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From: Thomas Monjalon <>
To: Bruce Richardson <>
Cc:, Tyler Retzlaff <>,
Subject: Re: [PATCH] build: fix linker warnings about undefined symbols
Date: Sun, 18 Feb 2024 18:38:22 +0100	[thread overview]
Message-ID: <6824308.6fTUFtlzNn@thomas> (raw)
In-Reply-To: <>

10/01/2024 17:58, Tyler Retzlaff:
> On Wed, Jan 10, 2024 at 03:01:03PM +0000, Bruce Richardson wrote:
> > The default behaviour of "ld.lld" has changed, so it now prints out
> > warnings about entries in the file which don't exist in
> > the current build. Since we use our file simply to filter
> > out the functions we don't want made public, we include in it all
> > functions across all OS's and builds that we want public if present.
> > This causes these ld warnings to be emitted, e.g. on BSD, which is
> > missing functionality found on Linux. For example:
> > 
> > * hpet functions in EAL
> > * regexdev enqueue and dequeue burst
> > * eventdev event_timer functions
> > 
> > Easiest solution, without major rework of how we use our
> > files, and without dynamically generating them per-build, is to pass
> > the --undefined-version flag to the linker, to restore the old
> > behaviour.
> > 
> > Signed-off-by: Bruce Richardson <>
> Acked-by: Tyler Retzlaff <>

+Cc stable

Applied as easy solution for this linker.

The discussion about Windows linker and use of macros
deserve to continue, maybe in a new dedicated thread?

> i don't know if has ever been discussed but a way to achieve a similar
> outcome would be to introduce a visibility macro allowing the data and
> function symbols to be explicitly made visible while making the build
> default hidden.
> on windows symbols are hidden by default (opposite of gnu toolchain) and
> allowing the symbols that are intended to be public be annotated in code
> with a macro instead of a separate map/def file would arguably appear
> more consistent.  additionally, the current process of converting a map
> file to a def file for windows has limitations with respect to things
> like marking the type of symbol being exported.

       reply	other threads:[~2024-02-18 17:38 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
     [not found] ` <>
2024-02-18 17:38   ` Thomas Monjalon [this message]
2024-02-20 17:02     ` Tyler Retzlaff

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