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]
