This file was only used during ocamldebug sessions (in the dev/db
script). It was containing a large subset of the core cma files,
up to the printing functions. There were a few notable exceptions,
for instance no kernel/vm.cmo to avoid loading dllcoqrun.so in ocamldebug.
But printers.cma was troublesome to maintain : almost each time an ML file
was added/removed/renamed in the core of Coq, dev/printers.mllib
had to be edited, in addition to the directory-specific .mllib
(kernel/kernel.mllib and co). So I propose here to kill this file,
and put instead in dev/db several "load_printer" of the core cma files.
For that to work, we need to compile kernel/kernel.cma with the right
-dllib and -dllpath options, but that shouldn't hurt (on the contrary).
We also source now the camlpX cma in dev/db, via a new generated file
dev/camlp4.dbg containing a load_printer of either gramlib.cma or
camp4lib.cma.
If one doesn't want to perform the whole "source db" at the start
of an ocamldebug session, then the former "load_printer printers.cma"
could be replaced by:
source core.dbg
load_printer top_printers.cmo
See for instance the minimal dev/base_db.