Hello,
This is consistent with how ocamlc/ocamlopt work: separate compilation
is ensured the way you think by bytecode .cmo compilation: to build a
module, you only need the *interfaces* of its dependencies, but it is
unfortunately not ensured when compiling to native code, because of the
global (inter-modules) optimizations performed (inlining AFAIK). Thus,
to build a .cmx module, you need to be aware of the actual *code* of its
dependencies.
I wonder now if it would be theoretically possible to do these
optimization, not at compile-time, but delay them until link-time, when
the code is fully known...
Cheers,
-m
Le 03/13/2012 07:19 PM, Matej Košík a écrit :
Hi,
The "ocamldep" tool generates Makefile dependencies for both situations:
- when we use "ocamlc"
- as well as when we use "ocamlopt"
Dependencies, generated for "*.cmo" files,
are corresponding "*.cmi" files.
This is not surprising.
However, dependencies, generated for "*.cmx" files,
are always other "*.cmx" files.
This is surprising.
Why "*.cmx" files do not depend on "*.cmi" files?
I have noticed this in a bigger project but this phenomenon appear to
happen for arbitrarily small projects.
Consider the following ocamldep-generated couple of rules:
src/ml2c/typing/printtyp.cmo: src/ml2c/typing/types.cmi \
src/ml2c/typing/primitive.cmi src/ml2c/typing/predef.cmi \
src/ml2c/typing/path.cmi src/ml2c/typing/outcometree.cmi \
src/ml2c/typing/oprint.cmi src/ml2c/utils/misc.cmi \
src/ml2c/parsing/longident.cmi src/ml2c/typing/ident.cmi \
src/ml2c/typing/env.cmi src/ml2c/typing/ctype.cmi \
src/ml2c/utils/clflags.cmi src/ml2c/typing/btype.cmi \
src/ml2c/parsing/asttypes.cmi src/ml2c/typing/printtyp.cmi
src/ml2c/typing/printtyp.cmx: src/ml2c/typing/types.cmx \
src/ml2c/typing/primitive.cmx src/ml2c/typing/predef.cmx \
src/ml2c/typing/path.cmx src/ml2c/typing/outcometree.cmx \
src/ml2c/typing/oprint.cmx src/ml2c/utils/misc.cmx \
src/ml2c/parsing/longident.cmx src/ml2c/typing/ident.cmx \
src/ml2c/typing/env.cmx src/ml2c/typing/ctype.cmx \
src/ml2c/utils/clflags.cmx src/ml2c/typing/btype.cmx \
src/ml2c/parsing/asttypes.cmx src/ml2c/typing/printtyp.cmi
The second rule seems to be unnecessarily demanding (unless it makes no
sense to compile *.cmi files if we use ocamlopt). It should read:
src/ml2c/typing/printtyp.cmx: src/ml2c/typing/types.cmi \
src/ml2c/typing/primitive.cmi src/ml2c/typing/predef.cmi \
src/ml2c/typing/path.cmi src/ml2c/typing/outcometree.cmi \
src/ml2c/typing/oprint.cmi src/ml2c/utils/misc.cmi \
src/ml2c/parsing/longident.cmi src/ml2c/typing/ident.cmi \
src/ml2c/typing/env.cmi src/ml2c/typing/ctype.cmi \
src/ml2c/utils/clflags.cmi src/ml2c/typing/btype.cmi \
src/ml2c/parsing/asttypes.cmi src/ml2c/typing/printtyp.cmi
Shouldn't it?
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