I just pulled changes from upstream and when I build with:

./configure --with-pydebug && make -j

Am getting a Segmentation fault:

./python -E -S -m sysconfig --generate-posix-vars ;\
if test $? -ne 0 ; then \
        echo "generate-posix-vars failed" ; \
        rm -f ./pybuilddir.txt ; \
        exit 1 ; \
fi
 CC='gcc -pthread' LDSHARED='gcc -pthread -shared    ' OPT='-g -Og -Wall'       _TCLTK_INCLUDES='' _TCLTK_LIBS=''       ./python -E ./setup.py  build
Segmentation fault (core dumped)
make: *** [Makefile:614: sharedmods] Error 139

I hope someone else can replicate this on:

o LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 19.04
Release:        19.04
Codename:       disco