Re: [Xen-devel] [PATCH] raisin: enable ovmf build for arm64

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2015-10-13 at 11:58 +0100, Stefano Stabellini wrote:
> On Tue, 13 Oct 2015, Ian Campbell wrote:
> > On Mon, 2015-10-12 at 18:18 +0100, Stefano Stabellini wrote:
> > > @@ -30,9 +38,18 @@ function ovmf_build() {
> > >      git-checkout $OVMF_URL $OVMF_REVISION ovmf-dir
> > >      cd ovmf-dir
> > >  
> > > -    make -C BaseTools/Source/C
> > > -    OvmfPkg/build.sh -a X64 -b RELEASE -n 4
> > > -    cp Build/OvmfX64/RELEASE_GCC*/FV/OVMF.fd ovmf.bin
> > > +    make -C BaseTools
> > > +
> > > +    if [[ $RAISIN_ARCH = "arm64" ]]
> > 
> > Based on what I understand of the OVMF buildsystem I think you are
> > going to
> > eventually want a case $RAISIN_ARCH here, since it seems to vary a fair
> > bit.
> > 
> > > +    then
> > > +        export GCC48_AARCH64_PREFIX=
> > 
> > Won't this (unexpectedly) leak into other subsequent component builds?
> > Or
> > is each component built in a  fresh sub-shell?
> > 
> > What about host platforms which have a gcc other than 4.8? (e.g. Debian
> > Jessie uses 4.9 by default)
> > 
> > Should you add a comment explaining why this apparent workaround is
> > needed?
> 
> That is a good question. It all comes from
> https://wiki.linaro.org/LEG/UEFIforXEN, but I don't know why is
> required. Without GCC48_AARCH64_PREFIX= and -t GCC48, it won't build.

Is it just that GCC48_AARCH64_PREFIX defaults to some cross-compiler prefix
(e.g. aarch64-linux-gnu-) but a native build environment doesn't (always)
use that?

On Debian at least the prefixed name exists even for the native compiler,
but I'd not be surprised if that wasn't universal across all distros.

> Ard, do you know why? x86 doesn't need anything like that, as you can
> see below.
> 
> 
> > > +        bash -c "source edksetup.sh && build -a AARCH64 -t GCC48 -p
> > > ArmVirtPkg/ArmVirtXen.dsc -b RELEASE"
> > > +        mkdir -p "$INST_DIR"/$PREFIX/lib/xen/boot
> > > +        cp Build/ArmVirtXen-AARCH64/RELEASE_GCC*/FV/XEN_EFI.fd
> > > "$INST_DIR"/$PREFIX/lib/xen/boot/XEN_EFI.fd
> > > +    else
> > > +        OvmfPkg/build.sh -a X64 -b RELEASE -n 4
> > > +        cp Build/OvmfX64/RELEASE_GCC*/FV/OVMF.fd ovmf.bin
> > > +    fi
> > >  
> > >      cd "$BASEDIR"
> > >  }
> > > 
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@xxxxxxxxxxxxx
> > > http://lists.xen.org/xen-devel
> > 

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