Re: New backend

On Wed, 2025-12-31 at 11:02 +0100, BERTRAND Joël via Gcc-help wrote:
> Segher Boessenkool a écrit :
> 
> 	As I obtain errors or segmentation fault, I have tried in a first time
> to port gcc/config/m6809 from gcc 4.3 to 15.2. Of course, build process
> returns a lot of errors. I have fixed a lot of errors but some poisoned
> defineds resist.
> 
> 	RETURN_POPS_ARGS
> 	FUNCTION_ARG_ADVANCE
> 	FUNCTION_ARG
> 	TRAMPOLINE_TEMPLATE
> 	INITIALIZE_TRAMPOLINE
> 	LEGITIMATE_CONSTANT_P
> 	LEGITIMIZE_ADDRESS
> 	GO_IF_MODE_DEPENDENT_ADDRESS
> 	FIXUNS_TRUNC_LIKE_FIX_TRUNC
> 	FLOAT_TYPE_SIZE
> 	TRULY_NOOP_TRUNCATION
> 	NOTICE_UPDATE_CC
> 
> 	I can send a tarball (63 KB) but is there somewhere a document to port
> a backend from gcc 4.3 to recent gcc ?


My suggestion would be to make intermediate ports to older versions of GCC, starting from GCC 12.5 or even the unmaintained GCC 10.

If you want to get quickly a non-optimizing C compiler for that target, you could consider porting https://nwcc.sourceforge.net/
or https://github.com/TinyCC

(maybe that was could also increase your compiler writer abilities).

In France you could consider porting compcert.org (it requires some Ocaml skills)

Regards
-- 

Basile STARYNKEVITCH                    basile AT starynkevitch DOT net
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