[Prism54-devel] New FreeMAC snapshot

[Denis Vlasenko]

Hi Seb,

> > However, after some searches on the web, I found a hack to strip dead 
> > code with GNU ld. I have committed the modified version. Can you check 
> > it still works with your PCI card, since I had to modify the linker 
> > script?
> 
> Just downloaded, unmodified tarball:
> -rwxr-xr-x  1 root root 11852 Oct  3 09:33 freemac.arm
> 
> I added bogus call to sscanf, requiring sscanf to be linked in:
> -rwxr-xr-x  1 root root 13424 Oct  3 09:35 freemac.arm
> 
> So it really works.
> 
> However, if I replace Makefile and freemac.lds by ones from
> older tarball, I get smaller image:
> -rwxr-xr-x  1 root root  9524 Oct  3 09:41 freemac.arm
> 
> And when I also completely #ifdef out sscanf from libc.c:
> -rwxr-xr-x  1 root root  8216 Oct  3 09:44 freemac.arm

After little objdumping I found out that it's just a bss
being put in wrong place. With this freemac.lds:

OUTPUT_ARCH(arm)
ENTRY(head)
SECTIONS {
   .text : {
      boot.o(.text)
      *(.text)
      *(.rodata*)
      . = ALIGN(4);
   }
   .data : {
      *(.data*)
      . = ALIGN(4);
   }
   .bss : {
      *(.bss*)
      . = ALIGN(4);
   }
}

I am getting the smallest image:

-rwxr-xr-x  1 root root  7484 Oct  3 12:05 freemac.arm

(BTW... do we zero out bss as we should?)
--
vda