Hi, > I build CURRENT on two technically similar systems on a almost daily basis. > Therefore, it > was a great relief having WITH_META_MODE=yes set in /etc/src-env.conf for > incremental > builds. To make my understanding of this clear (just in case I'm wrong): > setting > WITH_META_MODE builds only portions that does not need to be build in the > make context.
I'm not sure I parsed that correctly, so let me just say; With MK_META_MODE=yes, bmake should be put into meta mode. This simply means that most targets get a .meta file, that records the expanded command line, any command output and a syscall trace. These can be very useful for debugging. More important; on an update build bmake can use them to make targets out-of-date that the normal rules miss. Any change to the expanded command line, makes the target out-of-date. Any change to any file read or executed makes the target out-of-date. > Well, the reason writing this email is: on one system, I run almost every > reboot into a > "full build" and this puzzles me a bit. The long-lasting and time exhausting > builds are You can add -dM to your build flags to have meta_oodate() - the function that does the above, explain why it decided the target is out-of-date. The results can be enlightening. Note, if a target rebuilds without -dM saying why - then the normal make rules decided it was out-of-date. > within the LLVM/CLANG tree. They consume a lot of time. The box in > question does have a Yes, building clang takes a while... > Well, having said this, I need to mention that both systems use almost > identical /etc/src.conf setting - except the order of appearance of > the WITH_ tags. That should not matter, bsd.mkopt.mk processes them in a specified order. > The problem: to make my point clear: the "weak" box starts compiling almost > everytime now > the LLVM/CLANG tree while the XEON box does not. This is spooky. Add -dM, and see if that tells you why. Also confirm that filemon is getting loaded after each reboot. If that comes and goes, that could cause the behavior you see. > I think there is something missing an I'd like to ask what is the suggested > way to > initially restart a full build to ensure that WITH_META_MODE gets initialised > correctly. I think Bryan has set that up so that it should take care of itself pretty well - even toggling bewteen non-meta and meta builds should DTRT - which is why it matters if filemon was used that it is there for next build. > Well, I'm not a developer, so please be patient with my naive report. No problem. Adding -dM to your build (will add a fair bit of output), will hopefully tell you what's up. >From what you describe, I'd not be surprised if you see some "a build command has changed" and it only takes a few to trigger a cascade of targets out-of-date. --sjg _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
