Date: Sat, 5 Sep 1998 14:33:27 +0200
Message-Id: <199809051233.OAA00550@infbsstq.ips.cs.tu-bs.de>
From: Christian Lindig <lindig@ips.cs.tu-bs.de>
To: Caml Mailing List <caml-list@inria.fr>
Subject: ocamlopt and ocamldep
The ocamldep utility in OCaml 2.0 creates for a file concept.mli that
uses modules Bitrelation and Bitset a dependency of the following
form:
concept.cmi: bitrelation.cmo bitset.cmo
When compiling for native code this causes uncessessary recompilations
of the files bitrelation.ml and bitset.ml:
% make colibri.cmxa
ocamlopt.opt -I ../libcolibri -I ../getopt -c stat.mli
ocamlopt.opt -I ../libcolibri -I ../getopt -c stat.ml
--> ocamlopt.opt -I ../libcolibri -I ../getopt -c bitset.ml
--> ocamlopt.opt -I ../libcolibri -I ../getopt -c bitrelation.ml
ocamlopt.opt -I ../libcolibri -I ../getopt -c intcode.mli
ocamlopt.opt -I ../libcolibri -I ../getopt -c intcode.ml
==> ocamlc -I ../libcolibri -I ../getopt -c bitset.ml
==> ocamlc -I ../libcolibri -I ../getopt -c bitrelation.ml
--> ocamlopt.opt -I ../libcolibri -I ../getopt -c concept.mli
ocamlopt.opt -I ../libcolibri -I ../getopt -c concept.ml
ocamlopt.opt -I ../libcolibri -I ../getopt -c lattice.mli
ocamlopt.opt -I ../libcolibri -I ../getopt -c lattice.ml
ocamlopt.opt -I ../libcolibri -I ../getopt -c context.ml
ocamlopt.opt -I ../libcolibri -I ../getopt -a -o colibri.cmxa
stat.cmx bitset.cmx bitrelation.cmx intcode.cmx concept.cmx
lattice.cmx context.cmx
bitset.ml and bitrelation are already compiled to *.cmx, *.cmi, and
*.o. Because of the dependency generated by ocamldep they get
recompiled using the *byte* code compiler and thus new *.cmi files are
created as well.
This does not matter in most cases since OCaml compiles very fast. I
suspect the recompilation to cause subtle 'inconsistent assumptions
over interface' errors in conjunction with -unsave -noassert compiler
flags. However, I was not able to find a small example for this mail
that reproduces the error.
Should cmi-files depend on cmx-files when compiling for native code?
This would avoid uneccessary recompilations but would also make
integrating byte code compilation and native code compilation into one
Makefile much harder.
-- Christian
------------------------------------------------------------------------------
Christian Lindig http://www.cs.tu-bs.de/softech/people/lindig
mail: lindig@ips.cs.tu-bs.de
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