bootstrap error in c-mode with CANNOT_DUMP

[Ken Raeburn]

I'm doing some experimenting with some changes that require linking in  
a new library and calling some code early in the Emacs process.  Since  
the library isn't currently unexec-friendly, I'm trying some builds  
without using unexec.  I find that I can't do a bootstrap.  If I do  
"configure ... CPPFLAGS=-DCANNOT_DUMP" with current (unhacked) CVS  
sources and try "make bootstrap", I eventually get this error:

Wrote /Users/raeburn/dev/e/fsf/lisp/progmodes/cfengine.elc
Compiling /Users/raeburn/dev/e/fsf/lisp/progmodes/cmacexp.el
Warning: Lisp directory `/Users/raeburn/dev/e/fsf/bld/Inst/share/emacs/ 
23.0.94/site-lisp' does not exist.
Warning: Lisp directory `/Users/raeburn/dev/e/fsf/bld/Inst/share/emacs/ 
site-lisp' does not exist.
Warning: Lisp directory `/Users/raeburn/dev/e/fsf/bld/Inst/share/emacs/ 
23.0.94/lisp' does not exist.
Warning: Lisp directory `/Users/raeburn/dev/e/fsf/bld/Inst/share/emacs/ 
23.0.94/leim' does not exist.
Loading loadup.el (source)...
Using load-path (/Users/raeburn/dev/e/fsf/lisp)
Loading emacs-lisp/byte-run...
[....]
Loading tooltip...
((66226 . 4511) (13575 . 0) (649 . 67) 96380 876313 (122 . 7) (22 . 8)  
(6632 . 5779))
Finding pointers to doc strings...
Finding pointers to doc strings...done
Loading cc-langs...
Eval error in the `c-lang-defconst' for `c-cpp-matchers' in c-mode:
Eval error in the `c-lang-defconst' for `c-matchers-1' in c-mode:

In toplevel form:
../../lisp/progmodes/cmacexp.el:97:1:Error: `c-opt-cpp-prefix' got no  
(prior) value in c-mode (might be a cyclic reference)
make[2]: *** [/Users/raeburn/dev/e/fsf/lisp/progmodes/cmacexp.elc]  
Error 1

Without CANNOT_DUMP, it bootstraps just fine; I'm not sure why there  
should be a difference.

Ken