[Hardware][CPU] compressed-tensor INT8 W8A8 AZP support (#9344)

cmake/cpu_extension.cmake

@@ -1,5 +1,8 @@
+include(FetchContent)
+
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS ON)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-set(CMAKE_CXX_STANDARD 17)
 
 #
 # Define environment variables for special configurations
@@ -82,15 +85,40 @@ else()
     message(FATAL_ERROR "vLLM CPU backend requires AVX512 or AVX2 or Power9+ ISA support.")
 endif()
 
+#
+# Build oneDNN for W8A8 GEMM kernels (only for x86-AVX512 platforms)
+#
+if (AVX512_FOUND AND NOT AVX512_DISABLED)
+    FetchContent_Declare(
+        oneDNN
+        GIT_REPOSITORY https://github.com/oneapi-src/oneDNN.git
+        GIT_TAG  v3.5.3
+        GIT_PROGRESS TRUE
+        GIT_SHALLOW TRUE
+    )
+
+    set(ONEDNN_LIBRARY_TYPE "STATIC")
+    set(ONEDNN_BUILD_DOC "OFF")
+    set(ONEDNN_BUILD_EXAMPLES "OFF")
+    set(ONEDNN_BUILD_TESTS "OFF")
+    set(ONEDNN_ENABLE_WORKLOAD "INFERENCE")
+    set(ONEDNN_ENABLE_PRIMITIVE "MATMUL;REORDER")
+    set(ONEDNN_BUILD_GRAPH "OFF")
+    set(ONEDNN_ENABLE_JIT_PROFILING "OFF")
+    set(ONEDNN_ENABLE_ITT_TASKS "OFF")
+    set(ONEDNN_ENABLE_MAX_CPU_ISA "OFF")
+    set(ONEDNN_ENABLE_CPU_ISA_HINTS "OFF")
+    set(CMAKE_POLICY_DEFAULT_CMP0077 NEW)
+
+    FetchContent_MakeAvailable(oneDNN)
+    
+    list(APPEND LIBS dnnl)
+endif()
+
 message(STATUS "CPU extension compile flags: ${CXX_COMPILE_FLAGS}")
 
 list(APPEND LIBS numa)
 
-# Appending the dnnl library for the AVX2 and AVX512, as it is not utilized by Power architecture.
-if (AVX2_FOUND OR AVX512_FOUND)
-    list(APPEND LIBS dnnl)
-endif()
-
 #
 # _C extension
 #