Intel TBB Linking and RPATH

Question

I'd like to use CMake, GTest, and Intel's TBB for a project on linux, and so far I've been able to build without complaint, but the dynamic linking required by TBB has been a bit of an issue for only one of their libraries.

I'm using their CMake functions invoked like so:

set(TBB_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/tbb)
set(TBB_BUILD_DIR "tbb_build_dir=${CMAKE_ARCHIVE_OUTPUT_DIRECTORY}")
set(TBB_BUILD_PREFIX "tbb_build_prefix=tbb")

include(${TBB_ROOT_DIR}/cmake/TBBBuild.cmake)

tbb_build(TBB_ROOT ${TBB_ROOT_DIR} 
          MAKE_ARGS 
              ${TBB_BUILD_DIR} 
              ${TBB_BUILD_PREFIX} 
          CONFIG_DIR 
          TBB_DIR)

find_package(TBB REQUIRED)

When running, I get the error:

error while loading shared libraries: libtbbmalloc_debug.so.2: cannot open shared object file: No such file or directory

After Running ldd <whatever_test_executable> I get the following output

linux-vdso.so.1 =>  (0x00007fff741b9000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fd99a6fd000)
libtbb_debug.so.2 => /home/mrbzapp/test_proj/build/Builds/lib/tbb_debug/libtbb_debug.so.2 (0x00007fd99a489000)
libtbbmalloc_proxy_debug.so.2 => /home/mrbzapp/test_proj/build/Builds/lib/tbb_debug/libtbbmalloc_proxy_debug.so.2 (0x00007fd99a285000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd99a081000)
libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007fd999dd4000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007fd999a99000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007fd999887000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fd99967f000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fd9992f7000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd998fee000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fd998dd7000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd998a0e000)
/lib64/ld-linux-x86-64.so.2 (0x000055a935c16000)
libtbbmalloc_debug.so.2 => not found
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fd9987f2000)
libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007fd9985c0000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fd99839e000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007fd998198000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fd997f92000)

During build I can see that CMake (and TBB's TBBBuild function) is adding /home/mrbzapp/test_proj/build/Builds/lib/tbb_debug/ to the rpath, and for most of the linked tbb libs they are using this path, but libtbbmalloc_debug.so.2 is being left out in the cold and it's bringing the whole thing down with it.

What I find completely baffling is that libtbbmalloc_debug.so.2 does exist, and exists alongside the other TBB libraries that are using the rpath set by TBB's functions.

What could I possibly be doing wrong, and what might I have to do in order to make sure all of these libraries are correctly linked at runtime and not just a handful?

Answer 1

MrBZapp.

I was able to reproduce this problem, thank you for reporting it. The problem is that libtbbmalloc_proxy_debug.so.2 can't find libtbbmalloc_debug.so.2 As a workaround I can propose you to "source /home/mrbzapp/test_proj/build/Builds/lib/tbb_debug/tbbvars.sh intel64" in your environment and after that execute your application.

Answer 2

Found a way to make things work, and extra details were probably in order.

I was using specifying the links by writing target_link_libraries(<target> ${TBB_IMPORTED_TARGETS}) when I ought to have been using target_link_libraries(<target> TBB::tbb)

I'm not positive this is the "correct" way to do things, but it is seems to be a way that is working.