Bug#1029448: alire in Debian; dependencies of the package

[Stephane Carrez <Stephane.Carrez@vacs.fr>]

Hi Ludovic,

On 23/01/2023 19:51, Ludovic Brenta wrote:
> Here is what I get with dpkg --info alire_1.2.1-2_amd64.deb after building it:
>
>   new Debian package, version 2.0.
>   size 3434464 bytes: control archive=1560 bytes.
>       476 bytes,    13 lines      control
>      2386 bytes,    35 lines      md5sums
>   Package: alire
>   Version: 1.2.1-2
>   Architecture: amd64
>   Maintainer: Stephane Carrez <Stephane.Carrez@gmail.com>
>   Installed-Size: 17740
>   Depends: libc6 (>= 2.35)
>   Section: devel
>   Priority: optional
>   Homepage: https://github.com/alire-project
>   Description: Ada package manager.
>    A catalog of ready-to-use Ada libraries plus a command-line tool
>    (`alr`) to obtain, build, and incorporate them into your own projects.
>    It aims to fulfill a similar role to Rust's `cargo` or OCaml's `opam`.
>
> As you can see, it does not depend on libgnat-12 and does not even recommend gnat.  This
> seems suspicious to me.  Could you please check that the dependencies are generated
> correctly?

Yes, I think this comes from the way they build Alire by default to reduce dependencies
on the GNAT compiler and other shared libraries.

$ ldd bin/alr
        linux-vdso.so.1 (0x00007ffc555ed000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f152fe1f000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f1531205000)

By not depending on the GNAT compiler installed, you can use Alire with several newer
or older compiler as you wish.

I think this comes from the definition in alire_common.gpr:

   package Binder is
      for Switches ("Ada") use ("-Es", "-g", "-static");
   end Binder;