On Wednesday, July 20, 2011 8:34:57 am Julian H. Stacey wrote: > Hi, > Reference: > > From: John Baldwin <[email protected]> > > Date: Wed, 20 Jul 2011 07:48:05 -0400 > > Message-id: <[email protected]> > > John Baldwin wrote: > > On Wednesday, July 20, 2011 7:33:26 am Julian H. Stacey wrote: > > > What should FreeBSD do ? > > > Add a comment to man gcc ... that -march=i586 is not > > > enough, & feed the comment back to gcc project & see how > > > they want to handle it ? > > > > No, this is not a GCC bug. If you want to use a single build machine that > > will compile programs for other machines on a network to use, it must use > > the > > lowest common denominator for its CPUTYPE in /etc/make.conf. > > > > The out-of-the-box crt files from a FreeBSD install will work fine on a 486 > > and above, so can only get yourself into this quandry by building a new > > world > > with a CPUTYPE (or similar CFLAGS) setting in /etc/make.conf that violates > > this rule. > > > > You can fix your machine by fixing the CPUTYPE in your build machine and > > building and installing a new world (do use NO_CLEAN=yes for your build, do > > a > > full build). You will also want to rebuild any other binaries on this > > machine > > that you share with other machines. > > > > -- > > John Baldwin > > > Hi John, > Yes I realise all that now thanks. > The point now is man gcc is misleading/ incomplete: > "-march=cpu-type > Generate instructions for the machine type cpu-type." > Those instructions will not make a program that runs on a lesser CPU type > without alternate crt for lesse CPU. > > CFLAGS in make.conf is fine for single developer/ host debugging, > but is not appropriate for multi user multi make builds os src/ ports/ other > > Its seems just that gcc -march fails to select alternate crt. > > One gross ugly solution needing root would be to create chroots, > but Too ugly. > > I suggest gcc via -march should also be used as a selection for sub > dirs for crt ? & we should co-operate with gcc project on that, > *BSD & *linux must all face same phenomena so lets not develop > a non standard solution.
I think this is a harder problem than you expect. It is not just the crt files that matter, but every library. You would need CPU-specific versions of every static library on the build system, and possibly you would want to do this for all shared libraries too. -- John Baldwin _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
