cmake : fix build warning when kleidiai is enabled (#20457)

* cmake : fix build warning when kleidiai is enabled

* remove LLAMA_ARG_THREADS from KleidiAI backend

diff --git a/ggml/src/ggml-cpu/CMakeLists.txt b/ggml/src/ggml-cpu/CMakeLists.txt
index 6ca3176a2f241f8f851f71b3e42de56a0e22706e..7c062a62995afaf09315e5c6d0cc3e69ad14f11c 100644 (file)
--- a/ggml/src/ggml-cpu/CMakeLists.txt
+++ b/ggml/src/ggml-cpu/CMakeLists.txt
@@ -570,24 +570,34 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
         set(KLEIDIAI_DOWNLOAD_URL "https://github.com/ARM-software/kleidiai/archive/refs/tags/${KLEIDIAI_COMMIT_TAG}.tar.gz")
         set(KLEIDIAI_ARCHIVE_MD5  "54049037570ab0ee0a0d126b2ba5ece1")
 
-        if (POLICY CMP0135)
-            cmake_policy(SET CMP0135 NEW)
-        endif()
-
-        # TODO: Use FetchContent_MakeAvailable with EXCLUDE_FROM_ALL after bumping minimum CMake version to 3.28+
-        # Using FetchContent_Populate instead to avoid EXCLUDE_FROM_ALL which requires CMake 3.28
-        FetchContent_Declare(KleidiAI_Download
+        set(KLEIDIAI_FETCH_ARGS
             URL ${KLEIDIAI_DOWNLOAD_URL}
             DOWNLOAD_EXTRACT_TIMESTAMP NEW
-            URL_HASH MD5=${KLEIDIAI_ARCHIVE_MD5})
+            URL_HASH MD5=${KLEIDIAI_ARCHIVE_MD5}
+        )
 
-        FetchContent_GetProperties(KleidiAI_Download
-            SOURCE_DIR  KLEIDIAI_SRC
-            POPULATED   KLEIDIAI_POPULATED)
+        if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.28")
+            FetchContent_Declare(KleidiAI_Download
+                ${KLEIDIAI_FETCH_ARGS}
+                EXCLUDE_FROM_ALL
+            )
 
-        if (NOT KLEIDIAI_POPULATED)
-            FetchContent_Populate(KleidiAI_Download)
+            FetchContent_MakeAvailable(KleidiAI_Download)
             FetchContent_GetProperties(KleidiAI_Download SOURCE_DIR KLEIDIAI_SRC)
+        else()
+            FetchContent_Declare(KleidiAI_Download
+                ${KLEIDIAI_FETCH_ARGS}
+            )
+
+            FetchContent_GetProperties(KleidiAI_Download
+                SOURCE_DIR KLEIDIAI_SRC
+                POPULATED KLEIDIAI_POPULATED
+            )
+
+            if (NOT KLEIDIAI_POPULATED)
+                FetchContent_Populate(KleidiAI_Download)
+                FetchContent_GetProperties(KleidiAI_Download SOURCE_DIR KLEIDIAI_SRC)
+            endif()
         endif()
 
         add_compile_definitions(GGML_USE_CPU_KLEIDIAI)