Sophie: ocaml-findlib-devel-1.2.4-5mdv2010.1 x86

ocaml-findlib-devel-1.2.4-5mdv2010.1.x86_64.rpm

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>Chapter 7. FAQs</H1
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>Does findlib support the autolink feature of O'Caml 3?</A
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>Why does findlib not automatically include the -custom option if
linked with C code?</A
></DT
><DT
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>Does findlib support linking of applications as well as
packages?</A
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>Does Findlib support camlp4?</A
></DT
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>Why do some people install the .cmx files?</A
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>Does findlib support the autolink feature of O'Caml 3?</A
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> Findlib is compatible with autolink</P
><P
>The new archive format introduced with O'Caml 3 can store the linker options
that are necessary to link an archive. For example:

<PRE
CLASS="PROGRAMLISTING"
>ocamlc -a -o myarchive.cma mymodule.cmo -cclib -lmylibrary</PRE
>

This command does not only create the new archive
<TT
CLASS="LITERAL"
>myarchive.cma</TT
>, but it also writes into a special section of
that file that the linker option <TT
CLASS="LITERAL"
>-cclib -lmylibrary</TT
> is
necessary to link this archive.</P
><P
>This means for findlib that most of the "linkopts" attributes in META files
have become superflous: The compiler itself already knows the linker options,
we do not need to tell the compiler the options. We could simply leave all
"linkopts" attributes out.</P
><P
>Of course, the "linkopts" feature of findlib still works. This is necessary
because findlib should keep the compatibility with older software, and because
"linkopts" is more powerful (you can have conditional linker options).</P
><P
>If you have software that must run in both O'Caml 2 and O'Caml 3 environments,
you can make your "linkopts" attribute dependent on the "autolink"
predicate. For example:

<PRE
CLASS="PROGRAMLISTING"
>linkopts = "-cclib -lmylibrary"
linkopts(autolink) = ""</PRE
>

The findlib installation for O'Caml 3 will take the second line which is
reasonable because ocamlc already knows how to link; the installation for
O'Caml 2 never sets the "autolink" predicate and therefore uses the first line.</P
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