[Python-Dev] once enabled gc won't go away until explicitly disabled?

[Skip Montanaro]

I had been running with --with-cycle-gc, then the mystery bug hit yesterday, 
so last night I was working on other stuff and wanted to disable it.  I
tried removing config.cache and then executing configure as

    ./configure --with-threads

but gc was still there.  Then I explicitly commented out the gc line in
Modules/Setup.config.  Still no luck.  Finally, I configured as

    ./configure --with-threads --without-cycle-gc

and then it went away.

Is this the correct behavior?

Skip