On Sat, Jan 27, 2018 at 01:15:49AM +0100, Arnd Bergmann wrote: > On Mon, Nov 27, 2017 at 10:34 PM, Andi Kleen <a...@firstfloor.org> wrote: > > From: Andi Kleen <a...@linux.intel.com> > > - Add a new LDFINAL variable that controls the final link > > for vmlinux or module. In this case we call gcc-ld instead > > of ld, to run the LTO step. > > When I tried this out on allmodconfig (following the lwn article), I ran into > a number of warnings:
Thanks for testing. Yes it's a known issue: during one module build when modpost looks at the file it is still in LTO format, and modpost doesn't understand the LTO symbol table. I had a patch to teach it to it at some point, but it got lost somewhere. The LLVM LTO patchkit has a different solution that actually fixes the sequence to run modpost only after a LTO final link, but I haven't gotten around to port that one. It seems to work already for the single file modules. -Andi
