cmake : fix sycl build (#9469)

* try fix sycl build

* use CMAKE_CXX_FLAGS as a string variable

---------

Co-authored-by: Georgi Gerganov <[email protected]>

Author: Xarbirus

ggml/src/CMakeLists.txt

@@ -539,8 +539,7 @@ if (GGML_SYCL)
         add_compile_definitions(GGML_SYCL_FORCE_MMQ)
     endif()
 
-    add_link_options   (-fsycl)
-    add_compile_options(-fsycl -Wno-narrowing)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-narrowing -fsycl")
 
     if (GGML_SYCL_TARGET STREQUAL "NVIDIA")
         add_compile_definitions(GGML_SYCL_WARP_SIZE=32)
@@ -575,10 +574,13 @@ if (GGML_SYCL)
         if (GGML_SYCL_TARGET STREQUAL "INTEL")
             list(APPEND GGML_EXTRA_LIBS OpenCL mkl_core pthread m dl mkl_sycl_blas mkl_intel_ilp64 mkl_tbb_thread)
         elseif (GGML_SYCL_TARGET STREQUAL "NVIDIA")
-            add_compile_options(-fsycl-targets=nvptx64-nvidia-cuda)
+            list(APPEND CMAKE_CXX_FLAGS -fsycl-targets=nvptx64-nvidia-cuda)
             list(APPEND GGML_EXTRA_LIBS pthread m dl onemkl)
         endif()
     endif()
+    if (${DNNL_FOUND} AND GGML_SYCL_TARGET STREQUAL "INTEL")
+        list(APPEND GGML_EXTRA_LIBS DNNL::dnnl)
+    endif()
 endif()
 
 if (GGML_RPC)