[binutils-gdb/binutils-2_25-branch] Fix garbage collection of common symbols for powerpc64

[Alan Modra]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c1b7d37c0d6bd15b1a154aef0c764a4350dd0f22

commit c1b7d37c0d6bd15b1a154aef0c764a4350dd0f22
Author: Alan Modra <amodra@gmail.com>
Date:   Tue Jan 20 11:06:28 2015 +1030

    Fix garbage collection of common symbols for powerpc64
    
    I forgot powerpc64 has its own gc_mark_dynamic_ref.
    
    	PR ld/17615
    	* elf64-ppc.c (ppc64_elf_gc_mark_dynamic_ref): Don't drop
    	ELF_COMMON_DEF syms.

Diff:
---
 bfd/ChangeLog   | 5 +++++
 bfd/elf64-ppc.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 0300b59..cba389e 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,6 +1,11 @@
 2015-02-11  Alan Modra  <amodra@gmail.com>
 
 	Apply from master.
+	2015-01-20  Alan Modra  <amodra@gmail.com>
+	PR ld/17615
+	* elf64-ppc.c (ppc64_elf_gc_mark_dynamic_ref): Don't drop
+	ELF_COMMON_DEF syms.
+
 	2015-01-19  Alan Modra  <amodra@gmail.com>
 	PR 17165
 	* elf-bfd.h (ELF_COMMON_DEF_P): Note that this might be true for
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index 88ae80c..318f41a 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -6232,7 +6232,7 @@ ppc64_elf_gc_mark_dynamic_ref (struct elf_link_hash_entry *h, void *inf)
   if ((eh->elf.root.type == bfd_link_hash_defined
        || eh->elf.root.type == bfd_link_hash_defweak)
       && (eh->elf.ref_dynamic
-	  || (eh->elf.def_regular
+	  || ((eh->elf.def_regular || ELF_COMMON_DEF_P (&eh->elf))
 	      && ELF_ST_VISIBILITY (eh->elf.other) != STV_INTERNAL
 	      && ELF_ST_VISIBILITY (eh->elf.other) != STV_HIDDEN
 	      && (!info->executable