dl symbol search path; Was: Corefile -arch 32 test failures with breakpoint and stacktrace tests

[Andrew Cagney <cagney at redhat dot com>]

Andrew Cagney wrote:
> > +    static Symbol get(Dwfl dwfl, String name)
> > +    {
> > +      Symbol sym = new Symbol();
> > +      sym.name = name;
> > +      DwflModule[] modules = dwfl.getModules();
> > +      for (int i = 0; i < modules.length && ! sym.found; i++)
> > +        modules[i].getSymbolByName(name, sym);
> > + 
PS:

The rules for looking up an elf symbol is, unfortunately, subtle and 
complex.  A brute force search through all the modules taking the first 
returned isn't correct.  For instance, consider a search for open.  If 
the current symbol scope has a local open function then that should be 
returned, and not the one from a library like glibc.  The man page for 
dlsym(3) touches on the semantics.

I was hoping that there was a dwfl method for doing this, but none jump 
out from libdwfl.h?  I see DwflModule.getSymbolByName does the best it 
can using dwfl_module_getsymtab.

Andrew