[Bug ld/25458] --gc-sections removes _environ symbol since version 2.21

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25458

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Does this work?

diff --git a/bfd/elflink.c b/bfd/elflink.c
index 300be3f743..be9518fc4a 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -13148,7 +13148,15 @@ _bfd_elf_gc_mark_rsec (struct bfd_link_info *info,
asection *sec,
    dynamic reloc info on the non-weak definition for code
    handling copy relocs.  */
       if (h->is_weakalias)
-  weakdef (h)->mark = 1;
+  {
+    struct elf_link_hash_entry *hw = h->u.alias;
+    hw->mark = 1;
+    while (hw->is_weakalias)
+      {
+        hw = hw->u.alias;
+        hw->mark = 1;
+      }
+  }

       if (start_stop != NULL)
   {

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