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Don't create .eh_frame_hdr on shared lib bfd

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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${EMULATION_NAME}_after_open): Exclude
	shared libraries in loop looking for .eh_frame sections.
	Similarly for build-id loop.
This commit is contained in:
Alan Modra 2014-12-24 22:07:42 +10:30
parent 854399ea9d
commit ca0694adf6
2 changed files with 10 additions and 1 deletions
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6
ld/ChangeLog
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@ -1,3 +1,9 @@
2014-12-24 Alan Modra <amodra@gmail.com>
* emultempl/elf32.em (gld${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.

5
ld/emultempl/elf32.em
View File

@ -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)