From: soulxu<soulxu(a)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?

I still provide a patch for this. Just make it is working now. Signed-off-by: soulxu<soulxu(a)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 endif libvirt_driver_qemu_la_CFLAGS = $(NUMACTL_CFLAGS) \ + $(GNUTLS_CFLAGS) \ + $(LIBXML_CFLAGS) \

-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)

于 2011年10月18日 22:45, Eric Blake 写道: > On 10/18/2011 02:06 AM, Xu He Jie wrote: >> From: soulxu&lt;soulxu(a)soulxu-ThinkPad-T410.(none)&gt; >> >> 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&lt;soulxu(a)soulxu-ThinkPad-T410.(none)&gt; Just found I forgot configuring git. The Signed-off-by should be: Signed-off-by: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt; >> --- >> 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 >> endif >> 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? Yes, I get a second link error. When I just add GNUTLS_LIBS to there, I get another error, as below: /usr/bin/ld: ../src/.libs/libvirt_driver_qemu.a(libvirt_driver_qemu_la-qemu_domain.o): undefined reference to symbol &#39;xmlXPathRegisterNs@(a)LIBXML2_2.4.30&#39; /usr/bin/ld: note: &#39;xmlXPathRegisterNs@(a)LIBXML2_2.4.30&#39; is defined in DSO /usr/lib/libxml2.so so try adding it to the linker command line /usr/lib/libxml2.so: could not read symbols: Invalid operation collect2: ld returned 1 exit status make[3]: *** [libvirtd] Error 1 So I add LIBXML_CFLAGS and LIBXML_LIBS to there too. > >> -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) > > Likewise. > > 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. > -- libvir-list mailing list libvir-list(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list

On 10/18/2011 08:06 PM, Xu He Jie wrote: >> 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). >> >> Likewise. >> >> 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. >> >> > Yes, I get a second link error. When I just add GNUTLS_LIBS to there, > I get another error, as below: > > /usr/bin/ld: > ../src/.libs/libvirt_driver_qemu.a(libvirt_driver_qemu_la-qemu_domain.o): > undefined reference to symbol &#39;xmlXPathRegisterNs@(a)LIBXML2_2.4.30&#39; > /usr/bin/ld: note: &#39;xmlXPathRegisterNs@(a)LIBXML2_2.4.30&#39; is defined in > DSO /usr/lib/libxml2.so so try adding it to the linker command line In which case, ACK and pushed. Your original patch was (mistakenly) attributed to <soulxu(a)soulxu-ThinkPad-T410.(none)&gt;, which is not a valid address; you should probably fix your ~/.gitconfig settings on that computer. Hopefully I was correct in re-attributing authorship to the email you used for previous patches.