[ARM] Clang LTO for Kernel

[liusy58]

Hi, I saw your work https://patchwork.kernel.org/project/linux-kbuild/cover/[email protected]/ about supporting clang lto for kernel. I wonder is there any update or branch that is still on process?

[nathanchance]

That series is upstream and LTO is selectable for arm64, loongarch, riscv, and x86 but 32-bit ARM (ARCH=arm) needs some more work (likely by someone who actually cares to use it): #1627

Is that the information you were looking for?

[liusy58]

Hello, Thanks for your swift response. I try to backport this batch to alios kernel, I encounter the following error:

But I cannot find a solution to fix this. Could you please give me some guide?

The kernel source can be get by git clone https://gitee.com/anolis/cloud-kernel.git -b devel-5.10, and my LLVM version is 17.

[nickdesaulniers]

Sorry, what value of ARCH= are you using in your invocation of make?