I have a project in SES 5.42a for the Nordic nRF52833 using SDK 17.1.0 on Windows. The project was started as an example project, which is the source of the directory structure.

I added compiler warning flags to Project Options->Code->Compiler->Additional C/C++ Compiler Options:
-Werror=strict-prototypes
-Werror=implicit-function-declaration
-Wall
-Wextra
-Wmissing-include-dirs
-Wswitch-default
-Wswitch-enum
-Wconversion

This works, but there's tons of warnings generated in Nordic library files. I'd like to suppress warnings on all the library files, while keeping warnings for new source files. I think the way to do this is with the -isystem or -I flags added to the Compiler Options (same spot in Project Options as the warning flags), but I haven't been able to get it to work. A few permutations that I've tried,

Doen't Suppress Warnings
-isystem$(ProjectDir)/../../../../../../components/libraries/scheduler/
-isystem $(ProjectDir)/../../../../../../components/libraries/scheduler/
-I$(ProjectDir)/../../../../../../components/libraries/scheduler/
-I $(ProjectDir)/../../../../../../components/libraries/scheduler/

Suppresses all warnings from all files (not just files the schedular folder)
-isystem \..\..\..\..\..\..\components\libraries\scheduler\

Thoughts on what I'm doing wrong, or another approach to generate warnings for only a subset of files/folders?

Thanks,
Scott