Re: [Xen-devel] [PATCH raisin 4/4] Update to 4.7, update qemu and qemu_traditional recipes

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 14 Jun 2016, George Dunlap wrote:
> On 14/06/16 10:46, Stefano Stabellini wrote:
> > On Mon, 13 Jun 2016, George Dunlap wrote:
> >> Add a 4.7 config file, make it the default.
> >>
> >> Also update the qemu and qemu_traditional recipies after Ian Cambell's
> >> work to split off separate libraries.
> >>
> >> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
> >> ---
> >> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> >> ---
> >>  components/qemu             | 21 +++++++++++++--------
> >>  components/qemu_traditional |  2 +-
> >>  configs/config-4.7          |  8 ++++++++
> >>  defconfig                   |  2 +-
> >>  4 files changed, 23 insertions(+), 10 deletions(-)
> >>
> >> diff --git a/components/qemu b/components/qemu
> >> index e0d92a5..8624b50 100644
> >> --- a/components/qemu
> >> +++ b/components/qemu
> >> @@ -23,15 +23,20 @@ function qemu_build() {
> >>      cd "$BASEDIR"
> >>      git-checkout $QEMU_URL $QEMU_REVISION qemu-dir
> >>      cd qemu-dir
> >> -    ./configure --enable-xen --target-list=i386-softmmu --prefix=$PREFIX \
> >> -        --extra-cflags="-I$INST_DIR/$PREFIX/include" \
> >> -        --extra-ldflags="-L$INST_DIR/$PREFIX/lib 
> >> -Wl,-rpath-link=$INST_DIR/$PREFIX/lib \
> >> +
> >> +    ./configure --enable-xen --target-list=i386-softmmu \
> >> +          --prefix=$PREFIX \
> >> +          --extra-cflags="-DXC_WANT_COMPAT_EVTCHN_API=1 \
> >> +          -DXC_WANT_COMPAT_GNTTAB_API=1 \
> >> +          -DXC_WANT_COMPAT_MAP_FOREIGN_API=1 \
> >> +                -I$INST_DIR/$PREFIX/include" \
> >> +          --extra-ldflags="-L$INST_DIR/$PREFIX/lib 
> >> -Wl,-rpath-link=$INST_DIR/$PREFIX/lib \
> >>                           -L$INST_DIR/$PREFIX/lib64 
> >> -Wl,-rpath-link=$INST_DIR/$PREFIX/lib64" \
> >> -        --disable-kvm \
> >> -        --disable-docs \
> >> -        --bindir=$PREFIX/lib/xen/bin \
> >> -        --datadir=$PREFIX/share/qemu-xen \
> >> -        --disable-guest-agent
> >> +          --bindir=$PREFIX/lib/xen/bin \
> >> +          --datadir=$PREFIX/share/qemu-xen \
> >> +          --disable-kvm \
> >> +          --disable-docs \
> >> +          --disable-guest-agent
> > 
> > This is adding XC_WANT_COMPAT_EVTCHN_API=1, etc, unconditionally. If we
> > make this change, will raisin still be able to buil an older qemu
> > against an older xen?
> 
> I've tested this with XEN_RELEASE set to 4.5 and 4.6, and it builds just
> fine.  The #define is just ignored, since neither Xen nor qemu in the
> 4.5 and 4.6 branches know anything about it.
> 
> If part of our goal is to be a repository of the canonical way to build
> things, though, perhaps it would be better to have the extra flags be
> conditional on the value of XEN_RELEASE.

If we are sure that it's ignored than it might be benign. Maybe we
should just add an in-code comment to explain why we added it though.

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