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...issue I found out that libc++ can be compiled with the flags: -D_LIBCPP_HAS_NO_STDOUT:BOOL=ON -D_LIBCPP_HAS_NO_STDIN:BOOL=ON so I gave it a try: I started a struggle to compile libc++ and libc++ ABI with ARMToolchain-9-2019-q4-major. Unfortunately, I failed. This is how I build libc++: TOOLCHAIN_ROOT_DIR="${HOME}/ARMToolchain-9-2019-q4-major" export CC="${TOOLCHAIN_ROOT_DIR}/bin/arm-none-eabi-gcc" export CXX="${TOOLCHAIN_ROOT_DIR}/bin/arm-none-eabi-g++" C_AND_CXX_COMMON_FLAGS_BASE="-mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard --specs=nosys.specs\ --sys...