Toolchain: Block installation of prebuilt libtorch when enabling MKL (deepmodeling#7525)

* Toolchain: Block installation of prebuilt libtorch when enabling MKL

* Remove dead CMake logic

Author: Growl1234

CMakeLists.txt

@@ -691,11 +691,7 @@ if(ENABLE_MLALGO OR DEFINED Torch_DIR)
     set_if_higher(CMAKE_CXX_STANDARD 14)
   endif()
   include_directories(${TORCH_INCLUDE_DIRS})
-  if(MKL_FOUND)
-    list(PREPEND math_libs ${TORCH_LIBRARIES})
-  else()
-    list(APPEND math_libs ${TORCH_LIBRARIES})
-  endif()
+  list(APPEND math_libs ${TORCH_LIBRARIES})
   add_compile_options(${TORCH_CXX_FLAGS})
 endif()
 

toolchain/scripts/lib/config_manager.sh

@@ -567,6 +567,11 @@ config_apply_env_logic() {
             echo "Using MKL, so fftw is disabled."
             CONFIG_CACHE["with_fftw"]="__DONTUSE__"
         fi
+        if [ "${CONFIG_CACHE[with_libtorch]}" = "__INSTALL__" ]; then
+            report_error ${LINENO} \
+                "Installing the current prebuilt libtorch package is disabled for oneMKL builds due to known conflicts between bundled and externally linked oneMKL libraries. Please provide a compatible libtorch installation via --with-libtorch=system or --with-libtorch=<path>."
+            exit 1
+        fi
     fi
 
     # Select the correct compute number based on the GPU architecture