loaddefs.el has no effect

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"GNU Emacs 22.0.50 (i386-msvc-nt5.1.2600)
of 2005-06-25 on LD1"

When I build Emacs I want some additional major modes to be part of the build.
Previously I just put the additional mode files in \lisp\progmodes and rebuild.
I pretty much always just do a BOOTSTRAP build.

Something has changed in the last month or two because this doesn't work any 
more.
loaddefs.el *does* contain the autoload commands for the new modes but Emacs 
doesn't recognize the mode commands.
If I manually do (load "loaddefs") then it works.
It's like the build doesn't actually use the rebuilt loaddefs.el contents.
I've gotten around it temporarily by replacing ldefs-boot.el with a rebuilt 
loaddefs.el.
Everything is pure CVS other than my adding 2 mode files to \lisp\progmodes and 
now this ldefs-boot.el workaround.

Thanks
Rick