Build a Debug+Valgrind version of Python 3.8.8, NumPy 1.18.2, and GDB 8.1.1

cpython_dbg_valgrind.sh

#!/bin/bash
set -euxo pipefail

install_prefix=~/.local/opt/cpython/3.8.8-dbg
jobs=4

# CPython
# https://stackoverflow.com/a/20126802/7829525
(
    [ ! -d cpython ] && git clone https://github.com/python/cpython
    cd cpython
    git fetch && git checkout v3.8.8
    make clean || :
    ./configure --with-pydebug CFLAGS='-O0 -g' --enable-shared \
            --prefix=${install_prefix} \
            LDFLAGS=-Wl,-rpath=${install_prefix}/lib \
            --with-ensurepip=upgrade \
            --without-pymalloc --with-valgrind
    make -j ${jobs} install
)

${install_prefix}/bin/pip3 install gnureadline==8.0.0

# NumPy
(
    [ ! -d numpy ] && git clone https://github.com/numpy/numpy.git
    cd numpy
    git fetch && git checkout v1.18.2
    # Ensure we have Cython.
    ${install_prefix}/bin/pip3 install cython==0.29.16
    ${install_prefix}/bin/python3 setup.py build --debug -j ${jobs} install \
        --prefix ${install_prefix}
)

# GDB - since it uses Python.
<<'EOF'
# Add the following to `~/.gdbinit` to debug CPython C extensions
python
# http://droettboom.com/blog/2015/11/20/gdb-python-extensions/
def setup_python(event):
    import libpython
gdb.events.new_objfile.connect(setup_python)
end
EOF

(
    which makeinfo || (
        echo -e "Need to run:\n\n\n  sudo apt install texinfo\n\n"
        exit 1
    )
    [ ! -d binutils-gdb ] && git clone git://sourceware.org/git/binutils-gdb.git
    cd binutils-gdb
    git fetch && git checkout gdb-8.1.1-release
    ./configure \
        LIBS='-lpython3.8d' LDFLAGS="-L${install_prefix}/lib" \
        --prefix ${install_prefix} --with-python
    make -j ${jobs} VERBOSE=1
    make -j ${jobs} -C gdb install
)

# Consider some bash help:
# https://gist.github.com/EricCousineau-TRI/6870970d68f75d23061177a52932a5d1#file-bash_helper_functions-sh

Should fix per comment here:
https://gitter.im/pybind/Lobby?at=5f00c7dbfa0c9221fc7b669d