RE: [avr-gcc-list] minit-stack

[Weddington, Eric]

> -----Original Message-----
> From: Ruud Vlaming [mailto:address@hidden 
> Sent: Wednesday, October 22, 2008 10:43 AM
> To: Weddington, Eric; address@hidden
> Subject: Re: [avr-gcc-list] minit-stack
> 
> On Wednesday 22 October 2008 17:00, you wrote:
> > 
> > > -----Original Message-----
> > > From: 
> > > address@hidden 
> > > [mailto:address@hidden
> > > org] On Behalf Of Ruud Vlaming
> > > Sent: Wednesday, October 22, 2008 2:40 AM
> > > To: address@hidden
> > > Subject: [avr-gcc-list] minit-stack
> > > 
> > > On gcc 4.2.3 it was possible to use something like
> > > 
> > >   -minit-stack="xOS+xOSstackShift"
> > > 
> > 
> > <snip>
> > 
> > > Anyway, in gcc 4.3.2 it seems no longer be possible to use
> > > that compiler option. (I get an compiler error, although the 
> > > documentation
> > > of 4.3.2 still says it is allowed to use that option)
> > 
> > That's strange. AFAIK, nothing was ever *purposely* done to 
> remove that option.
> > 
> > Do you have any other versions of gcc in between the two to 
> test? Like 4.3.0, or 4.3.1?
> Yep, i build a new toolchain for 4.3.0 and it gives the same error:
> cc1: error: unrecognized command line option 
> "-minit-stack=xOS+xOSstackShift"
> 
> Also the built in help (avr-gcc -v --help) has the option 
> excluded, and, the main
> method does not include any stack settings any more (is used 
> to). Thus it looks
> like this has been removed on purpose.

Hmm. So you are correct. Here is the ChangeLog entry (see last item):

2007-10-26  Anatoly Sokolov <...>

        * config/avr/avr.c (avr_OS_task_function_p): Add new function.
        (avr_regs_to_save): Handle functions with 'OS_task' attribute.
        (avr_simple_epilogue, expand_prologue, avr_asm_function_end_prologue,
        expand_epilogue, output_movhi): Don't handle 'main' function.
        (avr_attribute_table): Add 'OS_task' function attribute.
        * config/avr/avr.h (machine_function): Remove 'is_main' field, add
        'is_OS_task' field.
        * config/avr/avr.md (return_from_main_epilogue): Remove insn.
        (return_from_epilogue, return_from_interrupt_epilogue): Don't handle
        'main' function.
        * config/avr/avr.opt (minit-stack): Remove.

Anatoly can you comment?