ggml : fix arm enabled features check

Author: slaren

ggml/src/ggml-cpu/CMakeLists.txt

@@ -135,14 +135,20 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
             endif()
 
             # show enabled features
+            if (CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
+                set(FEAT_INPUT_FILE "NUL")
+            else()
+                set(FEAT_INPUT_FILE "/dev/null")
+            endif()
+
             execute_process(
                 COMMAND ${CMAKE_C_COMPILER} ${ARCH_FLAGS} -dM -E -
-                INPUT_FILE "/dev/null"
+                INPUT_FILE ${FEAT_INPUT_FILE}
                 OUTPUT_VARIABLE ARM_FEATURE
                 RESULT_VARIABLE ARM_FEATURE_RESULT
             )
             if (ARM_FEATURE_RESULT)
-                message(FATAL_ERROR "Failed to get ARM features")
+                message(WARNING "Failed to get ARM features")
             else()
                 foreach(feature DOTPROD SVE MATMUL_INT8 FMA FP16_VECTOR_ARITHMETIC)
                     string(FIND "${ARM_FEATURE}" "__ARM_FEATURE_${feature} 1" feature_pos)