Export of sample program to CMake will not compile

Windows 10 OS, latest mbed cli release.

mbed import https://github.com/ARMmbed/mbed-os-example-blinky
cd mbed-os-example-blinky
mbed export --target NUCLEO_F411RE --ide cmake_gcc_arm
mkdir out
cd out
cmake .. -G Ninja -DCMAKE_TOOLCHAIN_FILE=C:\source\repos\arm-cmake-toolchains\arm-gcc-toolchain.cmake -DCMAKE_BUILD_TYPE=Debug

The toolchain file just sets the ARM GCC location. Compile fails with the three most recent ARM GCC toolchain releases
7-2017-q4-major
arm-none-eabi-g++.exe: error: unrecognized command line option '-rdynamic'

8-2018-q4-major (this looks like an ARM compiler bug, there are related issues filed)
arm-none-eabi-objcopy: mbed-os-example-blinky.hex 64-bit address 0x4b4fa308000000 out of range for Intel Hex file

8-2019-q3-update
arm-none-eabi-g++.exe: error: unrecognized command line option '-rdynamic'

I can find no way to control where the -rdymaic flag is being inserted here. I don't see anything in the CMakeLists.txt setting that.

The other thing is why is a blink sample pulling in the world to compile? This takes over 10 mins to compile before hitting the error in linking.