libdl: Add symbol searching and loading from archives.

- Load archive symbol tables to support searching of archives
  for symbols.
- Search archive symbols and load the object file that contains
  the symbol.
- Search the global and archives until all remaining unresolved symbols
  are not found. Group the loaded object files in the pending queue.
- Run the object file and loaded dependents as a group before adding to the
  main object list.
- Remove orphaned object files after references are removed.

Updates #3686

1 files changed, 14 insertions, 2 deletions

diff --git a/cpukit/libdl/rtl-elf.c b/cpukit/libdl/rtl-elf.c
index 762130b9e7..caa37e6bab 100644
--- a/cpukit/libdl/rtl-elf.c
+++ b/cpukit/libdl/rtl-elf.c
@@ -248,6 +248,13 @@ rtems_rtl_elf_reloc_relocator (rtems_rtl_obj*      obj,
     }
 
     sobj = rtems_rtl_find_obj_with_symbol (symbol);
+
+    if (rtems_rtl_trace (RTEMS_RTL_TRACE_DEPENDENCY))
+      printf ("rtl: depend: %s -> %s:%s\n",
+              obj->oname,
+              sobj == NULL ? "not-found" : sobj->oname,
+              symname);
+
     if (sobj != NULL)
     {
       if (rtems_rtl_obj_add_dependent (obj, sobj))
@@ -471,6 +478,13 @@ rtems_rtl_obj_relocate_unresolved (rtems_rtl_unresolv_reloc* reloc,
   }
 
   sobj = rtems_rtl_find_obj_with_symbol (sym);
+
+  if (rtems_rtl_trace (RTEMS_RTL_TRACE_DEPENDENCY))
+    printf ("rtl: depend: %s -> %s:%s\n",
+            reloc->obj->oname,
+            sobj == NULL ? "not-found" : sobj->oname,
+            sym->name);
+
   if (sobj != NULL)
   {
     if (rtems_rtl_obj_add_dependent (reloc->obj, sobj))
@@ -1274,8 +1288,6 @@ rtems_rtl_elf_file_load (rtems_rtl_obj* obj, int fd)
   if (!rtems_rtl_obj_relocate (obj, fd, rtems_rtl_elf_relocs_locator, &ehdr))
     return false;
 
-  rtems_rtl_obj_synchronize_cache (obj);
-
   rtems_rtl_symbol_obj_erase_local (obj);
 
   if (!rtems_rtl_elf_load_linkmap (obj))