Startup files - porting builds between SES and GCC

[NickT]

Sorry in advance if this is an FAQ or maybe two

Situation is this - for regulatory reasons, production/release software here is built using a known version of arm-gcc, and has been built on SDK14.2 up to now.

I need to start a new project - (re-using some previous source), but ported to SDK15.3  IMHO The SES IDE is very helpful during code development, so I want to use it, but I will be forced to export back to GCC "make" for testing and pre-production. (PITA.)

I know I am conflating two issues here (update the SDK, and port between build environments), but I don't believe SES was supported until SDK15 anyway.

So - here's the problem, the SES "new project" wizard, and the SES examples in SDK15.3 have very different startup, linker and system files than the GCC production makefiles that I already have. 

Now - the peripheral examples in SDK15.3 seem to be configured to use the gcc compiler but don't use the gcc_startup_nrf52.s etc. files.

Is there perhaps an idiot's guide to the files in the IAR/GCC/ARM, and SES options in nrfx/mdk?  Compare and contrast? "An SES build will use x,y and z, but a GCC make project will need A and B instead)

Thanks for any/all advice.

[NickT]

Thanks for the prompt response. 

What advice would you have about the contents of nRF5_SDK_15.3.0_59ac345\modules\nrfx\mdk which contains multiple variants of assembler startup files. Which ones go with SES versus gcc versus ARM (I can ignore IAR for now.)

Also, SES ignored all those and attached its own versions to my project when I set up a new project from scratch...

BR

[awneil]

As noted, SES uses GCC - so its setup files are GCC files!

You can point the project at whatever files you like, and the  IDE will just pass them to the underlying (GCC) tools.

I guess the Segger ones might have some extra stuff related to RTT and/or background debug - but that's all compiler agnostic.

[haakonsh]

Segger has their own startup files, but it is ofc GCC. 
The nRF52832 uses ses_startup_nrf52.s, ses_startup_nrf_common, and system_nrf52.c