linking to a specific version of library (libssl) in CmakeLists.txt

asked 2015-06-29 05:22:22 -0600

altella gravatar image

Hello all;

I am trying to link MvTec Halcon libraries in my ROS indigo node this way:

cmake_minimum_required(VERSION 2.8.3)

find_package(catkin REQUIRED COMPONENTS

find_package(PCL REQUIRED)

  INCLUDE_DIRS include



add_library(halcon_3d_lib src/halcon_3d_lib.cpp)
add_executable(ensenso_driver_node src/ensenso_driver_node.cpp)
add_executable(halcon3D_test_node src/halcon3D_test_node.cpp)

target_link_libraries(ensenso_driver_node ${catkin_LIBRARIES} ${PCL_LIBRARIES} halconcpp)
target_link_libraries(halcon_3d_lib ${catkin_LIBRARIES} ${PCL_LIBRARIES} halconcpp)
target_link_libraries(halcon3D_test_node ${catkin_LIBRARIES} ${PCL_LIBRARIES})

The problem I have is that when I use pcl:io module, the node links against libpq, and libpq to libssl. When I do not include link_directories(/opt/halcon/lib/x64-linux/) libssl is taken from /lib/x86_64-linux-gnu/ and everything works ok.

However, if add link_directories(/opt/halcon/lib/x64-linux/) the library is taken from /opt/halcon/lib/x64-linux.

Is there a way to specify in the CMakeLists.txt that PCL links against libssl in /lib/x86_64-linux-gnu/ and Halcon libraries against libssl in /opt/halcon/lib/x64-linux ?

How can I check differences between the two versions of libssl?

Thank you very much in advance.

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Are you aiming for one binary with two different libssl versions?

dornhege gravatar image dornhege  ( 2015-06-29 05:55:27 -0600 )edit

So just to clarify: you don't actually need your binaries to link against the SSL provided by Halcon?

gvdhoorn gravatar image gvdhoorn  ( 2015-06-29 05:59:42 -0600 )edit

It would be good to link Halcon with its own version of libssl to assess correct functionality, but I need the other libssl for, maybe yes, two versions of libssl in the same binary... could be possible?

altella gravatar image altella  ( 2015-06-29 07:12:15 -0600 )edit

Maybe this is possible somehow, but my intuition says, you're gonna get linker errors, because the same symbols will be there multiple times.

dornhege gravatar image dornhege  ( 2015-06-29 07:42:40 -0600 )edit

that's it...i think there is not a clean way to use both libraries in the same binary...

altella gravatar image altella  ( 2015-06-29 07:53:44 -0600 )edit

I have to agree with @dornhege: all my experience says this cannot be (cleanly) done. If it can be done, I'd expect segfaults as well once you get past any linker errors.

gvdhoorn gravatar image gvdhoorn  ( 2015-06-29 07:59:53 -0600 )edit