bug#11519: "Wrong type argument: characterp" building custom-deps while boostrapping

[Stefan Monnier]

> If you started looking, I think you can stop.  It's a %$#@!
> heisenbug.  If I add a single (message %s file) to
> custom-make-dependencies, it displays ethio-util.el as the last file
> name before the error.  But adding another message makes the problem
> disappear, and the bootstrap runs flawlessly to completion.  Likewise,
> running just "make custom-deps" with the emacs.exe built by the first
> stage of the bootstrap doesn't produce any errors.

I guess the best options is to change the makefile so it sets
debug-on-error (and/or starts Emacs under a debugger) in the area of
interest and hope that the problem will still show up.


        Stefan