[PATCH v2] lib/Kconfig.debug: Add check for non-constant .{s,u}leb128 support to DWARF5

[Nathan Chancellor]

Hi Andrew,

On Sun, Oct 16, 2022 at 05:28:15PM -0700, Andrew Morton wrote:
> On Fri, 14 Oct 2022 13:42:11 -0700 Nathan Chancellor <nathan at kernel.org> wrote:
> 
> > When building with a RISC-V kernel with DWARF5 debug info using clang
> > and the GNU assembler, several instances of the following error appear:
> > 
> >   /tmp/vgettimeofday-48aa35.s:2963: Error: non-constant .uleb128 is not supported
> 
> hm, which kernels want this?
> 
> I could merge it for 6.1, which seems suitable.  If we want it
> backported into earlier kernels then a Fixes: would be nice, to prevent
> it from being ported back further than necessary.

Masahiro took this for 6.1 via the kbuild tree, it is now in mainline as
commit 0a6de78cff60 ("lib/Kconfig.debug: Add check for non-constant
.{s,u}leb128 support to DWARF5"). It does need to go to stable but it
needs a few prerequisite changes to cover all cases and I did not want
to try and describe those dependencies in the patch itself. I should be
able to handle the backports manually tomorrow.

Cheers,
Nathan