Re: [Libguestfs] [PATCH 4/4] java: Link with gnulib to resolve missing hash_free symbol.
On Wed, Aug 22, 2018 at 12:56:47PM +0200, Pino Toscano wrote:
On Tuesday, 14 August 2018 15:42:13 CEST Richard W.M. Jones wrote:
> ---
> java/Makefile.am | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/java/Makefile.am b/java/Makefile.am
> index 81c20f266..1bad9a853 100644
> --- a/java/Makefile.am
> +++ b/java/Makefile.am
> @@ -122,7 +122,8 @@ libguestfs_jni_la_CFLAGS = \
> libguestfs_jni_la_LIBADD = \
> $(top_builddir)/common/structs/libstructs.la \
> $(top_builddir)/common/utils/libutils.la \
> - $(top_builddir)/lib/libguestfs.la
> + $(top_builddir)/lib/libguestfs.la \
> + $(top_builddir)/gnulib/lib/libgnu.la
Hmm what's the exact error in this case? On which platform?
Fedora 28:
Exception in thread "main" java.lang.UnsatisfiedLinkError:
/home/rjones/d/libguestfs-master/java/.libs/libguestfs_jni.so.1.39.8:
/home/rjones/d/libguestfs-master/java/.libs/libguestfs_jni.so.1.39.8: undefined symbol:
hash_free
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1857)
at java.lang.Runtime.loadLibrary0(Runtime.java:870)
at java.lang.System.loadLibrary(System.java:1122)
at com.redhat.et.libguestfs.GuestFS.<clinit>(GuestFS.java:51)
at Bindtests.main(Bindtests.java:33)
The java binding does not explicitly use the hash stuff from gnulib.
It uses the CLEANUP_* macros, and they appear to pull in the hash_free
function (via guestfs_int_cleanup_hash_free).
What does confuse me is why linking with libutils.a causes the
hash_free dependency to be pulled in, since if my understanding of
static linking is correct it should only pull in whole object files
which are actually used. This I cannot explain.
Nevertheless the error message (see above) is repeatable and
undeniable evidence that something is wrong.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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