[CMake] Setting RPATH lookup on macOS

[Juan Sanchez]

The macOS install_name_tool can be used to change the RPATH of your
binaries.  It can also be used to set the path for each of the libraries to
be loaded.  For a python module I compile, I copy each of its dylib into
the appropriate directory relative to my shared library.  I then use the
install_name_tool to change from an absolute path to a path relative to
@loader_path.

install_name_tool -change $j "@loader_path/../gcc/`basename $j`" $i
where $j is the full path output from "otool -L" and "@loader_path/../gcc"
would point to a directory "gcc" relative to the directory containing my
python module.

For a binary executable, I would explore placing required dylib files into
a directory relative to @executable_path.

Regards,

Juan



On Wed, Sep 11, 2019 at 4:33 PM Michael Jackson <mike.jackson at bluequartz.net>
wrote:

> Already looked on google and at the CMake documentation but everything
> listed does not seem to work so here is the setup.
>
> I am using MKL and I have a home grown FindMKL since there isn’t an
> official one. Inside that is the typical find_library() calls which will
> find the libraries just fine. One of those libraries is a dynamic library
> (.dylib). Using otool -L on that library the install_name is encoded as
> @rpath.
>
> Now I have my add_executable(foo…) and target_link_libraries (Foo
> ${MKL_LIBRARIES} ).
>
> Everything compiles and links fine. The issue is at runtime. The app will
> not launch because libmkl_rt.dylib is not loaded because the path to that
> library is not encoded into the executable.
>
> 639:[mjackson at ferb:ifort-release]$ otool -l
> Bin/EMsoftWorkbench.app/Contents/MacOS/EMsoftWorkbench | grep "path"
>          name @rpath/libEbsdLib.dylib (offset 24)
>          name @rpath/libmkl_rt.dylib (offset 24)
>          name @rpath/QtOpenGL.framework/Versions/5/QtOpenGL (offset 24)
>          name @rpath/QtNetwork.framework/Versions/5/QtNetwork (offset 24)
>          name @rpath/QtConcurrent.framework/Versions/5/QtConcurrent
> (offset 24)
>          name @rpath/QtWidgets.framework/Versions/5/QtWidgets (offset 24)
>          name @rpath/QtGui.framework/Versions/5/QtGui (offset 24)
>          name @rpath/QtCore.framework/Versions/5/QtCore (offset 24)
>          path /Users/Shared/EMsoft_SDK-ifort/EbsdLib-0.1-Release/lib
> (offset 12)
>          path /Users/Shared/EMsoft_SDK-ifort/Qt5.12.3/5.12.3/clang_64/lib
> (offset 12)
>
>
> Oddly the Qt libraries and one of my own libraries do get their rpaths
> encoded. I feel like I need to append to the RPATH that gets encoded into
> the executable but I am not really figuring out how to do that.
>
> Help....
>
> --
> Michael Jackson | Owner, President
>       BlueQuartz Software
> [e] mike.jackson at bluequartz.net
> [w] www.bluequartz.net <http://www.bluequartz.net>
>
>
> --
>
> Powered by www.kitware.com
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Kitware offers various services to support the CMake community. For more
> information on each offering, please visit:
>
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
> CMake Training Courses: http://cmake.org/cmake/help/training.html
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Follow this link to subscribe/unsubscribe:
> https://cmake.org/mailman/listinfo/cmake
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://cmake.org/pipermail/cmake/attachments/20190912/094c412f/attachment.html>