Hidden module c'tors/d'tors?

[dsimcha]

I'm getting annoying runtime errors about "Cycle detected between modules with
ctors/dtors" in a large program that doesn't have any module c'tors/d'tors, at
least not explicitly.  (i.e. there's no static this or static ~this in the
whole project, not counting the libs it imports).  Is there any way a module
c'tor/d'tor could be hidden, such that there is one even if there's no actual
static this statement?