Is there any reason why ABI testing can't be in its own package? I.e. a
separate group/git/etc that contains a testsuite that verifies the ABI
is consistent. I bit of separation from the glibc project itself helps
keep the tests rigorous, and reduces dependencies wrt glibc itself.
You also want to run the tests more often than "once per build"
sometimes, and a separate package can do that as well as test the
installed ABI.