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Date: Sun, 14 Nov 2021 16:32:02 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
Al Viro <viro@...iv.linux.org.uk>, Andrew Morton <akpm@...ux-foundation.org>,
Aleksa Sarai <cyphar@...har.com>, Andy Lutomirski <luto@...nel.org>, Arnd Bergmann <arnd@...db.de>,
Casey Schaufler <casey@...aufler-ca.com>, Christian Brauner <christian.brauner@...ntu.com>,
Christian Heimes <christian@...hon.org>, Deven Bowers <deven.desai@...ux.microsoft.com>,
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Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
"Madhavan T . Venkataraman" <madvenka@...ux.microsoft.com>, Matthew Garrett <mjg59@...gle.com>,
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Thibaut Sautereau <thibaut.sautereau@....gouv.fr>,
Vincent Strubel <vincent.strubel@....gouv.fr>, Yin Fengwei <fengwei.yin@...el.com>,
kernel-hardening@...ts.openwall.com, Linux API <linux-api@...r.kernel.org>,
Linux FS Devel <linux-fsdevel@...r.kernel.org>,
linux-integrity <linux-integrity@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-security-module <linux-security-module@...r.kernel.org>,
Mickaël Salaün <mic@...ux.microsoft.com>
Subject: Re: [PATCH v16 1/3] fs: Add trusted_for(2) syscall implementation and
related sysctl
Hi Alejandro,
On Sat, Nov 13, 2021 at 8:56 PM Alejandro Colomar (man-pages)
<alx.manpages@...il.com> wrote:
> On 11/13/21 14:02, Mickaël Salaün wrote:
> >> TL;DR:
> >>
> >> ISO C specifies that for the following code:
> >>
> >> enum foo {BAR};
> >>
> >> enum foo foobar;
> >>
> >> typeof(foo) shall be int
> >> typeof(foobar) is implementation-defined
> >
> > I tested with some version of GCC (from 4.9 to 11) and clang (10 and 11)
> > with different optimizations and the related sizes are at least the same
> > as for the int type.
>
> GCC has -fshort-enums to make enum types be as short as possible. I
> expected -Os to turn this on, since it saves space, but it doesn't.
Changing optimization level must not change the ABI, else debugging
would become even more of a nightmare.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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