"make install" is wrong to install library dependencies under Linux
make install (or ninja install) is broken, at least under Linux.
It currently takes library dependencies that are properly installed on the host system, and copies them to a second install location derived from the CMake install prefix.
This triggers a CMake warning if cmake is run after make install [1]. The warning is fully explained here [2].
Root cause
We are confounding regular installation with creation of a binary package. Copying installed libraries is (sadly) necessary in the second case, but must not be done in the first case.
References
[1] To reproduce: Install. Then rerun cmake in build directory. Output has plenty of these:
CMake Warning at Tests/Unit/GUI/CMakeLists.txt:13 (add_executable):
Cannot generate a safe runtime search path for target UnitTestGUI because
files in some directories may conflict with libraries in implicit
directories:
runtime library [libtiff.so.6] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libtiffxx.so.6] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libgsl.so.27] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libgslcblas.so.0] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libfftw3.so.3] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libboost_iostreams.so.1.83.0] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libboost_program_options.so.1.83.0] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libQt6OpenGLWidgets.so.6] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libQt6OpenGL.so.6] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libQt6PrintSupport.so.6] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libQt6Widgets.so.6] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libQt6Gui.so.6] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
runtime library [libQt6Core.so.6] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
Some of these libraries may not be found correctly.Edited by Wuttke, Joachim