This repo contains a quick and dirty test for glibc_version_header.

The GitHub Actions workflow will build the test programs on Ubuntu 20.04 and then run them on older versions of Ubuntu to show that they work/fail with/without glibc_version_header.

You can build locally by running build.sh. You can confirm which versions of glibc functions got used via objdump -T test-[no]downlevel. (expf in particular is expected to be different.)