Hello!
I’d just trying to build master branch of ardupilot.
After commands
Waf configure - - board=omnibusf4pro
Waf plane
I have error message (on linkage stage I suppose) saying
region flash overflowed by 188 bytes
At the same time it compiles successfully for matek f405 wing board.
Could you please explain how to improve this 
Thanks
The reason was too much fonts.
After removing font4 everything went smoothly.
You may have an older compiler. Make sure you have the 6.3.1 compiler from here:
https://firmware.ardupilot.org/Tools/STM32-tools/
test by running: arm-none-eabi-g++ -v
It should show this:
gcc version 6.3.1 20170620 (release) [ARM/embedded-6-branch revision 249437] (GNU Tools for ARM Embedded Processors 6-2017-q2-update)
Thanks for Your reply.
I have exactly the same versions you posted
Well… Removing font4 resolve the problem
But reverting font4 initiate a problem again.