question about linker

[sean yang]

Hi
I am looking for the source code related to linking stage--coz I am trying 
to modify (very slightly) the linker. I understand that 'ld' is the linker 
in Linux. My question is:
Is 'ld' a part of gcc toolchain?
--If it is, I should be able to find source file producing 'ld'. But I 
haven't found the source file to be compiled to 'ld'.
--If it's not, main() of gcc.c should invoke ld if it found the '-o' option. 
But I didn't find the invocation either(maybe it's not a straightforward 
invocation).

Can someone show me where should I start to investigate it? Thanks a lot,

Shuo

Here is something I thought related, but I think it is not directly related 
to linking stage.
6615       if (! strcmp (linker_name_spec, "collect2"))
  6616     {
  6617       char *s = find_a_file (&exec_prefixes, "collect2", X_OK, 0);
  6618       if (s == NULL)
  6619         linker_name_spec = "ld";
  6620     }

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