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)
[off-list ref] wrote:

On 11/13/21 14:02, Mickaël Salaün wrote:

quoted

quoted

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@linux-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