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maeldur
n00b
Joined: 25 Nov 2002
Posts: 14
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 Posted: Tue Dec 31, 2002 8:12 am Post subject: Cross-compiling between an AMD XP2000+ and a PII-450 |
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Since my pII 450 compiles quite slowly, and segfaults at times, is there a way I can download packages and optimize them for the pII off my amd, and transfer the packages over? I don't understand quite how thise would work.
TIA |
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keratos68
Guru
Joined: 27 Dec 2002
Posts: 561
Location: Blackpool, Lancashire, UK.
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| Posted: Tue Dec 31, 2002 9:36 am Post subject: |
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Yep,
edit /etc/make.conf and find the CCFLAGS line, change it to read:
| Code: |
CCFLAGS="-march=pentium2 -mcpu=pentium2 -Os -fomit-frame-pointer"
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"-march" and "-mcpu" instruct the C compiler to optimise for PII
"-Os" tells the C compiler to optimise for space, PII is reasonably okayish for executing binary code however the reduction in space (size of binary) will speed up any loading of the app and run-time linkages - X & KDE wil benefit from this!!!
There are many,many options you can assemble on the CCFLAGS line, check out "man gcc". I find this combination BOTH fast and stable.
[/code]
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Someone told me that "..they only ever made one mistake...."
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jukka
Apprentice
Joined: 06 Jun 2002
Posts: 249
Location: Zurich, Switzerland
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| Posted: Tue Dec 31, 2002 10:17 am Post subject: Re: Cross-compiling between an AMD XP2000+ and a PII-450 |
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hi,
| maeldur wrote: | | ...is there a way I can download packages and optimize them for the pII off my amd, and transfer the packages over? |
on your AMD, try something like '[variables] ebuild <ebuild-file> package', e.g.: | Code: | $ USE="-3dnow mmx" \
CHOST="i686-pc-linux-gnu" \
CFLAGS="-march=i686 -O2 -pipe" \
CXXFLAGS="-march=i686 -O2 -pipe" \
ACCEPT_KEYWORDS="x86" \
/usr/sbin/ebuild /usr/portage/net-mail/maildrop/maildrop-1.5.0-r1.ebuild package |
(see ebuild(1) for description of command 'package')
this fetches and compiles the software and builds a package (default location: /usr/portage/packages), but doesn't install it. you can transfer this package now to your P2 (using scp, ftp, ...), and install it by issuing a command like: | Code: | | $ /usr/bin/emerge /path/to/package.tbz2 |
HTH, jukka |
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maeldur
n00b
Joined: 25 Nov 2002
Posts: 14
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| Posted: Tue Dec 31, 2002 5:03 pm Post subject: |
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That works great, jukka, now, is there a way that it will build packages for all the dependencies as well? Also, are there scripts that will help this process along?
TIA |
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jukka
Apprentice
Joined: 06 Jun 2002
Posts: 249
Location: Zurich, Switzerland
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| Posted: Tue Dec 31, 2002 5:40 pm Post subject: |
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| maeldur wrote: | | That works great, jukka |
uff, i didn't test it... 
| Quote: | | now, is there a way that it will build packages for all the dependencies as well? |
hmm... if you often / always compile for the same machine you could try this (i didn't test it...):- on your AMD, move /var/db/pkg to /var/db/pkg-AMD or so
- copy /var/db/pkg recursively from you P2 machine to your AMD and store it as /var/db/pkg-P2 or so
- do the same with the file /etc/make.conf, and maybe all the other files you need to have twice...
- write a script which creates / removes symlinks from those files / dirs to the real names, e.g. /etc/make.conf is a symlink to /etc/make.conf-P2 and so on
now, if you want to compile software for your P2 box, you call your script (which sets up the symlinks so they point to the P2 files), and you can start emerging.
| Quote: | | Also, are there scripts that will help this process along? |
i don't know...
good luck |
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