Fix handling of __ehdr_start when it cannot be defined.

2014-05-02  Cary Coutant  <ccoutant@google.com>

	* defstd.cc (in_segment): Define __ehdr_start here...
	* layout.cc (Layout::finalize): ...Instead of here.  Set the
	output segment when known.
	* resolve.cc (Symbol::override_base_with_special): Remember
	the original binding.
	* symtab.cc (Symbol::set_output_segment): New function.
	(Symbol::set_undefined): New function.
	* symtab.h (Symbol::is_weak_undefined): Check original undef
	binding.
	(Symbol::is_strong_undefined): New function.
	(Symbol::set_output_segment): New function.
	(Symbol::set_undefined): New function.
	* target-reloc.h (is_strong_undefined): Remove.
	(issue_undefined_symbol_error): Call Symbol::is_weak_undefined.
	Check for hidden undefs.
	(relocate_section): Call Symbol::is_strong_undefined.

	* testsuite/Makefile.am (ehdr_start_test_1)
	(ehdr_start_test_2, ehdr_start_test_3)
	(ehdr_start_test_4, ehdr_start_test_5): New test cases.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/ehdr_start_def.cc: New source file.
	* testsuite/ehdr_start_test.cc: New source file.
	* testsuite/ehdr_start_test.t: New linker script.
	* testsuite/ehdr_start_test_4.sh: New shell script.

1 files changed, 25 insertions, 0 deletions

diff --git a/gold/symtab.cc b/gold/symtab.cc
index 1a69f5b..4e8afb1 100644
--- a/gold/symtab.cc
+++ b/gold/symtab.cc
@@ -527,6 +527,31 @@ Symbol::set_output_section(Output_section* os)
     }
 }
 
+// Set the symbol's output segment.  This is used for pre-defined
+// symbols whose segments aren't known until after layout is done
+// (e.g., __ehdr_start).
+
+void
+Symbol::set_output_segment(Output_segment* os, Segment_offset_base base)
+{
+  gold_assert(this->is_predefined_);
+  this->source_ = IN_OUTPUT_SEGMENT;
+  this->u_.in_output_segment.output_segment = os;
+  this->u_.in_output_segment.offset_base = base;
+}
+
+// Set the symbol to undefined.  This is used for pre-defined
+// symbols whose segments aren't known until after layout is done
+// (e.g., __ehdr_start).
+
+void
+Symbol::set_undefined()
+{
+  gold_assert(this->is_predefined_);
+  this->source_ = IS_UNDEFINED;
+  this->is_predefined_ = false;
+}
+
 // Class Symbol_table.
 
 Symbol_table::Symbol_table(unsigned int count,