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Date: Tue, 26 Jan 2016 12:20:04 +0100
From: Marc =?UTF-8?B?TWFyw60=?= <markmb@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v3] Add optionrom compatible with fw_cfg
	DMA version
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To: Stefan Hajnoczi <stefanha@redhat.com>
Cc: "Gabriel L. Somlo" <somlo@cmu.edu>, qemu-devel@nongnu.org, Kevin O'Connor <kevin@koconnor.net>, Gerd Hoffmann <kraxel@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Laszlo <lersek@redhat.com>

On Tue, 26 Jan 2016 11:11:54 +0000
Stefan Hajnoczi <stefanha@redhat.com> wrote:

> On Mon, Jan 25, 2016 at 02:17:48PM +0100, Marc Mar=C3=AD wrote:
> > +linuxboot_dma.img: linuxboot_dma.o
> > +	$(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m elf_i386
> > -Ttext 0 -e _start -s -o $@ $<,"  Building $(TARGET_DIR)$@") +
> >  %.img: %.o
> >  	$(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -Ttext 0 -e
> > _start -s -o $@ $<,"  Building $(TARGET_DIR)$@") =20
>=20
> Why is -m elf_i386 necessary for linuxboot_dma.img but not for the
> other *.img files?

I cannot give a precise explanation. But if I don't force an output
type, I get this error:

Building optionrom/linuxboot_dma.img
ld: i386 architecture of input file `linuxboot_dma.o' is incompatible
with i386:x86-64 output

Marc