[binutils-gdb/binutils-2_25-branch] Don't create .eh_frame_hdr on shared lib bfd

[Alan Modra <amodra at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=e5edeec54c859d3e072fc324ff39fcaf185754fb

commit e5edeec54c859d3e072fc324ff39fcaf185754fb
Author: Alan Modra <amodra@gmail.com>
Date:   Wed Dec 24 22:07:42 2014 +1030

    Don't create .eh_frame_hdr on shared lib bfd
    
    If no object files have .eh_frame, but some shared library does, then
    ld creates a .eh_frame_hdr section using the shared library bfd.  This
    is silly since shared library .eh_frame sections don't contribute to
    the output .eh_frame and thus no .eh_frame_hdr is needed.
    
    Also, the bfd section list and count is cleared for shared libraries,
    and a zero section count used as a flag in lang_check to omit a call
    to bfd_merge_private_bfd_data for shared libraries.  If we create a
    section on a shared lib bfd then ld will wrongly attempt to merge the
    shared library private bfd data.
    
    	PR 17742
    	* ld/emultempl/elf32.em (gld${EMULATION_NAME}_after_open): Exclude
    	shared libraries in loop looking for .eh_frame sections.
    	Similarly for build-id loop.

Diff:
---
 ld/ChangeLog          | 5 +++++
 ld/emultempl/elf32.em | 5 ++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 8945a09..c51672d 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,6 +1,11 @@
 2015-02-11  Alan Modra  <amodra@gmail.com>
 
 	Apply from master.
+	2014-12-24  Alan Modra  <amodra@gmail.com>
+	* emultempl/elf32.em (gld${EMULATION_NAME}_after_open): Exclude
+	shared libraries in loop looking for .eh_frame sections.
+	Similarly for build-id loop.
+
 	2014-12-23  Alan Modra  <amodra@gmail.com>
 	* ldexp.c (exp_fold_tree_1 <etree_provide>): Test linker_def.
 
diff --git a/ld/emultempl/elf32.em b/ld/emultempl/elf32.em
index 137446f..36dee8e 100644
--- a/ld/emultempl/elf32.em
+++ b/ld/emultempl/elf32.em
@@ -1015,7 +1015,8 @@ gld${EMULATION_NAME}_after_open (void)
       /* Find an ELF input.  */
       for (abfd = link_info.input_bfds;
 	   abfd != (bfd *) NULL; abfd = abfd->link.next)
-	if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
+	if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
+	    && bfd_count_sections (abfd) != 0)
 	  break;
 
       /* PR 10555: If there are no ELF input files do not try to
@@ -1053,6 +1054,8 @@ gld${EMULATION_NAME}_after_open (void)
 
       for (abfd = link_info.input_bfds; abfd; abfd = abfd->link.next)
 	{
+	  if (bfd_count_sections (abfd) == 0)
+	    continue;
 	  if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
 	    elfbfd = abfd;
 	  if (!warn_eh_frame)