A completely different approach to EH runtime

[Zack Weinberg]

On Fri, Feb 23, 2001 at 02:31:12PM -0800, Richard Henderson wrote:
> On Fri, Feb 23, 2001 at 01:53:25PM -0800, Zack Weinberg wrote:
> > Put a global symbol _in the executable_ which the libgcc
> > routines look for.
> 
> A good idea ...
> 
> > Except that there are funnies with whether or not symbols in the
> > executable are visible to dynamically loaded objects.  Drat.
> 
> ... except for this small detail.  :-/

Hm.  ld(1) says

       -export-dynamic
              When  creating  an ELF file, add all symbols to the
              dynamic symbol table.  Normally, the dynamic symbol
              table contains only symbols which are used by a dy-
              namic object.  This option is needed for some  uses
              of dlopen.

That implies, to me, that there might be a way to force just one
symbol into the dynamic symbol table.  I know very little about this.
Worst case (in ELF), couldn't we bodge an entry into .dynsym by hand?

zw