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Re: [libvirt] namespace clean shared libraries



On Thu, Aug 02, 2012 at 01:18:12PM +0200, Wido den Hollander wrote:
> On 07/08/2012 07:51 PM, Bruno Haible wrote:
> >Daniel P. Berrange wrote:
> >>If its better to just do it in libvirt config.h, then we
> >>can do that too
> >
> >Yes, doing '#define foo libvirt_foo' in config.h is the preferred way
> >of achieving a namespace clean shared library.
> >
> >There are two ways to generate these #defines:
> >
> >1) You collect manually, on various systems, the set of symbols that you
> >    don't want to clash with symbols from other shared libraries. You need
> >    to do this on various systems, because gnulib may define functions
> >    'rpl_fflush' or 'dprintf' on some systems and not on others.
> >
> >2) You collect, from a set of header files, the set of symbols that you
> >    want to have exported, and process all other symbols with
> >      '#define foo libvirt_foo'
> >
> >    This approach is more robust, but requires to compile all *.o files
> >    twice: Once with the initial settings (no #define), and once for real.
> >
> >    This approach is implemented in libunistring. Look at the config.h rule
> >    in this Makefile.am [1]. There are two auxiliary scripts: 'declared.sh' [2]
> >    extracts the symbols from a .h file (assuming a particular coding style).
> >    'exported.sh' [3] extracts te symbols of a .o file.
> >
> 
> I don't want to rush anything, but I see that libvirt 0.10 will be
> coming out soon and I don't think this has been corrected?
> 
> Right now this means that libvirt is not usable on Ubuntu 12.04
> systems when you want to use the secrets of libvirt.
> 
> Is it feasible to have this fixed before 0.10 comes out?

Try applying this patch to your source tree

diff --git a/configure.ac b/configure.ac
index 6b189db..4f906bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2876,6 +2876,10 @@ test "x$lv_cv_static_analysis" = xyes && t=1
 AC_DEFINE_UNQUOTED([STATIC_ANALYSIS], [$t],
   [Define to 1 when performing static analysis.])
 
+AC_DEFINE_UNQUOTED([isbase64],[gnulib_isbase64],[Hack to avoid symbol clash])
+AC_DEFINE_UNQUOTED([base64_encode],[gnulib_base64_encode],[Hack to avoid symbol clash])
+AC_DEFINE_UNQUOTED([base64_encode_alloc],[gnulib_base64_encode_alloc],[Hack to avoid symbol clash])
+
 AC_OUTPUT(Makefile src/Makefile include/Makefile docs/Makefile \
          docs/schemas/Makefile \
          gnulib/lib/Makefile \


Regards,
Daniel
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