From: Alan Modra <amodra@gmail.com>
Date: Wed, 24 Dec 2014 11:37:42 +0000 (+1030)
Subject: Don't create .eh_frame_hdr on shared lib bfd
X-Git-Tag: gdb-7.9.0-release~231
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ca0694adf6d128c2feba16f6374954c191fb5edb;p=external%2Fbinutils.git

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 --git a/ld/ChangeLog b/ld/ChangeLog
index 0b2f058..31eb04e 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,9 @@
+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  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* emultempl/avrelf.em: Add include of elf/avr.h.
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)