cmake:add gemmlowp CMake build

Signed-off-by: renzhiyuan1 <renzhiyuan1@xiaomi.com>

Author: renzhiyuan1

math/gemmlowp/CMakeLists.txt

@@ -0,0 +1,46 @@
+# ##############################################################################
+# apps/math/gemmlowp/CMakeLists.txt
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+if(CONFIG_MATH_GEMMLOWP)
+
+  # ############################################################################
+  # Config and Fetch gemmlowp lib
+  # ############################################################################
+
+  set(GEMMLOWP_DIR ${CMAKE_CURRENT_LIST_DIR}/gemmlowp)
+
+  if(NOT EXISTS ${GEMMLOWP_DIR})
+    set(GEMMLOWP_URL
+        https://github.com/google/gemmlowp/archive/719139ce755a0f31cbf1c37f7f98adcc7fc9f425.zip
+    )
+    FetchContent_Declare(
+      gemmlowp_fetch
+      URL ${GEMMLOWP_URL} SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/gemmlowp
+          BINARY_DIR ${CMAKE_BINARY_DIR}/apps/math/gemmlowp/gemmlowp
+      DOWNLOAD_NO_PROGRESS true
+      TIMEOUT 30)
+
+    FetchContent_GetProperties(gemmlowp_fetch)
+
+    if(NOT gemmlowp_fetch_POPULATED)
+      FetchContent_Populate(gemmlowp_fetch)
+    endif()
+  endif()
+endif()