Re: [Xen-devel] [libvirt] [PATCH V2] libxl: use LIBXL_API_VERSION 0x040200

[Martin Kletzander <mkletzan@xxxxxxxxxx>]

On Thu, Apr 14, 2016 at 04:35:12PM -0600, Jim Fehlig wrote:
> To ensure the libvirt libxl driver will build with future versions
> of Xen where the libxl API may change in incompatible ways,
> explicitly use LIBXL_API_VERSION 0x040200. The libxl driver
> does use new libxl APIs that have been added since Xen 4.2, but
> currently it does not make use of any changes made to existing
> APIs such as libxl_domain_create_restore or libxl_set_vcpuaffinity.
> The version can be bumped if/when the libxl driver consumes the
> changed APIs.
>
> Further details can be found in the following discussion thread
>
> https://www.redhat.com/archives/libvir-list/2016-April/msg00178.html
> Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
> ---
> configure.ac             |  2 ++
> src/libxl/libxl_conf.h   | 12 ------------
> src/libxl/libxl_domain.c | 15 ---------------
> 3 files changed, 2 insertions(+), 27 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index b1500f6..446f2a2 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -894,6 +894,7 @@ if test "$with_libxl" != "no" ; then
>     PKG_CHECK_MODULES([LIBXL], [xenlight], [
>      LIBXL_FIRMWARE_DIR=`$PKG_CONFIG --variable xenfirmwaredir xenlight`
>      LIBXL_EXECBIN_DIR=`$PKG_CONFIG --variable libexec_bin xenlight`
> +     LIBXL_CFLAGS="$LIBXL_CFLAGS -DLIBXL_API_VERSION=0x040200"
>      with_libxl=yes
>     ], [LIBXL_FOUND=no])
>     if test "$LIBXL_FOUND" = "no"; then
> @@ -906,6 +907,7 @@ if test "$with_libxl" != "no" ; then
>         LIBS="$LIBS $LIBXL_LIBS"
>         AC_CHECK_LIB([xenlight], [libxl_ctx_alloc], [
>             with_libxl=yes
> +            LIBXL_CFLAGS="$LIBXL_CFLAGS -DLIBXL_API_VERSION=0x040200"
>             LIBXL_LIBS="$LIBXL_LIBS -lxenlight"
>         ],[
>             if test "$with_libxl" = "yes"; then

Looks good, I'd just adjust these two hunks so that it's added in one
place (and can be changed in one place later on so we don't fall into
trouble accidentally.  ACK with that changed.

Martin

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