How to import project having my own toolchain and makefile - using features of Eclipse?

[StaffanBr]

Hello,

I have a C-project for an ARM MCU that compiles without problem outside Eclipse.
Now I would like to bring the project into Eclipse and CDT using my current toolchain and makefile, but use the nice features of Eclipse (showing inactive code, info when hovering, quick jumping, indexer - the lot).

After trying various ways of creating projects (File/New/C/C++ Project) without being able to configure properties correctly, I turn here.

Is there anywhere documentation for doing what I want to do? Have tried the eclipse documentation at https://help.eclipse.org/2025-09/index.jsp, but it doesn't seem to tell the whole story at my level (yes, probably also TLDR).

It would be great to find somewhere explanations on how to get the indexer etc working on the code I have. It's probably not necessary to use the compiler I have in my toolchain as long as most of the information can be extracted using some other toolchain that may be downloaded in the package?

Any explanations for all the parameters that can be entered under Options/Builder, C/C++ Builder and C/C++ General would be great.

I use Eclipse 2025-09 (Eclipse IDE for Embedded C/C++ Developers).

Regards,
Staffan