Inconsistent .eh_frame_hdr on powerpc64

[Alan Modra]

There is code in bfd/elf-eh-frame.c and ld/emultempl/elf32.em that
checks for the presence of eh_frame info by testing for a section
named .eh_frame sized more than 8 bytes.   The size test is to exclude
a zero terminator.  A similar check in elf64-ppc.c wrongly just tested
for non-zero size before creating the linker generated .eh_frame
describing plt call and other linkage stubs.  The intention was to not
generate that info unless there was some user .eh_frame.  (No user
.eh_frame implies the user doesn't care about exception handling.)
Because the test in elf64-ppc.c was wrong, ld generated the stub
.eh_frame just on finding a zero .eh_frame terminator in crtend.o, but
didn't generate the corresponding .eh_frame_hdr.

	* elf64-ppc.c (ppc64_elf_size_stubs): Correct test for user
	.eh_frame info.

diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index 181bbdc..31ee412 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -12700,7 +12700,7 @@ ppc64_elf_size_stubs (struct bfd_link_info *info)
 
       if (htab->glink_eh_frame != NULL
 	  && !bfd_is_abs_section (htab->glink_eh_frame->output_section)
-	  && htab->glink_eh_frame->output_section->size != 0)
+	  && htab->glink_eh_frame->output_section->size > 8)
 	{
 	  size_t size = 0, align = 4;
 

-- 
Alan Modra
Australia Development Lab, IBM