Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 12 Mar 1996 09:25:44 +0300 (GMT+0300) | From | "Vadim E. Kogan" <> | Subject | Re: Space, speed etc... |
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On Mon, 11 Mar 1996, Jim Nance wrote:
> > 2. Speed - `make dep` > > > > a. Tell me please why it's needed? > > Strictly speaking, its not needed if you only want to compile the kernel once, > and never change your configuration. You have to fool the top level Makefile > into thinking its already been run though. Something like this should work: > > cd /usr/src/linux > cat /dev/null >.depends > cat /dev/null >.hdepends > make zImage > > If you want to modify files, especially include files, it is absolutly > necessary to run make dep to ensure that all the necessary files are remade. > > The make dep script in Linux tries to be smart enough so that you do not have > to run it after you change the configuration file (This is one reason it > does not use gcc -M). Thus you should hopefully only have to run it once. > > > b. IMHO 'gawk -f ....../depend.awk *[hcS]` can be replaced by: > > grep #include *[hcS] > tmpfile > > small_C(!!!)_prog tmpfile > .depend > > or > > grep #include *[hcS] | small_prog > .depend > > This certainly could be done, but I really doubt that it would be any faster. >
I've just tried grep "#include" *h in include/linux - few sec. - IMHO gawk+script will take more time than small c program, that works w/ result of grep ;)
> > c. make dep takes ~1-2h on 386sx25/4Mb :-(( > > It AT LEAST depends unneeded files - like scsi in 1. > > This is so you can change the configuration to include SCSI and not have to > rerun make dep. > > > d. make dep depends ALL - including linux/include - ANY time it runs :-(( > > This is perhaps an area that could be improved. However, my idea when I wrote > the script was that you would only run make dep once. If you only run it > once, it would have to do all these files anyway. (Of course if you change > in include files, or add include files to .c files, you have to rerun > make dep). > > > e. IMHO if I install kernel src in /usr/src && I haven't modify it -> > > `make dep` that was made by my friend will b SAME (right?) If yes, > > then maybe in linux-x.x.xx.tar.gz must be all dependencies? > > Yes, it would be possible to include the .depends files in with the kerenl > source. Of course then the problem is that everyone is downloading something > that they could recreate locally. Perhaps the best option would be to have > a make dummydepend option which would create an empty .depends files for people > who just want to recompile a kernel with a single configuration option, and > dont want to do any hacking. I have been meaning for almost a year to do > some more work on the Makefiles, and I have not had time. I just found out > I have mono, so I may have a lot of time on my hands (of course I should > probably spend it sleeping). I will put that option into the Makefile and > see if Linus likes it. >
10x, 10x, 10x ;) I REALLY have P-100 where I can compile kernel, but here (in Russia) there are still ( :-((( ) many ppl who don't have it...
BTW, IMHO on notebooks usually are 2" HDDs, and such HDDs are not big (~360 max)... So it's cool to b able to compile a little program there, when needed (sometimes ;), but not cool to not have place to put .o from that program on HDD, coz HDD is filled up w/ kernel sources ;)
Maybe make delete_unused is possible ? ;) Not all ppl can CORRECTLY delete unused/unneed files....
> Jim >
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