solaris 1.1pre won't build xemacs 20.4

["Anthony J Heading" <heading_anthony at jpmorgan dot com>]

Hi,
     Just a data point, since I've no idea how to debug the problem.
1.1pre appears to miscompile xemacs 20.4 - during the build process
the new executable is invoked for various batch purposes.   One of these is

xemacs -batch -vanilla `pwd`/lisp/prim/cleantree -f batch-remove-old-elc
lisp

The lisp function appears to run almost to completion, but then blows up
with
Fatal error:  assertion failed, file .../src/elhash.c, line 109,
gc_in_progress

Looking at this, a hash table array length equal to -17, which as a
negative number has some deep magic internal significance to do with gc,
whereas setting a breakpoint at the corresponding point in gcc-2.7.2.3
reveals the same variable is there equal to +23.   So the actual error must
have been some time long before, and it's somewhat beyond my skills to
debug.

A