I’ve created a newbie project and it seems it uses kinda out-dated to “arm-none-eabi-gcc” version:
arm-none-eabi-gcc.exe (GNU Tools for Arm Embedded Processors 7-2017-q4-major) 7.2.1 20170904 (release) [ARM/embedded-7-branch revision 255204]
Copyright © 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
How to update to the latest one https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads?
PlatformIO wizard offers a project based on “Zephyr RTOS”.
How to do a bare-metal (clean) project - no RTOS?