Hi Vitaly, On Mon, 2020-12-07 at 18:59 +0300, Vitaly Chikunov wrote: > Is it safe to run `eu-strip --reloc-debug-sections-only` on Linux > kernel > .debug files, such as vmlinux.debug and .ko.debug modules?
Yes, it was designed to be used on linux .ko.debug modules. vmlinux.debug itself is a special case though. It does contain relocation between debug sections, but those are not supposed to be applied and eu-strip --reloc-debug-sections will normally ignore them because vmlinux is ET_EXEC. See also this recent discussion: https://gcc.gnu.org/pipermail/gcc/2020-December/234392.html > It's really reduces size significantly. Description for .ko in > PR#24344 looks good (that it strips linking information that does not > needed for the kernel, but effect for vmlinux.debug in unstated), vmlinux itself needs to be handled slightly differently, see the thread above. But I don't fully understand the effect of --emit-relocs -- discard-none ld options that the x86_64 kernel uses (it might be different for other arches). > but, I > want to be extra sure it's safe to add to our (ALT Linux) packaging > system for -debuginfo rpms. Upstream rpm comes with find-debuginfo.sh which takes an -r option. The -r flag says to use eu-strip --reloc-debug-sections. Which the fedora kernel.spec uses. Cheers, Mark
