Allow multiple .eh_frame sections per object file.

LLVM is experimenting with placing .eh_frame sections in the COMDAT group
with the function's text. This triggers an internal error in gold because
we don't expect to see but one .eh_frame section in an object, and we use
a single data member in class Sized_relobj_file to keep track of that section.

This patch removes that data member, and instead checks the output section
and the input section offset to identify an optimized .eh_frame section.

gold/
	* object.h (class Sized_relobj_file): Remove discarded_eh_frame_shndx_.
	* object.cc (Sized_relobj_file::Sized_relobj_file): Likewise.
	(Sized_relobj_file::layout_eh_frame_section): Likewise.
	(Sized_relobj_file::do_count_local_symbols): Check for optimized
	.eh_frame section by other means.
	(Sized_relobj_file::compute_final_local_value_internal): Likewise.

1 files changed, 0 insertions, 3 deletions

diff --git a/gold/object.h b/gold/object.h
index 508e79cb3c0..59915d9b47b 100644
--- a/gold/object.h
+++ b/gold/object.h
@@ -2842,9 +2842,6 @@ class Sized_relobj_file : public Sized_relobj<size, big_endian>
   Kept_comdat_section_table kept_comdat_sections_;
   // Whether this object has a GNU style .eh_frame section.
   bool has_eh_frame_;
-  // If this object has a GNU style .eh_frame section that is discarded in
-  // output, record the index here.  Otherwise it is -1U.
-  unsigned int discarded_eh_frame_shndx_;
   // True if the layout of this object was deferred, waiting for plugin
   // replacement files.
   bool is_deferred_layout_;