Simplify cmake and refine error messages

CMakeLists.txt

@@ -98,6 +98,9 @@ target_link_libraries(onnxruntime-genai PRIVATE onnxruntime_extensions)
 target_link_directories(onnxruntime-genai PRIVATE ${ORT_LIB_DIR})
 target_link_libraries(onnxruntime-genai PRIVATE Threads::Threads)
 
+# The genai library itself is always embedded in the shared library
+list(APPEND ortgenai_embed_libs "$<TARGET_FILE:onnxruntime-genai>")
+
 # we keep the shared libraries disconnected on Android as they will come from separate AARs and we don't want to force
 # the ORT version to match in both.
 if(CMAKE_SYSTEM_NAME STREQUAL "Android" OR CMAKE_SYSTEM_NAME STREQUAL "Linux" OR (CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND (NOT BUILD_APPLE_FRAMEWORK) AND (NOT MAC_CATALYST)))

src/generators.cpp

@@ -152,7 +152,7 @@ struct LibraryHandle {
     auto path = Ort::GetCurrentModuleDir() + "/" + filename;
     handle_ = dlopen(path.c_str(), RTLD_NOW | RTLD_LOCAL);
     if (!handle_)
-      throw std::runtime_error(std::string("Failed to load library: ") + path + " Error:" + dlerror());
+      throw std::runtime_error(std::string("Failed to load library: ") + dlerror());  // dlerror() includes the path
   }
   ~LibraryHandle() {
     dlclose(handle_);

src/python/CMakeLists.txt

@@ -52,13 +52,6 @@ if(BUILD_WHEEL)
   file(COPY "${CMAKE_SOURCE_DIR}/ThirdPartyNotices.txt" DESTINATION ${WHEEL_TARGET_NAME}/)
   file(COPY "${CMAKE_SOURCE_DIR}/LICENSE" DESTINATION ${WHEEL_TARGET_NAME}/)
 
-  # Copy over the onnxruntime-genai.dll shared library
-  add_custom_command(TARGET python POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E copy
-    $<TARGET_FILE:onnxruntime-genai> $<TARGET_FILE:python>
-    ${WHEEL_TARGET_NAME}
-    COMMENT "Copying files to wheel directory: ${WHEEL_TARGET_NAME}"
-  )
   add_custom_command(TARGET python POST_BUILD
     COMMAND ${CMAKE_COMMAND} -E copy
     ${ortgenai_embed_libs} $<TARGET_FILE:python>