[libvirt] [PATCH] build: silence libtool warning

[Daniel P. Berrange]

On Fri, May 25, 2012 at 10:06:12AM -0600, Eric Blake wrote:
> Libtool supports linking directly against .o files on some platforms
> (such as Linux), which happens to be the only place where we are
> actually doing that (for the dtrace-generated probes.o files).  However,
> it raises a big stink about the non-portability, even though we don't
> attempt it on platforms where it would actually fail:
> 
>   CCLD   libvirt_driver_qemu.la
> 
> *** Warning: Linking the shared library libvirt_driver_qemu.la against
> the non-libtool
> *** objects  libvirt_qemu_probes.o is not portable!
> 
> This shuts libtool up by creating a proper .lo file that matches
> what libtool normally expects.
> 
> * src/Makefile.am (%_probes.lo): New rule.
> (libvirt_probes.stp, libvirt_qemu_probes.stp): Simplify into...
> (%_probes.stp): ...shorter rule.
> (CLEANFILES): Clean new .lo files.
> (libvirt_la_BUILT_LIBADD, libvirt_driver_qemu_la_LIBADD)
> (libvirt_lxc_LDADD, virt_aa_helper_LDADD): Link against .lo file.
> * tests/Makefile.am (PROBES_O, qemu_LDADDS): Likewise.
> ---
> 
> I got tired enough of the warning to figure out how to shut it up;
> libtool was rather particular about parsing the first two lines of
> comments embedded in the .lo file before declaring it to have correct
> syntax.
> 
> However, I got stumped by the next round of warnings:
> 
>   CCLD   qemuxml2xmltest
> 
> *** Warning: Linking the executable qemuxml2xmltest against the loadable module
> *** libvirt_driver_qemu.so is not portable! 
> 
> Anyone have a clue on that one?  Would a convenience library be the key?

Hmm, perhaps if we built libvirt_driver_qemu_impl.la and then
make both libvirt_driver_qemu.so and qemuxml2xmltest link to
that convenience library, it'd be happy.

> 
>  src/Makefile.am   |   28 ++++++++++++++++++----------
>  tests/Makefile.am |    4 ++--
>  2 files changed, 20 insertions(+), 12 deletions(-)

ACK

Daniel
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