change RPATH for rayx-core, rayx-core-tst, rayx, rayx-ui

before, cmake determined RPATH automatically, using absolute paths
this creates RPATHs which are not portable.
Now CMake will add a relative RPATH.
Additionally, following RPATHs are added:
$ORIGIN # search next to the executable
$ORIGIN/lib
$ORIGIN/../lib

Author: ichinii

CMakeLists.txt

@@ -11,6 +11,10 @@ set(CMAKE_CUDA_STANDARD 20)
 set(CMAKE_CUDA_STANDARD_REQUIRED ON)
 # ------------------
 
+# --- Prevent CMake from using absolute paths in RPATH. Use relative paths instead ---
+set(CMAKE_BUILD_RPATH_USE_ORIGIN TRUE)
+# ------------------
+
 # ---- Options ----
 option(RAYX_WERROR "add -Werror option. Warning will be treated as errors." OFF) # inactive per default
 if (RAYX_WERROR)

Intern/rayx-core/CMakeLists.txt

@@ -54,6 +54,7 @@ endif()
 
 # ---- Project ----
 project(rayx-core VERSION ${RAYX_VERSION})
+
 file(GLOB_RECURSE SOURCE ${PROJECT_SOURCE_DIR}/src/*.cpp)
 file(GLOB_RECURSE ALPAKA_SOURCE
     ${PROJECT_SOURCE_DIR}/src/Shader/*.cpp

Intern/rayx-core/tests/CMakeLists.txt

@@ -7,6 +7,10 @@ enable_testing()
 set(BINARY rayx-core-tst)
 file(GLOB_RECURSE SOURCE *.h *.cpp)
 add_executable(${BINARY} ${SOURCE})
+set_target_properties(${BINARY} PROPERTIES
+    BUILD_RPATH "$ORIGIN;$ORIGIN/lib;$ORIGIN/../lib" # also $ORIGIN/../../lib/$<CONFIG> will be added automatically by CMake for multi-config generators
+    INSTALL_RPATH "$ORIGIN;$ORIGIN/lib;$ORIGIN/../lib" # TODO: review if this is necessary
+)
 add_test(NAME ${BINARY} COMMAND ${BINARY})
 # -----------------
 

Intern/rayx-ui/CMakeLists.txt

@@ -19,6 +19,11 @@ if(Vulkan_FOUND)
 
     add_executable(${PROJECT_NAME} WIN32 ${SOURCE} ${IMGUI_SOURCES})
 
+    set_target_properties(${PROJECT_NAME} PROPERTIES
+        BUILD_RPATH "$ORIGIN;$ORIGIN/lib;$ORIGIN/../lib"
+        INSTALL_RPATH "$ORIGIN;$ORIGIN/lib;$ORIGIN/../lib" # TODO: review if this is necessary
+    )
+
     if(MSVC)
         target_compile_options(${PROJECT_NAME} PRIVATE /W4)
         if(RAYX_WERROR)

Intern/rayx/CMakeLists.txt

@@ -6,8 +6,14 @@ cmake_minimum_required(VERSION 3.15 FATAL_ERROR)
 
 # ---- Project ----
 project(rayx VERSION ${RAYX_VERSION})
+
 file(GLOB_RECURSE SOURCE ${PROJECT_SOURCE_DIR}/src/*.cpp)
 add_executable(${PROJECT_NAME} ${SOURCE})
+
+set_target_properties(${PROJECT_NAME} PROPERTIES
+    BUILD_RPATH "$ORIGIN;$ORIGIN/lib;$ORIGIN/../lib"
+    INSTALL_RPATH "$ORIGIN;$ORIGIN/lib;$ORIGIN/../lib" # TODO: review if this is necessary
+)
 # ------------------