Re: Performance issue with GNU/ld and DLL

[Pascal Obry <pascal at obry dot net>]

Nick,

First thanks for your answer.

I have identified the slowness. This is because in pe-dll.c we have:

<<
static int
auto_export (bfd *abfd, def_file *d, const char *n)
{
  int i;
  struct exclude_list_struct *ex;
  const autofilter_entry_type *afptr;
  const char * libname = 0;
  if (abfd && abfd->my_archive)
    libname = lbasename (abfd->my_archive->filename);

  for (i = 0; i < d->num_exports; i++)
    if (strcmp (d->exports[i].name, n) == 0)
      return 0;
  ...
>>

Removing the above loop the code runs has fast for building executable
than for building DLL. Just looking at the code it is clear that we have
an O(nÂ) performance issue. For each export we look at all currently
exports to see if it has not yet been handled!

A solution would be to use a hash table or something like that. What
would you advise (I do not know well the binutils sources), I'm willing
to try fixing this issue.

Thanks,
Pascal.

-- 

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