Re: [RFC] Objtool toolchain proposal: -fannotate-{jump-table,noreturn}
From: Peter Zijlstra <peterz@infradead.org>
Date: 2022-09-11 15:27:11
Also in:
linux-arm-kernel, linux-toolchains, live-patching, lkml
On Fri, Sep 09, 2022 at 11:07:04AM -0700, Josh Poimboeuf wrote:
Alternatives ------------ Another idea which has been floated in the past is for objtool to read DWARF (or .eh_frame) to help it figure out the control flow. That hasn't been tried yet, but would be considerably more difficult and fragile IMO.
I though Ard played around with that a bit on ARM64. And yes, given that most toolchains consider DWARF itself best-effort, I'm not holding my breath there. On top of that, building a kernel with DWARFs on is just so much slower..