Selon Wolfgang Pfeiffer <[EMAIL PROTECTED]>: > On Thu, Apr 14, 2005 at 07:15:45PM +0200, Wolfgang Pfeiffer wrote: > > On Thu, Apr 14, 2005 at 03:47:35PM +0200, Carsten Friede wrote: > > > Hi. > > > > > > Is it possible to activate specific compiler flags, when building > > > packages from source, eg. for the AltiVec, to improve performance? > > > > Not being sure whether you need to know the flags, or how to use them > > with the Debian package build system, like make-kpkg etc. > > > > If you simply want some flags: From my bookmarks: > > > > <http://www.freehackers.org/gentoo/gccflags/flag_gcc3.html> > > <http://www.freehackers.org/gentoo/gccflags/flag_gcc3opt.html> > > > <http://gcc.gnu.org/onlinedocs/gcc/RS_002f6000-and-PowerPC-Options.html#RS_002f6000-and-PowerPC-Options> > > <http://linuxreviews.org/howtos/compiling/safe-cflags/> > > <http://linuxreviews.org/howtos/compiling/unsafe-cflags/#toc1> > > > > But I'd have a look at the sources you want the flags being fed into, > > and whether the flags described on the pages above are not already > > used there ... :) > > > > If you want to know how to feed the flags to, e.g, make-kpkg for a > > "live" compile, then I can't help. Sorry .. > > Hah, by accident, when trying to learn something for kernel compiles I > stumbled over this in /usr/share/doc/kernel-package/README.gz (which > is part of, IINM, "kernel-package") > > --------------------------------------------------------- > % MAKEFLAGS="CC=gcc-3.2" make-kpkg ... > -------------------------------------------------------- > > So it seems you can feed flags directly into Debian build processes, on > the command line ... but I don't know yet the syntax if there's more than > one flag to be fed to, e.g., make-kpkg ... > > [Minutes later:] > > After some very fast glance over some Google results it looks like > there is a solution for multiflags-on-command-line: > > Example: > > MAKEFLAGS="CC=amd64-linux-gcc V=1 HOSTCC=gcc-3.4" > > [from: > <http://debian-amd64.alioth.debian.org/patches/current/kernel-image-2.6.8-amd64_2.6.8-12.0.0.1.gcc4.patch> > .... and I can't gauge whether the code on this page is correct or not] > > I just played a bit with it: > > $ export MAKEFLAGS=CC=gcc-3.2 CXXFLAGS="-O3 -pipe -mpowerpc-gfxopt" > $ env | grep mpower > CXXFLAGS=-O3 -pipe -mpowerpc-gfxopt > $ env | grep gcc > MAKEFLAGS=CC=gcc-3.2 > $ > > :))))) > > > Please: > > Don't take the flags above as valid ones: I was just playing .. Don't > do the above, if you need some serious work get done :) ... And wait > for those here being able to confirm I wasn't writing bs .. :) > > At any rate it seems to look good ... perhaps ask Google for more ... :) > > Good luck, and please let us know if you know more than I do currently ... > > And thanks for asking your question: I was looking for the answer > since some time ago ... simply forgot about it, only being re-minded > to it by your email today ... :) > > Regards > Wolfgang > > -- > Wolfgang Pfeiffer > http://profiles.yahoo.com/wolfgangpfeiffer > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > >
Hi. I have had debian for a long time before installing a gentoo to test it. I've build it from scratch (stage1...) with the following flags CFLAGS="-O3 -mpowerpc -mtune=G4 -mcpu=G4 -mabi=altivec -maltivec -mpowerpc-gfxopt -mpowerpc-gpopt -mnew-mnemonics -mno-strict-align -pipe" If you get an error with mtune or mcpu you should try with march (which is now deprecated)... Arnaud FONTAINE -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
