[PATCH] drivers: fix symbol exports when map is omitted

[David Marchand]

On Tue, Nov 29, 2022 at 7:23 PM Ferruh Yigit <ferruh.yigit at amd.com> wrote:
>
> On 11/29/2022 2:00 PM, David Marchand wrote:
> > ld exports any global symbol by default if no version script is passed.
> > As a consequence, the incriminated change let any public symbol leak
> > out of the driver shared libraries.
> >
> > Hide again those symbols by providing a default map file which
> > unexports any global symbol using a local: * catchall statement.
> >
>
> I assume this will cause warnings for ABI check scripts, how can we
> prevent the warnings?

Indeed.

Some options:
- add exhaustive suppression rules in devtools/libabigail.abignore,
- retag the v22.11 release with this fix, but we already announced it
and people started downloading the tarball,
- release a .1 version and compare ABI against it (either in the main
repo, or in the 22.11 stable branch, through for the ABI check in GHA,
it would be simpler to have the tag in the main repo..),

Do you have other ideas?


>
> > The check on symbols is skipped for this default map file as it is
> > intentionnally an empty map (see commit b67bdda86cd4 ("devtools: catch
> > empty symbol maps")) and there is nothing to check in it.
> >
>
> How it is skipped, './devtools/check-symbol-maps.sh' still complains
> about 'drivers/version.map' for me.

I had considered the call check-symbols.sh during build.
But it is true that if you call check-symbol-maps.sh alone, we will
get a warning.

I will exclude it in v2.


>
> > While at it, move Windows specific objects where needed for better
> > readability.
> >
>
> +1
>
> > Fixes: 7dde9c844a37 ("drivers: omit symbol map when unneeded")
> > Cc: stable at dpdk.org
> >
> > Reported-by: Luca Boccassi <luca.boccassi at microsoft.com>
> > Signed-off-by: David Marchand <david.marchand at redhat.com>
>
>
> Not tested on Windows, but for Linux:
> Tested-by: Ferruh Yigit <ferruh.yigit at amd.com>

UNH Windows tests look fine.


-- 
David Marchand