apply universal rpath policy, that does not contain absolute paths

Author: ichinii

CMakeLists.txt

@@ -11,6 +11,27 @@ set(CMAKE_CUDA_STANDARD 20)
 set(CMAKE_CUDA_STANDARD_REQUIRED ON)
 # ------------------
 
+# --- Universal RPATH policy ---
+# Don't skip RPATH when installing, but don't hardcode build dirs either
+set(CMAKE_SKIP_BUILD_RPATH FALSE)
+set(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
+# When building, allow local RPATH so binaries work in build tree
+set(CMAKE_BUILD_RPATH_USE_ORIGIN TRUE)
+# Prefer relative RPATHs (avoids absolute /build/ paths)
+set(CMAKE_BUILD_RPATH "$ORIGIN/../lib")
+# When installing, make binaries relocatable
+set(CMAKE_INSTALL_RPATH "$ORIGIN/../lib")
+# Don’t automatically include system dirs in RPATH (avoid pollution)
+set(CMAKE_INSTALL_RPATH_USE_LINK_PATH FALSE)
+# CMake policies (for modern behavior)
+if(POLICY CMP0068)
+  cmake_policy(SET CMP0068 NEW)  # RPATH settings apply to install
+endif()
+if(POLICY CMP0072)
+  cmake_policy(SET CMP0072 NEW)  # Prefer config mode find_package for OpenGL
+endif()
+# ------------------
+
 # ---- Options ----
 option(RAYX_WERROR "add -Werror option. Warning will be treated as errors." OFF) # inactive per default
 if (RAYX_WERROR)