> There's the series from Andi Kleen that enables LTO for Linux on x86: > https://lwn.net/Articles/512548/ > https://github.com/andikleen/linux-misc/tree/lto-411-1 > > It has solved many problems you also try to solve, and some patches > are looking very similar. > > At now we have different patchsets for gcc and clang, and it would be > better to have them together. One thing I'm worried is that you introduce > CONFIG_CLANG_LTO and use it for all cases, including that where more > generic CONFIG_LTO should be used.
Yes would be good to merge the two. I've been looking at updating my old one. I don't cover any ARM code, but lots of generic code. My patches also worked on MIPS at least. There's also older patches to enable single-pass-linking for kallsyms, which is extremly useful for LTO build performance. -Andi
