Hello EveryOne!
Could you please point me to concrete github place where I can suggest my changes to platfrormio_build.py for Arduino STM32Duino framework?
The file at windows is coated here .platformio\packages\framework-arduinoststm32\tools\
But I can’t find it not at Platfromio GitHub repo nor at STM32Duino GitHub repo 
Frameworks seem to be handled a little… differently… compared to platforms and other bits of PlatformIO. They are hosted on Bintray as downloadable packages, and in essence are just packages from the various source frameworks packaged consistently, all in one place on the Bintray CDN. However, as you’ve spotted, there are a few tweaks and extras.
i.e. the framework-arduinoststm32 package is here : Service End for Bintray, JCenter, GoCenter, and ChartCenter | JFrog … but it’s not a repo as such you can contribute to. Probably best to open an issue with the suggested changes on the platform-ststm32 repo, and point out that you can’t do a PR because the framework extras aren’t tracked.
Or am I understanding that wrong @ivankravets @valeros ?