Set the RPATH in the installed strumpack library

CMakeLists.txt

@@ -32,6 +32,29 @@ include(GNUInstallDirs)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/Modules")
 
+##############################################################
+## settings for RPATH,
+## see https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling
+# use, i.e. don't skip the full RPATH for the build tree
+set(CMAKE_SKIP_BUILD_RPATH FALSE)
+
+# when building, don't use the install RPATH already
+# (but later on when installing)
+set(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
+
+set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_LIBDIR}")
+
+# add the automatically determined parts of the RPATH
+# which point to directories outside the build tree to the install RPATH
+set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
+
+# the RPATH to be used when installing, but only if it's not a system directory
+list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_LIBDIR}" isSystemDir)
+if("${isSystemDir}" STREQUAL "-1")
+    set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_LIBDIR}")
+endif("${isSystemDir}" STREQUAL "-1")
+##############################################################
+
 # figure out Fortran/C name mangling
 include(FortranCInterface)
 FortranCInterface_HEADER(