Revamp the symbol lookup algorithm to cope better with objects

loaded separately by dlopen that have global symbols with identical
names.  Viewing each dlopened object as a DAG which is linked by its
DT_NEEDED entries in the dynamic table, the search order is as
follows:

  * If the referencing object was linked with -Bsymbolic, search it
    internally.
  * Search all dlopened DAGs containing the referencing object.
  * Search all objects loaded at program start up.
  * Search all objects which were dlopened() using the RTLD_GLOBAL
    flag (which is now supported too).

The search terminates as soon as a strong definition is found.
Lacking that, the first weak definition is used.

These rules match those of Solaris, as best I could determine them
from its vague manual pages and the results of experiments I performed.

PR:		misc/12438

1 files changed, 1 insertions, 2 deletions

diff --git a/libexec/rtld-elf/alpha/reloc.c b/libexec/rtld-elf/alpha/reloc.c
index 03d8c17..1b55d06 100644
--- a/libexec/rtld-elf/alpha/reloc.c
+++ b/libexec/rtld-elf/alpha/reloc.c
@@ -60,8 +60,7 @@ extern Elf_Dyn _DYNAMIC;
 
 /* Relocate a non-PLT object with addend. */
 static int
-reloc_non_plt_obj(Obj_Entry *obj_rtld, const Obj_Entry *obj,
-    const Elf_Rela *rela)
+reloc_non_plt_obj(Obj_Entry *obj_rtld, Obj_Entry *obj, const Elf_Rela *rela)
 {
 	Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rela->r_offset);