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Re: Large data sections support
On Sun, Jun 12, 2005 at 05:01:42PM -0700, Zack Weinberg wrote:
> "H. J. Lu" <hjl@lucon.org> writes:
>
> > On Mon, Jun 13, 2005 at 01:22:00AM +0200, Jan Hubicka wrote:
> >> >
> >> > Putting it in .lbss won't work with common symbol. But the default
> >> > gp size is 8, "sym->st_size > elf_gp_size (abfd))" means any common
> >> > symbols bigger than 8 bytes will be put in .lbss automatically by
> >> > default. I am not sure if it will work very well with the existing
> >>
> >> I see, this patch was hanging around longer than it should so I now
> >> hardly recall details. The treshold for bss/lbss is specified by ABI
> >> (as different units must match on relocations used to symbols anyway),
> >> so I planned hardwiring in the proper default for elf_gp_size but my
> >> last patch simply added -G parameter in ld execution command from gcc
> >> SPECs.
> >
> > The issue is that the existing relocatable files may have old
> > relocations against common symbols larger than 8 bytes, expecting
> > those symbols will be in .bss sections. Will it still work with your
> > scheme?
>
> Shouldn't the threshold for putting stuff in the .l sections be very
> high? Like, megabytes?
Can we assume no one uses MB common symbols on x86_64 today? I am not
sure we can.
H.J.