+
+ {
+ /* The following chunk of code tries to identify jump stubs in
+ import libraries which are dead code and eliminates them
+ from the final link. For each exported symbol <sym>, there
+ is a object file in the import library with a .text section
+ and several .idata\$* sections. The .text section contains the
+ symbol definition for <sym> which is a jump stub of the form
+ jmp *__imp_<sym>. The .idata\$5 contains the symbol definition
+ for __imp_<sym> which is the address of the slot for <sym> in
+ the import address table. When a symbol is imported explicitly
+ using __declspec(dllimport) declaration, the compiler generates
+ a reference to __imp_<sym> which directly resolves to the
+ symbol in .idata\$5, in which case the jump stub code is not
+ needed. The following code tries to identify jump stub sections
+ in import libraries which are not referred to by anyone and
+ marks them for exclusion from the final link. */
+ LANG_FOR_EACH_INPUT_STATEMENT (is)
+ {
+ if (is->the_bfd->my_archive)
+ {
+ int is_imp = 0;
+ asection *sec, *stub_sec = NULL;
+
+ /* See if this is an import library thunk. */
+ for (sec = is->the_bfd->sections; sec; sec = sec->next)
+ {
+ if (strncmp (sec->name, ".idata\$", 7) == 0)
+ is_imp = 1;
+ /* The section containing the jmp stub has code
+ and has a reloc. */
+ if ((sec->flags & SEC_CODE) && sec->reloc_count)
+ stub_sec = sec;
+ }
+
+ if (is_imp && stub_sec)
+ {
+ asymbol **symbols;
+ long nsyms, src_count;
+ struct bfd_link_hash_entry * blhe;
+
+ if (!bfd_generic_link_read_symbols (is->the_bfd))
+ {
+ einfo (_("%B%F: could not read symbols: %E\n"),
+ is->the_bfd);
+ return;
+ }
+ symbols = bfd_get_outsymbols (is->the_bfd);
+ nsyms = bfd_get_symcount (is->the_bfd);
+
+ for (src_count = 0; src_count < nsyms; src_count++)
+ {
+ if (symbols[src_count]->section->id == stub_sec->id)
+ {
+ /* This symbol belongs to the section containing
+ the stub. */
+ blhe = bfd_link_hash_lookup (link_info.hash,
+ symbols[src_count]->name,
+ FALSE, FALSE, TRUE);
+ /* If the symbol in the stub section has no other
+ undefined references, exclude the stub section
+ from the final link. */
+ if (blhe && (blhe->type == bfd_link_hash_defined)
+ && (blhe->u.undef.next == NULL))
+ stub_sec->flags |= SEC_EXCLUDE;
+ }
+ }
+ }
+ }
+ }
+ }