[ovs-discuss] openvswitch (Ubuntu) bug

Ben Pfaff blp at nicira.com
Wed Nov 24 20:25:46 UTC 2010

On Wed, Nov 24, 2010 at 11:49:16AM +0000, Dave Walker wrote:
> I'd like to raise that the Debian package imported to Ubuntu Natty
> failed to build from source.  A bug has been opened against this
> package in Ubuntu [0].
> I believe it is due to linker behaviour change in Natty:
> "The linking behaviour was changed to not resolve symbols anymore
>     in indirectly linked shared libraries.  A binary directly using
>     a symbol from a shared library has to link with this library.
>     Details can be found at [3], an analysis of required changes (and
>     some patches) for packages in main can be found at [4]. A list
>     of open issues is found at [5].
> " -- [1]
> This pretty much means that -lcrypto explicitly needs to be added
> where -lssl is used.  I've added a trivial patch [2] to the Ubuntu
> package to achieve this, and seems to resolve the build failure.
> However, it should probably be part of configure.ac.

Thank you for the report.

It looks like Open vSwitch just needs to use pkg-config to check for
openssl instead of libssl.

Here's a patch, does it fix it?



--8<--------------------------cut here-------------------------->8--

From: Ben Pfaff <blp at nicira.com>
Date: Wed, 24 Nov 2010 12:25:10 -0800
Subject: [PATCH] configure: Check for pkg-config "openssl" library instead of "libssl".

Checking for libssl only does not necessarily link against libcrypto, so
the build can gratuitously fail.

Reported-by: Dave Walker <DaveWalker at ubuntu.com>
Ubuntu bug #680439.
 AUTHORS           |    1 +
 m4/openvswitch.m4 |    6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/AUTHORS b/AUTHORS
index 3e80eef..d283def 100644
@@ -40,6 +40,7 @@ Brad Hall               brad at nicira.com
 Brandon Heller          brandonh at stanford.edu
 Bryan Fulton            bryan at nicira.com
 Cedric Hobbs            cedric at nicira.com
+Dave Walker             DaveWalker at ubuntu.com
 Derek Cormier           derek.cormier at lab.ntt.co.jp
 DK Moon                 dkmoon at nicira.com
 Ghanem Bahri            bahri.ghanem at gmail.com
diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4
index c5f0742..fe30eec 100644
--- a/m4/openvswitch.m4
+++ b/m4/openvswitch.m4
@@ -75,18 +75,18 @@ AC_DEFUN([OVS_CHECK_OPENSSL],
    if test "$ssl" != false; then
        dnl Make sure that pkg-config is installed.
-       PKG_CHECK_MODULES([SSL], [libssl], 
+       PKG_CHECK_MODULES([SSL], [openssl], 
           if test "$ssl" = check; then
-            AC_MSG_WARN([Cannot find libssl:
+            AC_MSG_WARN([Cannot find openssl:
 OpenFlow connections over SSL will not be supported.
 (You may use --disable-ssl to suppress this warning.)])
-            AC_MSG_ERROR([Cannot find libssl (use --disable-ssl to configure without SSL support)])
+            AC_MSG_ERROR([Cannot find openssl (use --disable-ssl to configure without SSL support)])

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