Bug#939386: FTBFS with OCaml 4.08.0 (embeds .cmi in source package)

Mattia Rizzolo mattia at debian.org
Thu Sep 5 07:46:42 BST 2019


Control: forwarded -1 https://salsa.debian.org/reproducible-builds/diffoscope/issues/67

On Wed, Sep 04, 2019 at 12:56:24PM +0200, Stéphane Glondu wrote:
> The failure is due to a test that inspects a .cmi file that is shipped
> by the source package, using the "ocamlobjinfo" command. This cannot
> work.
> 
> Indeed there is no compatibility guarantee on .cmi (or any other type
> of object files) between different versions of OCaml. And this
> incompatibility is what hurts here: the .cmi shipped in the source
> package was made with OCaml < 4.08.0. The difference in version can be
> seen with the "file" command.
> 
> I have two suggestions:
> - Handle gracefully the case where ocamlobjinfo rejects an object file
>   because it was not compiled with the same version of OCaml.

We should indeed do this, like we do for haskell.

> - Instead of shipping a .cmi file in the source package, generate one
>   at build time.

That's https://salsa.debian.org/reproducible-builds/diffoscope/issues/66
and it's somewhat tricky (as the built files have to have the difference
we expect them to).

-- 
regards,
                        Mattia Rizzolo

GPG Key: 66AE 2B4A FCCF 3F52 DA18  4D18 4B04 3FCD B944 4540      .''`.
more about me:  https://mapreri.org                             : :'  :
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Debian QA page: https://qa.debian.org/developer.php?login=mattia  `-
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