Re: [avr-gcc-list] Avoiding copy_data in config/avr/avr.c avr_file_start()?

[E. Weddington]

Ben Jackson wrote:

> I got the impression from libgcc.S that copy_data wouldn't exist if
> it wasn't needed, but I finally found in avr_file_start:
>
>  /* FIXME: output these only if there is anything in the .data / .bss
>     sections - some code size could be saved by not linking in the
>     initialization code from libgcc if one or both sections are empty.  */
>  fputs ("\t.global __do_copy_data\n", asm_out_file);
>  fputs ("\t.global __do_clear_bss\n", asm_out_file);
>
> I don't know gcc internals, so is this just not visible from
> avr_file_start, or just not yet done?  If someone gives me a hint I'll
> look into it.
>  
IIRC, this is documented as GCC bug #18145:
<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18145>
Well, technically it's an enhancement request.

Eric