Upgrade cmake_minimum_required version for ndk r27?

[Galasnow]

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When building ncnn for target "arm64-v8a" with Android ndk r27 (27.0.12077973), error occurs:

PS D:\ZYZ\ncnn_20240717\build_android_aarch64> cmake -G "Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=D:\Android\SDK\ndk\27.0.12077973/build/cmake/android.toolchain.cmake -DCMAKE_MAKE_PROGRAM="D:\Android\SDK\ndk\27.0.12077973/prebuilt/windows-x86_64/bin/make.exe" -DANDROID_ABI="arm64-v8a" -DANDROID_PLATFORM=android-29 -DNCNN_VULKAN=ON  ..
-- CMAKE_TOOLCHAIN_FILE = D:/Android/SDK/ndk/27.0.12077973/build/cmake/android.toolchain.cmake
-- CMAKE_INSTALL_PREFIX = D:/ZYZ/ncnn_20240717/build_android_aarch64/install
-- NCNN_VERSION_STRING = 1.0.20240718
CMake Deprecation Warning at CMakeLists.txt:24 (cmake_minimum_required):
  Compatibility with CMake < 3.5 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- The C compiler identification is Clang 18.0.1
-- The CXX compiler identification is Clang 18.0.1
CMake Warning (dev) at D:/Android/SDK/ndk/27.0.12077973/build/cmake/flags.cmake:46 (if):
  Policy CMP0057 is not set: Support new IN_LIST if() operator.  Run "cmake
  --help-policy CMP0057" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning.

  IN_LIST will be interpreted as an operator when the policy is set to NEW.
  Since the policy is not set the OLD behavior will be used.
Call Stack (most recent call first):
  D:/cmake-3.30.0-windows-x86_64/share/cmake-3.30/Modules/Platform/Android-Clang.cmake:23 (include)
  D:/cmake-3.30.0-windows-x86_64/share/cmake-3.30/Modules/Platform/Android-Clang-C.cmake:1 (include)
  D:/cmake-3.30.0-windows-x86_64/share/cmake-3.30/Modules/CMakeCInformation.cmake:48 (include)
  CMakeLists.txt:39 (project)
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Error at D:/Android/SDK/ndk/27.0.12077973/build/cmake/flags.cmake:46 (if):
  if given arguments:

    "hwaddress" "IN_LIST" "ANDROID_SANITIZE"

  Unknown arguments specified
Call Stack (most recent call first):
  D:/cmake-3.30.0-windows-x86_64/share/cmake-3.30/Modules/Platform/Android-Clang.cmake:23 (include)
  D:/cmake-3.30.0-windows-x86_64/share/cmake-3.30/Modules/Platform/Android-Clang-C.cmake:1 (include)
  D:/cmake-3.30.0-windows-x86_64/share/cmake-3.30/Modules/CMakeCInformation.cmake:48 (include)
  CMakeLists.txt:39 (project)


-- Configuring incomplete, errors occurred!

It seems that upgrading cmake_minimum_required version to 3.3 or higher is the simplest solution, but I don't know exactly if this affects other targets or not.
Reference: android/ndk#2032

[Galasnow]

I'm sorry that I didn't notice PR #1429. I wish cmake version have been upgraded on these embedded systems ):

[nihui]

cmake -DCMAKE_POLICY_DEFAULT_CMP0057=NEW -DCMAKE_TOOLCHAIN_FILE=XXXXX should work

[Galasnow]

It's an accurate solution. Should I modify the CMakeList.txt or the doc?