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Re: [libvirt] [PATCH] compile: fix undefined reference to gnutls_x509_crt_get_dn with gcc-4.6.1

On 10/18/2011 02:06 AM, Xu He Jie wrote:
From: soulxu<soulxu soulxu-ThinkPad-T410 (none)>

When I compile libvirt with gcc-4.6.1 in ubuntu 11.10, got error as below:

   CCLD   libvirtd
/usr/bin/ld: ../src/.libs/libvirt_driver_qemu.a(libvirt_driver_qemu_la-qemu_migration.o): undefined reference to symbol 'gnutls_x509_crt_get_dn@@GNUTLS_1_4'
/usr/bin/ld: note: 'gnutls_x509_crt_get_dn@@GNUTLS_1_4' is defined in DSO /usr/lib/x86_64-linux-gnu/libgnutls.so so try adding it to the linker command line
/usr/lib/x86_64-linux-gnu/libgnutls.so: could not read symbols: Invalid operation
collect2: ld returned 1 exit status
make[3]: *** [libvirtd] Error 1

It can compile with gcc-4.5.2 in ubuntu 11.04, but it can not compile with gcc-4.6.1 in ubuntu 11.10.

I didn't find reason. Does Anyone know the reason or the different between gcc-4.5.2 and gcc-4.6.1?

More likely, the difference is not in gcc, but in ld policy - Ubuntu recently changed policy to no longer allow implicit link dependencies by default (that is, if A links against B, and B links against C, older distros allowed A to use symbols from C without explicitly linking against C, while newer distros require the explicit link).

I still provide a patch for this. Just make it is working now.

Signed-off-by: soulxu<soulxu soulxu-ThinkPad-T410 (none)>
  src/Makefile.am |    6 +++++-
  1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index 87d91ed..104efc6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -776,10 +776,14 @@ noinst_LTLIBRARIES += libvirt_driver_qemu.la
  #libvirt_la_BUILT_LIBADD += libvirt_driver_qemu.la
  libvirt_driver_qemu_la_CFLAGS = $(NUMACTL_CFLAGS) \
+                                $(GNUTLS_CFLAGS) \
+                                $(LIBXML_CFLAGS) \

I understand the addition of GNUTLS_CFLAGS, but why LIBXML_CFLAGS? Did you get a second link error?

  		-I top_srcdir@/src/conf $(AM_CFLAGS)
  libvirt_driver_qemu_la_LDFLAGS = $(AM_LDFLAGS)
  libvirt_driver_qemu_la_LIBADD = $(NUMACTL_LIBS) \
-				$(CAPNG_LIBS)
+				$(CAPNG_LIBS) \
+                                $(GNUTLS_LIBS) \
+                                $(LIBXML_LIBS)


Your approach to a fix is correct, but I need to know whether to use the patch as-is or whether we just need one library rather than two.

Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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