Androidstudio Rebuilds Everything Every Time If Multiple Abis Are Supported

If I build my AndroidStudio for one ABI, it works as expected. If I support two ABIs, say for 'armeabi-v7a' and 'arm64-v8a', then Android Studio will rebuild every file, every time

Solution 1:

This was caused by the fact that the build variants all had the same output directory for the .o files.

You need to split out the build directory into release/debug and into the different ABIs.

The way to do this, is by using the CMAKE_CURRENT_BINARY_DIR macro as such:

set( gpgoap_src_DIR $ENV{HOME}/src/GPGOAP )
add_subdirectory( ${gpgoap_src_DIR}${CMAKE_CURRENT_BINARY_DIR}/gpgoap )

If you do this, then the arm7 debug object files will end up in: app/.externalNativeBuild/cmake/debug/armeabi-v7a so they will not clash with other ABIs.

Note that you cannot re-use output directories, so you do need to postfix them for each add_subdirectory() that you do.

One final remark: the cmake documentation says that the output directory is optional for add_subdirectory() but I found this not to be the case. You need to supply it at least two arguments.