Hi Christopher,
I’m sorry to inform you, but I was able to replicate your issue and we are going to update our documentation about it.
You can check the issue status here:
I did a test here with a docker image of ubuntu 18.04 that in theory is similar with your WSL version.
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Install necessary tools
apt update
apt install build-essential cmake gcc-multilib genromfs git make python python-dev python-empy python-future python-matplotlib python-numpy python-opencv python-pip python-pyparsing python-scipy python-serial python-setuptools sudo unzip wget xz-utils zip -
Download gcc-arm-none-eabi-4_9
wget http://firmware.ardupilot.org/Tools/STM32-tools/gcc-arm-none-eabi-4_9-2015q3-20150921-linux.tar.bz2
tar jxf gcc-arm-none-eabi-4_9-2015q3-20150921-linux.tar.bz2
export PATH=$PATH:$PWD/gcc-arm-none-eabi-4_9-2015q3/bin -
Configure and compile ArduSub-stable.
git clone https://github.com/ardupilot/ardupilot.git && cd ardupilot && git submodule update --init --recursive && git fetch --tags && git checkout ArduSub-stable && git submodule update --recursive && ./waf configure --board px4-v2 && ./waf build sub`