Comment 3 for bug 1794999

Thanks for taking the time to report this bug and helping to make Ubuntu better.
I took a look at your patch and I don't think it is the best solution. As far as I can tell, the problem is actually caused because of toolchain (gcc) version in bionic. I've tried to build the same version of pam-python on Xenial and it worked. So changing the logic, like your patch does, will probably break something else during execution or bring up other problems.
Also checking the build of pam-python with gcc8 brings up more errors during build, besides the one you mentioned. So the project needs an update.
Have you tried to contact upstream maintainer?
http://pam-python.sourceforge.net/
It seems like the project is not being developed anymore, so it might be difficult to get an answer, but worth a try.
Let me know if you have problems in contacting upstream maintainer.