[bugfix] Only link the pytorch tensordispatcher against libtorch (#3225)

* Only link tensordispatcher against pytorch

* Only modify libraries when not using MSVC

src/runtime/tensordispatch.cc

@@ -39,8 +39,10 @@ bool TensorDispatcher::Load(const char *path) {
 #else   // !WIN32
   handle_ = dlopen(path, RTLD_LAZY);
 
-  if (!handle_)
+  if (!handle_) {
+    LOG(WARNING) << "TensorDispatcher: dlopen failed: " << dlerror();
     return false;
+  }
 
   for (int i = 0; i < num_entries_; ++i) {
     entrypoints_[i] = dlsym(handle_, names_[i]);

tensoradapter/pytorch/CMakeLists.txt

@@ -27,8 +27,15 @@ set(TORCH_TARGET_NAME "tensoradapter_pytorch_${TORCH_VER}")
 file(GLOB TA_TORCH_SRC *.cpp)
 add_library(${TORCH_TARGET_NAME} SHARED "${TA_TORCH_SRC}")
 
+if (MSVC)
+  # Linking on windows requires all libraries
+  set(TENSORADAPTER_TORCH_LIBS ${TORCH_LIBRARIES})
+else()
+  set(TENSORADAPTER_TORCH_LIBS ${TORCH_LIBRARY})
+endif(MSVC)
+
 message(STATUS "tensoradapter found PyTorch includes: ${TORCH_INCLUDE_DIRS}")
-message(STATUS "tensoradapter found PyTorch lib: ${TORCH_LIBRARIES}")
+message(STATUS "tensoradapter found PyTorch lib: ${TENSORADAPTER_TORCH_LIBS}")
 
 target_include_directories(
   ${TORCH_TARGET_NAME} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../include")
@@ -36,6 +43,6 @@ target_include_directories(
   ${TORCH_TARGET_NAME} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../../third_party/dlpack/include")
 target_include_directories(
   ${TORCH_TARGET_NAME} PRIVATE "${TORCH_INCLUDE_DIRS}")
-target_link_libraries(${TORCH_TARGET_NAME} PRIVATE "${TORCH_LIBRARIES}")
+target_link_libraries(${TORCH_TARGET_NAME} PRIVATE "${TENSORADAPTER_TORCH_LIBS}")
 set_property(TARGET ${TORCH_TARGET_NAME} PROPERTY CXX_STANDARD 14)
 message(STATUS "Configured target ${TORCH_TARGET_NAME}")