On Fri, Mar 5, 2021 at 4:13 AM Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Thu, Mar 4, 2021 at 7:36 AM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote: > > > > All the kernel-space objects are rebuilt > > when the compiler is upgraded. > > I very much NAK'ed that one. Why did that go in? When the compiler is upgraded, all objects should be rebuilt by the new compiler, - this keeps Kbuild deterministic, irrespective of whether it is a fresh build, or incremental build. If we do not force the full rebuild, the banner at boot time is no point. [ 0.000000] Linux version 5.8.0-44-generic (buildd@lgw01-amd64-039) (gcc (Ubuntu 10.2.0-13ubuntu1) 10.2.0, GNU ld (GNU Binutils for Ubuntu) 2.35.1) #50-Ubuntu SMP Tue Feb 9 06:29:41 UTC 2021 (Ubuntu 5.8.0-44.50-generic 5.8.18) It claims it was built by gcc (Ubuntu 10.2.0-13ubuntu1) 10.2.0 but we would never know if it is true for whole objects. Some of them might have been compiled by an older compiler. > Or maybe I NAK'ed another version of it (I think the one I NAK'ed was > from Josh), and didn't realize that there were multiple ones. > > > Linus complaint about GCC plugins not being rebuilt. > > Yes, and that was a separate complaint and not at all tied to the other objects. > > Gcc plugins aren't kernel object files at all. They are very much like > dynamically loadable libraries to gcc itself. > > Linus -- Best Regards Masahiro Yamada
