Building ROS 2 Java for Android on Windows fails

[mpconte]

After following the instructions on the README, on the colcon build step (in the x64 Native Tools Command Prompt for VS 2019 as the ROS2 documentation describes), I receive the following error when building fastcdr:

--- stderr: fastcdr
CMake Error at C:/Program Files/CMake/share/cmake-3.22/Modules/CMakeTestCCompiler.cmake:69 (message):
  The C compiler

    "D:/Android/Sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: D:/ros2_android_ws/build/fastcdr/CMakeFiles/CMakeTmp

    Run Build Command(s):C:/Program Files (x86)/Microsoft Visual Studio/2019/Professional/MSBuild/Current/Bin/MSBuild.exe cmTC_e48db.vcxproj /p:Configuration=Debug /p:Platform=x64 /p:VisualStudioVersion=16.0 /v:m && Microsoft (R) Build Engine version 16.11.2+f32259642 for .NET Framework
    Copyright (C) Microsoft Corporation. All rights reserved.

      ANDROID_HOME=
      ANT_HOME=
      JAVA_HOME=
      NDK_ROOT=
      testCCompiler.c
    clang : error : unknown argument: '-gcc-toolchain' [D:\ros2_android_ws\build\fastcdr\CMakeFiles\CMakeTmp\cmTC_e48db.vcxproj]
    clang : error : no such file or directory: '\toolchains\x86_64-4.9\prebuilt\windows' [D:\ros2_android_ws\build\fastcdr\CMakeFiles\CMake