On 01/11/2016 00:27, John Covici wrote: > On Mon, 31 Oct 2016 18:06:07 -0400, > Alan McKinnon wrote: >> >> On 31/10/2016 23:57, John Covici wrote: >>> On Mon, 31 Oct 2016 13:37:50 -0400, >>> [email protected] wrote: >>>> >>>> Dale <[email protected]> [16-10-31 18:36]: >>>>> [email protected] wrote: >>>>>> Hi, >>>>>> >>>>>> from ancient times ;) I remember, that it is not advisable >>>>>> to compile a linux kernel with more than one cpu core. >>>>>> >>>>>> Is that still true, or is it save to compile it with >>>>>> "all you can eat" ::)) ? >>>>>> >>>>>> Cheers >>>>>> Meino >>>>>> >>>>>> >>>>> >>>>> While I don't upgrade my kernel very often, since I don't reboot often >>>>> either, I've used -j 6 for my 4 core CPU for a long time. I'm pretty >>>>> sure I've done that ever since I built this rig. So far, no problems >>>>> that I have seen. >>>>> >>>>> Dale >>>>> >>>>> :-) :-) >>>>> >>>> >>>> Great! Currently rebuilding the kernel with '-j7 ' :) >>> >>> I wonder, how does it make sure that a dependency is always compiled >>> before what depends on it, so the link and all that works? >>> >> >> The kernel is special - it's a completely self-contained body of code >> with no external dependencies, so it is internally consistency almost as >> a matter of course. >> >> As for compiling the right things in the right order, the Makefiles take >> care of that just like all other software with a build system. How does >> the Makefile get made? Well, when you do make <something>config, you see >> all those deps like how iwlwifi depends on 80211 which depends on >> networking etc. That tells you the order things must be built in. Shove >> that into a Makefile maker, and voila, Bob's your auntie. Build issues >> tends to get fixed during the dev period so when Linux releases a kernel >> there's an excellent chance it will build correctly. >> >> FWIW, none of this is a specially difficult problem. It's the kind of >> thing I'd expect bright CS students to be able to do at the end of the >> first year > > OK, I will maybe try something, but I have had gentoo problems only > solved by -j1 due to such things, I guess. >
With the kernel? Very very highly unlikely. If you had that problem, there is something wrong with your setup and I'd be very reluctant jump at the kernel Makefiles being the problem. Now if you said you had that problem with libreoffice, I'd agree 100%. The kernel? No. and btw, emerge problems that are solved using -j1 are a) not gentoo problems at all b) neither are they compiler problems c) they are always build problems caused by the package's own shitty build system and by upstream devs that never heard of this idea called "test your stuff to make sure it works in the real world" -- Alan McKinnon [email protected]
