PIC24 port C compiler options

demanzano wrote on Thursday, March 11, 2010:


I’m using FreeRTOS 6.0.3 on a PIC24H using Microchip C30 v3.23.
Since this is my first project with FreeRTOS I’m trying to follow documentation instructions, so currently my C30 command line options are:

-g -Wall -DMPLAB_PIC24_PORT -O2 -fno-omit-frame-pointer -merrata=exch  -mlarge-data  -fno-schedule-insns -fno-schedule-insns2

My question is: why exactly are needed the “no omit frame pointer” and “no-schedule-insns/2” options ? I’m guessing about the first one but the latest puzzle me…

Thanks for your kind answers to my curiosity :wink:


A. de Manzano

rtel wrote on Thursday, March 11, 2010:

I don’t know about the no-schedule-insns/2 option, maybe that is just a default setting.  The -fno-omit-frame-pointer I think dates back to a time when there was a bug in the compiler and is **probably ** not actually needed now.


demanzano wrote on Saturday, March 13, 2010:

Ok, fair enough :))
I’ll try removing them and make some (simple) test. IMVHO they are all unneeded. As you say, probabily are some old setting (for sure they are not defaults for C30 v3.xx).
Thanks again

demanzano wrote on Thursday, March 25, 2010:

I’ld just add that after a couple of weeks of develop and tests I can confirm there are no particular compiler options required, at least using C30 v3.23.