From: Richard Biener <richard.guenther@gmail.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: gcc@gcc.gnu.org
Subject: Re: Using __gnu_lto_slim to detect -fno-fat-lto-objects
Date: Wed, 22 Feb 2023 09:23:45 +0100 [thread overview]
Message-ID: <CAFiYyc0fvEbNMsORRaC7U-WufSR8jRkd=776nm-Hp0CtN+=SUA@mail.gmail.com> (raw)
In-Reply-To: <87a616un8q.fsf@oldenburg.str.redhat.com>
On Wed, Feb 22, 2023 at 9:19 AM Florian Weimer via Gcc <gcc@gcc.gnu.org> wrote:
>
> Can we use the COMMON symbol __gnu_lto_slim to detect
> -fno-fat-lto-objects on contemporary GNU/Linux (with the LTO linker
> plugin)?
Yes.
> We currently build the distribution with -ffat-lto-objects, and I want
> to switch away from that. Packages will need to opt in to
> -ffat-lto-objects if static objects they build escape the buildroot.
> And to make sure that this opt-in happens, I want to fail the build if
> there would be any -fno-fat-lto-objects objects leaking.
For SUSE we're checking that no LTO bytecode leaks instead, thus we check
for __gnu_lto_v? (I think). The reason is that even for static libraries
we do not want to ship LTO bytecode.
Richard.
> Thanks,
> Florian
>
next prev parent reply other threads:[~2023-02-22 8:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-22 8:18 Florian Weimer
2023-02-22 8:23 ` Richard Biener [this message]
2023-02-22 8:28 ` Florian Weimer
2023-02-22 8:58 ` Richard Biener
2023-02-23 9:53 ` Martin Liška
2023-03-02 23:57 ` Jeff Law
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