Hi. 2017-07-09 18:05 GMT+09:00 Ingo Molnar <mingo@xxxxxxxxxx>: > > * Nicholas Piggin <npiggin@xxxxxxxxx> wrote: > >> FYI, easiest way to check if you forgot to KEEP a linker table is >> to look at `readelf -S vmlinux` differences, and to see what is >> being trimmed, look at nm differences or use --print-gc-sections >> LD option to see what symbols you're trimming. Linker tables, >> boot entry, and exception entry tends to require anchoring. > > Could you please add a debug build target to display all discarded > symbols/sections? Something like: > > make lto-check > > ... or so? > > Thanks, > > Ingo Actually, LTO activity existed some years ago (but not pulled in). http://www.spinics.net/lists/linux-kbuild/msg09242.html IIUC, this patch enables "dead code elimination", (or "garbage collection"?), but I think it is different from what is called LTO. -- Best Regards Masahiro Yamada
