Re: [gccsdk] Some feedback on using GCC 10.2.0

On 03/08/2021 21:12, John Tytgat wrote:
> On 8/3/21 9:21 PM, Lee Noar wrote:
>> ISTR that FPA floating point couldn't be used in modules, something to
>> do with modules running in SVC mode and FPA instructions being emulated.
>
> I don't think that's the case (anymore?). The PS3 driver (which was btw
> developed with gccsdk 4) is using FPA floating point code and works fine
> on RISC OS 4/5 (well we did find a nasty and tricky FPEmulator stack
> related problem which got eventually fixed).

Ah, ok, perhaps I'm relying on an old memory there.

>> That may be difficult to get implemented in the DDE C compiler! But, yes
>> that would mean that APCS-32 support wouldn't have to be added to GCC 10
>> just to support modules.
>
> ..and also for normal applications using the SharedCLibrary, right ?

Yes.

> I've longtime lost my believe that we should try to keep on using
> APCS-32 (https://www.riscos.info/pipermail/gcc/2012-October/005856.html)
> for building RO code.

What you describe with regards to stack handling is pretty much what
I've done with GCC 10 and the ARMEABISupport module.

> And would it really be that difficult to support
> EABI in the DDE C compiler or is this just speculation ?

Just speculation, I was thinking more along the lines of someone with
access to the source having the motivation to add such support rather
than the technicalities of altering the code generation.

Lee.

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