[CAULDRON] Topics for the Toolchain and Linux kernel BoF

[Xi Ruoyao]

On Mon, 2024-09-23 at 08:02 +0100, Sam James wrote:
> Xi Ruoyao <xry111@xry111.site> writes:
> 
> > On Thu, 2024-09-12 at 18:13 +0200, Jose E. Marchesi wrote:
> > > - "noreturn" and jump tables run-time hints
> > > 
> > >   It has been expressed on the kernel side the desire of having the C compiler
> > >   emit run-time hints marking functions that are not supposed to return and
> > >   also to provide annotations on jump tables.  This is for the benefit of
> > >   objtool in arm64, see references below.
> > > 
> > >   Goal of the discussion:
> > > 
> > >   Collect and assess the requirements of these features, discuss their
> > >   pertinence and the way it could be best implemented.  The outcome of the
> > >   discussion will then be used to continue the discussion with the clang/llvm
> > >   and kernel hackers at LPC.
> > > 
> > >   References:
> > >   https://lore.kernel.org/linux-arm-kernel/YyLmhUxTUaNzaieC@hirez.programming.kicks-ass.net/
> > 
> > FWIW we are having very similar issues for using objtool in loongarch. 
> > And we also hit a similar issue with table-based computed goto.  I'm not
> > sure if the computed goto is an issue for arm64 either.
> 
> I brought it up briefly on your behalf.
> 
> > 
> > Some related materials:
> > 
> > - https://gcc.gnu.org/PR82365#c13
> > - https://gcc.gnu.org/PR116483
> > - https://gcc.gnu.org/pipermail/gcc-patches/2024-July/657641.html
> > (Nacked off-line)

Is there's something conclusive from the meeting?  I was busy on
$RANDOM_MESSY_THINGS last week and had not noticed it before.

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University