Building Cmake for Android from Windows

Posted on Sat 12 January 2019 in Review

Calling this little batch file from inside a library folder which has a CMakeLists.txt has done a decent job of building some useful C++ libraries.

set android_sdk=C:\Craftwork\Android\sdk
set cmake_dir=%android_sdk%\cmake\
set ndk_dir=%android_sdk%\ndk-bundle
set platform=16

set cxx-flags="-fexceptions -frtti -std=c++17 -Wno-format-security"
set build_dir_prefix=libs-android-ndk

for %%x in (x86 arm64-v8a x86_64) do  (
%cmake_dir%\bin\cmake.exe ^
    -H. ^
    -B%build_dir_prefix%\%%x ^
    -DANDROID_ABI=%%x ^
    -DANDROID_STL=c++_shared ^
    -DANDROID_PLATFORM=android-%platform% ^
    -DCMAKE_BUILD_TYPE=Release ^
    -DANDROID_NDK=%ndk_dir% ^
    -DCMAKE_CXX_FLAGS=%cxx-flags% ^
    -DCMAKE_SYSTEM_VERSION=%platform% ^
    -DCMAKE_ANDROID_NDK=%ndk_dir% ^
    -DCMAKE_TOOLCHAIN_FILE=%ndk_dir%\build\cmake\android.toolchain.cmake ^
    -G Ninja ^

%cmake_dir%\bin\cmake.exe --build %build_dir_prefix%\%%x

Tweak the 4 variables at the start to match your environment. The commandline is largly inspired from CMake | Android NDK. But note the line

-G Ninja

above as opposed to

-GAndroid Gradle - Ninja

Yeah, they changed the generator name at some point in the move from CMake 3.6 to 3.10 and never updated the docuentation. That was a fun one to figure out. If you are still on cmake 3.6 then use the second form.

Working libraries.

I haven't tried this with many libraries. For me this works with

Some build as static libraries, others as shared.