ROS2 for Win32 (x86): How to make colcon call cmake without "Win64"?

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Hi,

for a couple of days now, I've been trying to compile ROS2 for x86 under Windows. Because of other dependecies, I can't use x64. I tried a lot of stuff on my Windows 10 64bit machine that didn't work (i.e. recompile all necessary stuff for x86 and so on).

Now I'm working in a vanilla Windows 10 32bit VM and one problem seems to be, that I colcon always calls cmake with "Visual Studio 15 2017 Win64" and I can't change that. I tried calling colcon witn "--cmake-args -DCMAKE_CXX_FLAGS=-m32" which did not work either.

What I did on the vanilla Win10 32bit VM:

• install all prerequisites in: https://index.ros.org/doc/ros2/Instal...
• do all the steps from here: https://index.ros.org/doc/ros2/Instal...
• (of course I installed 32bit versions of OpenSSL, Qt, and compiled a 32bit version of OpenCV).

My questions are:

1. What is the best way to compile ROS2 for Win32?
2. How do I make colcon call cmake with "Visual Studio 15 2017" without "Win64"?

Thank you very much

Marossa