Change cmake version (#8666)

Change cmake version from 3.16 to 3.18

1. Change the CMakeList's minimum require version.

2. Change the describtion document of cmake version.

Resolves: milvus-io#8407
Signed-off-by: NShen Zhi <m13120163046@163.com>

README.md

@@ -79,7 +79,7 @@ Check the requirements first.
 
 ```bash
 go: 1.15
-cmake: >=3.16
+cmake: >=3.18
 gcc: 7.5
 ```
 

internal/core/CMakeLists.txt

@@ -11,7 +11,7 @@
 # or implied. See the License for the specific language governing permissions and limitations under the License.
 #-------------------------------------------------------------------------------
 
-cmake_minimum_required( VERSION 3.14 )
+cmake_minimum_required( VERSION 3.18 )
 
 add_definitions(-DELPP_THREAD_SAFE)
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)

internal/core/src/index/CMakeLists.txt

@@ -11,7 +11,7 @@
 # or implied. See the License for the specific language governing permissions and limitations under the License.
 #-------------------------------------------------------------------------------
 
-cmake_minimum_required(VERSION 3.12)
+cmake_minimum_required(VERSION 3.18)
 message(STATUS "------------------------------KNOWHERE-----------------------------------")
 message(STATUS "Building using CMake version: ${CMAKE_VERSION}")
 

internal/kv/rocksdb/cwrapper/CMakeLists.txt

-cmake_minimum_required(VERSION 3.14...3.17 FATAL_ERROR)
+cmake_minimum_required( VERSION 3.18 )
 project(wrapper)
 
 set(CMAKE_CXX_STANDARD 17)

internal/storage/cwrapper/CMakeLists.txt

@@ -9,7 +9,7 @@
 # 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.
 
-cmake_minimum_required(VERSION 3.14...3.17 FATAL_ERROR)
+cmake_minimum_required( VERSION 3.18 )
 project(wrapper)
 
 set(CMAKE_CXX_STANDARD 17)

internal/util/dablooms/cwrapper/CMakeLists.txt

@@ -9,7 +9,7 @@
 # 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.
 
-cmake_minimum_required(VERSION 3.14...3.17 FATAL_ERROR)
+cmake_minimum_required( VERSION 3.18 )
 project(dablooms)
 
 set(CMAKE_CXX_STANDARD 17)

scripts/README.md

@@ -5,7 +5,7 @@
 ```
     OS: Ubuntu 18.04
     go：1.15
-    cmake: >=3.16
+    cmake: >=3.18
     gcc： 7.5
 ```