Setting the RPATH correctly can be rather tricky, but it is essential for third-party users. By default, CMake sets the RPATH of executables assuming they will be run from the build tree. However, upon installation, the RPATH is cleared, leading to trouble when a user would like to run hello-world_wDSO. Using the ldd tool on Linux, we can inspect the hello-world_wDSO executable in the build tree to see where the loader will look for libmessage.so:
libmessage.so.1 => /home/user/cmake-cookbook/chapter-10/recipe-01/cxx-example/build/lib64/libmessage.so.1 (0x00007f7a92e44000)
Running ldd hello-world_wDSO in the installation prefix would result instead in the following:
libmessage.so.1 => Not found
This is clearly wrong. However, ...
