -depth \
		\( \
			\( -type d -a \( -name test -o -name tests -o -name idle_test \) \) \
			-o \( -type f -a \( -name '*.pyc' -o -name '*.pyo' -o -name 'libpython*.a' \) \) \
			-o \( -type f -a -name 'wininst-*.exe' \) \
		\) -exec rm -rf '{}' + \
	; \
	\
	ldconfig; \
	\
	python3 --version

# make some useful symlinks that are expected to exist ("/usr/local/bin/python" and friends)
RUN set -eux; \
	for src in idle3 pydoc3 python3 python3-config; do \
		dst="$(echo "$src" | tr -d 3)"; \
		[ -s "/usr/local/bin/$src" ]; \
		[ ! -e "/usr/local/bin/$dst" ]; \
		ln -svT "$src" "/usr/local/bin/$dst"; \
	done

# if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
ENV PYTHON_PIP_VERSION 22.0.4
# https://github.com/docker-library/python/issues/365
ENV PYTHON_SETUPTOOLS_VERSION 57.5.0
# https://github.com/pypa/get-pip
ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/6ce3639da143c5d79b44f94b04080abf2531fd6e/public/get-pip.py
ENV PYTHON_GET_PIP_SHA256 ba3ab8267d91fd41c58dbce08f76db99f747f716d85ce1865813842bb035524d

RUN set -eux; \
	\
	wget -O get-pip.py "$PYTHON_GET_PIP_URL"; \
	echo "$PYTHON_GET_PIP_SHA256 *get-pip.py" | sha256sum -c -; \
	\
	export PYTHONDONTWRITEBYTECODE=1; \
	\
	python get-pip.py \
		--disable-pip-version-check \
		--no-cache-dir \
		--no-compile \
		"pip==$PYTHON_PIP_VERSION" \
		"setuptools==$PYTHON_SETUPTOOLS_VERSION" \
	; \
	rm -f get-pip.py; \
	\
	pip --version
# }}