Date: Wed, 25 May 2011 11:34:29 -0400 From: Arnaud Lacombe <lacombar@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org, Dimitry Andric <dim@freebsd.org> Subject: Re: [PATCH] Fix CFLAGS overwrite by Makefile Message-ID: <BANLkTimzTGpS7zT1FC=AhHunQ-OQqThAUw@mail.gmail.com> In-Reply-To: <201105250943.15362.jhb@freebsd.org> References: <1306267772-31084-1-git-send-email-lacombar@gmail.com> <4DDC17E5.2020700@FreeBSD.org> <BANLkTi=wbrvXHDiKix8DYYi9kjk5N-_vBw@mail.gmail.com> <201105250943.15362.jhb@freebsd.org>
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Hi, On Wed, May 25, 2011 at 9:43 AM, John Baldwin <jhb@freebsd.org> wrote: >> The original trouble I met, is that building for an i586 target in a >> 32bits jail, on top of an amd64 system[0] (I do not have control over >> that setup) produces incorrect binaries. The current fix I've got is >> to define MACHINE_ARCH=3Di386 and CPUTYPE=3Di586. This enforces >> `-march=3Di586' to be passed to the compiler, for all except the >> bootloader (because it overwrites CFLAGS). With this, binaries >> produced works fine (ie. /bin/sh no longer SIGILL when bringing up the >> system). So I suspect that gcc default to i686 in this setup and >> corrupt all the binaries, thus the attached patch. > > Wait. =A0You must have something wrong in your jail if you can't do a bui= ldworld > with CPUTYPE set to none and have it do the right thing. =A0You need to f= ind > your root problem. =A0Forcing CPUCFLAGS for the boot code is a band-aid, = it's > not the right solution to your problem. > Unless error of my part, I never mentioned it was using `buildworld', which it is not. The system uses bare calls to make(1) in the sys/boot/ directory. As the jail is 32bits, it was expected not to be an issue, but the jail compiler uses /lib/libstand.a to link the loader, and it obviously contains i686-only instructions, which trigger a reset of an i586-only CPU. The more broad issue with the setup is that gcc within that environment, without being told -march=3Di586, produces i686 instructions which are incompatible with the target CPU. - Arnaud
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