Le vendredi 26 février 2010 06:57:54, Pierre Letouzey a écrit :
> On Tue, Feb 23, 2010 at 09:10:27PM +0000, Richard Jones wrote:
> >
> > It would be great if Debian could push changes for cross-compilation
> > back upstream. Perhaps this is something we will be able to discuss
> > at the OCaml Users Conference in April?
> >
>
> Yes, that would be nice...
Agreed. But some of them need to be made more generic before..
> >
> > In Fedora we maintain over 100 mingw32-* packages (not OCaml
> > specifically, but many C and C++ libraries), and there are often quite
> > a lot of changes from upstream and from the native package.
>
> Indeed, I should have started looking in this direction. In particular
> I've now found your mingw32-ocaml-lablgtk.spec, but in fact after
> having made my own mingw32-lablgtk2*.deb. I should try to factorize
> the two someday.
>
> > > Yes, this can be an issue. In general, I recommend to set the PATH with
> > > the cross-compiler binaries first:
> > > export PATH=/usr/i586-mingw32msvc/bin:$PATH
> >
> >
> > Oooo, I don't like this at all. This is not necessary for any Fedora
> > cross-compiled packages, so I'm not clear why it should be needed for
> > Debian ones.
> >
>
> As I said earlier I indeed think this export PATH should (and can) be
> avoided as much as possible.
Agreed. The problem comes from some build systems that hardcode ocaml compiler
or use `which ocamlc`
> So anyway, here's the current status of my effort to cross-compile Coq:
>
> - With the help of Stephane Glondu, we now have debian packages for
> mingw32-{camlp5,gtk2,lablgtk2}, see http://debian.glondu.net/mingw32
>
> - With these packages, my initial goal is fulfilled: I'm able to
> compile the native opt win32 binaries for coq (including gtk gui
> coqide) while comfortably seated in front of my linux box. I've even
> prepared a windows installer by re-using a nsis script of someone of
> our group. I still have to thoroughly test these binaries, but
> initial tests look ok :-)
>
> - My mingw32-gtk2 package is a "fake", I was too lazy to properly
> adapt gtk2 and its dependencies. I think that even with indications
> coming from the fedora mingw32-*.spec, this is a non-trivial task.
> Instead, this .deb repacks an official gtk+-bundle-2.8.17*-win32.zip
> coming from ftp.gnome.org.
>
> - My mingw32-lablgtk2 is quite stripped-down: only gtk, no extensions
> such as glade, sourceview, gnome-ui or whatever. Moreover it only
> contains the "opt" files. Concerning byte version, the build fails
> on ocamlc (and hence ocamlrun) trying to load a .so while a .dll has
> been produced. To reproduce the issue, simply replace "lablgtkopt"
> with "all" in debian/rules. Since I'm focused on getting native .exe
> binaries, I've gladly ignored this :-) ...
>
> - But I've nonetheless spent some time trying to understand what's
> going on. And I got the feeling that current ocamlrun and ocamlc
> from mingw32-ocaml aren't really emulating a mingw32 environment.
> For instance:
>
> echo "print_string Sys.os_type" >> test.ml
> /usr/i586-mingw32msvc/ocamlc -o test test.ml
> ./test # answers Unix
I believe bytecode compilation is plateform independant. Hence, when you run
the test with your own ocamlrun, it returns Unix.
This may also be the case with the shipped ocamlrun, but the bytecode should
still be executable under windows.
> Similarly:
>
> /usr/i586-mingw32msvc/ocamlmktop -o mytop
> ./mytop
> print_string Sys.os_type;; (* answers Unix *)
> [Btw this ocamlmktop isn't working out-of-the-box, since
> toplevellib.cma isn't installed by mingw32-ocaml.]
This is more an issue. Should I patch the package to include toplevellib.cma ?
Shouldn't the result of mktop be a binary for windows ?
> So, are these ocamlrun/ocamlc/ocamlmktop meant to have different
> behavior than the /usr/bin/ ones ? If this is not the case, maybe
> they could simply be removed from the package...
I do not want to remove ocamlrun from the package. These binaries are ABI
dependant with the version of ocaml. For instance, when I had ocaml 3.11.2 as
main ocaml and ocaml 3.11.1 as cross-build ocaml, compilation would fail with
the cross-compiler because the ocamlrun used was the one from 3.11.2 and it
was not ABI compatible with 3.11.1.
For this reason, the package now ships its own ocamlrun in order to be
independant as much as possible from the "normal" ocaml.
> When looking at the build process of ocamlrun, I first noticed that
> byterun/libcamlrun.a was not remade after switching to the mingw
> config/Makefile. But then I realized that ocamlrun itself was not
> a remade one, otherwise we would have had a ocamlrun.exe. Which
> by the way would be handy to create -custom win32 byte .exe...
> Not that I care much about byte when opt is working, but that
> might interest some other persons.
I believe there should be more work to do with byterun compilation, indeed..
Romain
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