C++ coroutines and ANDROID flag

Issue

I'm trying to integrate a boost project using asio and coroutines on android. I use set(CMAKE_CXX_FLAGS "-fcoroutines-ts") on the CMakeLists.txt file (c++17 is used). When i set this flag the ANDROID macro becomes undefined. If i add -DANDROID then the coroutines get disabled. Are this two flags incompatible? Can i use c++ coroutines on Android with NDK?

Solution

By setting CMAKE_CXX_FLAGS you're overwriting the original value, which likely was set to include -DANDROID by the toolchain file you're using or CMake directly. There are two possibilities here:

• You can use add_compile_options("-fcoroutines-ts") instead, this will add the flag to all targets defined afterwards
• If only a single target makes use of coroutines you can also set it via target_compile_options(<target> PUBLIC "-fcoroutines-ts") or target_compile_options(<target> PRIVATE "-fcoroutines-ts") depending on whether you're using coroutines in public headers of that target (choose PUBLIC) or only in the implementation (choose PRIVATE).

Answered By - Corristo