Fix failure in exception_static_test.

Because the __EH_FRAME_BEGIN__ symbol is provided in an empty .eh_frame
section in crtbeginT.o, if crt1.o has a non-empty .eh_frame section,
we place all optimized .eh_frame sections into the output section ahead
of the __EH_FRAME_BEGIN__ symbol, which breaks EH for statically-linked
binaries.

This patch fixes the problem by delaying the attachment of the optimized
.eh_frame sections to the output section until we see the end marker
section (or to the end of pass 1 if we never see an end marker).

gold/
	PR gold/14675
	* ehframe.cc (Eh_frame::add_ehframe_input_section): Change return type;
	return enum indicating whether .eh_frame section is empty, optimizable,
	unrecognized, or an end marker. Adjust explicit instantiations.
	* ehframe.h (Eh_frame::Eh_frame_section_disposition): New enum type.
	(Eh_frame::add_ehframe_input_section): Change return type.
	* gold.cc (queue_middle_tasks): Call Layout::finalize_eh_frame_section.
	* layout.cc (Layout::layout_eh_frame): Don't add optimized sections
	to the .eh_frame output section until we see the end marker.
	(Layout::finalize_eh_frame_section): New.
	* layout.h: (Layout::finalize_eh_frame_section): New.

1 files changed, 6 insertions, 0 deletions

diff --git a/gold/layout.h b/gold/layout.h
index aec0c53..9039ee8 100644
--- a/gold/layout.h
+++ b/gold/layout.h
@@ -635,6 +635,12 @@ class Layout
 		  unsigned int reloc_shndx, unsigned int reloc_type,
 		  off_t* offset);
 
+  // After processing all input files, we call this to make sure that
+  // the optimized .eh_frame sections have been added to the output
+  // section.
+  void
+  finalize_eh_frame_section();
+
   // Add .eh_frame information for a PLT.  The FDE must start with a
   // 4-byte PC-relative reference to the start of the PLT, followed by
   // a 4-byte size of PLT.