Re: Debian Policy for Ada, Second Edition

[Ludovic Brenta <ludovic@ludovic-brenta.org>]

Pascal Obry <pascal@obry.net> writes:
> Ludovic Brenta a écrit :
>
>> I am not aware of a GNAT default.  What is the default? And why does
>> it not follow the GNAE?
>
> To be able to install a compiler in its own directory and to be able to
> have multiple compilers installed at the same time.
>
> The scheme is something like:
>
> /opt/GNAT/<ver>
>   /bin                 <- binaries there
>   /lib/gnat/           <- project files there (GNAT looks there)
>   /lib/gnat/<project>  <- if needed sub-project files
>   /lib/<project>       <- .o .ali .a .so for <project>
>   /lib                 <- sym links to .a and .so above
>   /include/<project>   <- .ads/.adb for <project>
>   /share/doc/<project> <- documentation
>   /share/gps/plug-ins  <- .xml for GPS customization (doc, tools)
>
>
>> Maybe symlinks can come to the rescue to provide interoperability.
>
> That will be lot of them and you won't be able to support multiple
> compilers. But maybe this is not a requirement for Debian.

Indeed, the policy states clearly that exactly one compiler is
supported in Debian, so that all packages are ABI compatible.

The default project path is a new feature of GNAT that I was unaware
of; thanks for pointing it out to me.

I see that I can change the default by patching
src/gcc/ada/Make-lang.in, which generates build/gcc/ada/sdefault.adb.
I think I'll do that, thus making the symlinks unnecessary, and
allowing GNAT to find all libraries' project files automatically.

Objections?

-- 
Ludovic Brenta.