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<?xml version="1.0"?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"/usr/share/sgml/docbook/dtd/xml/4.4/docbookx.dtd" [
<!ENTITY % included SYSTEM "included.ent">
%included;
]>
<section>
<title>Building packages with debhelper tools and dh-ocaml</title>
<para>
The availability of the native compiler can be tested in the
<filename>debian/rules</filename> file by testing the
possibility of executing
<filename>/usr/bin/ocamlopt</filename>, and build the bytecode
version or the native version of the program according to the
result of the test. This is a sample snippet of
<filename>debian/rules</filename> doing so:
<programlisting>
build-stamp:
dh_testdir
if [ -x /usr/bin/ocamlopt ]; then \
$(MAKE) opt; \
else \
$(MAKE) all; \
fi
</programlisting>
</para>
<para>The following is a snippet of a sample
<filename>debian/control</filename>:
<programlisting>
Package: spamoracle-byte
Architecture: all
Depends: ocaml-base-${F:OCamlABI}
Provides: spamoracle
Conflicts: spamoracle
Replaces: spamoracle
</programlisting>
</para>
<para>The following its pairing <filename>debian/rules</filename> snippet:
<programlisting>
OCAMLABI := $(shell ocamlc -version)
...
binary-indep: build install
dh_gencontrol -i -- -VF:OCamlABI="$(OCAMLABI)"
</programlisting>
</para>
<para>
In the case where there is only one package, which provides
either a native version where available or a bytecode version
otherwise, the dependency on
<varname>ocaml-base-&ocaml-version;</varname> should be
added only when the package is built in native mode. For
example, the <filename>debian/control</filename> of
<filename>approx</filename> contains:
<programlisting>
Package: approx
Architecture: any
Depends: ${shlibs:Depends}, ${F:OCamlRun}, adduser, bzip2, curl
</programlisting>
and the corresponding <filename>debian/rules</filename> contains:
<programlisting>
OCAMLABI = $(shell ocamlc -version)
BYTECODE = $(shell [ -x /usr/bin/ocamlopt ] || echo yes)
OCAMLRUN = $(if $(BYTECODE),ocaml-base-$(OCAMLABI))
...
binary-arch:
...
dh_gencontrol -- -VF:OCamlRun="$(OCAMLRUN)"
</programlisting>
</para>
<para>TODO: section should be simlified by using dh-ocaml</para>
</section>
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