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Langue: en

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Version: 2009-11-01 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)


dh_ocaml - calculates OCaml packages dependencies and provides


dh_ocaml [debhelper options]


dh_ocaml is a debhelper program that is responsible for filling the ${ocaml:Provides} and ${ocaml:Depends} substitutions and adding them to substvars files.

dh_ocaml acts on three kinds of binary packages: those shipping development part of OCaml libraries (usually named libXXX-ocaml-dev or libXXXX-camlp4-dev), those shipping runtime for OCaml libraires (e.g. plugin and shared library, usually named libXXX-ocaml or libXXXX-camlp4) and those shipping OCaml bytecode non-custom executables (i.e. executables interpreted by /usr/bin/ocamlrun).

On specific package the convention is XXX for development and XXX-base for runtime (e.g. ocaml-nox and ocaml-base-nox).

On OCaml library packages dh_ocaml will firstly look at OCaml objects shipped by the package. Then, dh_ocaml uses appropriate program on them for collecting information about OCaml modules defined and used by them. Information about defined units will be used to automatically create the OCaml md5sums registry entry for development and runtime package, e.g. /var/lib/ocaml/md5sums/libXXX-ocaml-dev.md5sums. Information about imported units will instead be used as keys in the OCaml md5sums registry for retrieving dependency information for the package. Those information will then be used to fill the ${ocaml:Depends} substvars. They will also be used to fill the ${ocaml:Provides} substvar which will be replaced by a name of the form libXXX-ocaml-dev-NNNN, where NNNN is an checksum computed from the interfaces of the modules provided by the library.

*.cm[aio] are processed by ocamlobjinfo;
*.cmxa? are processed by ocamldumpapprox;
*.cmxs are processed by ocamlplugininfo;
executable are processed by ocamlbyteinfo, if possible.

Dependencies extracted from the system md5sum registry, dh_ocaml will add in ${ocaml:Depends}:

dependency from libXXX-ocaml-dev to libXXX-ocaml (runtime part of the library), if there is a libXXX-ocaml package in debian/control;
dependency from libXXX-ocaml-dev to the appropriate libYYYY-ocaml-dev-NNNN packages;
dependency from libXXX-ocaml to the appropriate libYYYY-ocaml-NNNN packages.
dependency from XXXX to the appropriate libYYYY-ocaml-NNNN packages.

For runtime package ${ocaml:Provides} will be set libXXXX-ocaml-NNNN and for development package to libXXX-ocaml-dev-NNNN.

The same kind of relations are established between libXXXX-camlp4 and libXXXX-camlp4-dev packages.


--checksum str
Checksum are automatically computed from exported interface by the dev/runtime package. This checksum can only show a partial information about the interface. In this case the checksum computation can be replaced by another string which gives more information about dependencies.

Typically, ocaml-nox/ocaml-base-nox package doesn't use a computed checksum but the version of OCaml.

--nodefined-map dev1:unit1,unit2,...
Ignore some exported unit of package/runtime dev1. This option should be used with care. It is a very special case, when one library ship a drop-in replacement for another library. Most of the time if one library ship the same unit it should be considered as an error.

This option can be repeated as much as needed to define ignore for all development packages.

--runtime-map dev1:runtime1,dev2:runtime2,...
The association between development part of libraries and their runtimes is guessed by dh_ocaml according to the OCaml packaging policy. Thus, libXXX-ocaml-dev is the name of the package shipping the development part of XXX library while libXXX-ocaml, if any, is the name of the package shipping the corresponding runtime. libXXXX-camlp4-dev and libXXXX-camlp4 packages are handled the same way.

Using --runtime-map you could override the pairs development package name, runtime package name. The value passed to --runtime-map admits no spaces and must be a comma separated list of items. Each item can be a single package name (stating that that name corresponds to the development part of a library) or two package names separated by a colon (stating that the first corresponds to the development part of a library, while the second to its accompanying runtime part).

Every package that doesn't follow libXXX-ocaml-dev/libXXX-ocaml, libXXXX-camlp4-dev/libXXXX-camlp4 or which is not defined in the runtime map are considered to be binary package and will be searched only for bytecode.


debian/libXXX-ocaml-dev.olist debian/libXXX-camlp4-dev.olist
By default, the list of OCaml objects or bytecode binaries shipped by your package which should be analyzed for retrieving dependency information is guessed by dh_ocaml.

This file permit to specify a file which lists, one per line, that OCaml objects or bytecode binaries. Objects should be in one of the format understandable by ocamlobjinfo, ocamldumpapprox, ocamlplugininfo or ocamlbyteinfo. Files are considered relative to the package build directory.


Debian policy, version 3.7.2

OCaml packaging policy, version 1.0.0


ocamlobjinfo(1), ocamlbyteinfo(1), ocamldumpapprox, ocamlplugininfo, debhelper(7), ocaml-md5sums(1)

This program is a part of debhelper.


Stefano Zacchiroli <>, Samuel Mimram <>, Mehdi Dogguy <>, Sylvain Le Gall <>
Notre devoir, pour leur bien et pour le bien de Linux, est de te
flinguer avant que tu ne les sacrifies (fût-ce avec les meilleures
intentions du monde).
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