* resolve.cc (Symbol_table::resolve): Remember whether undef was

	weak when resolving to a dynamic def.
	(Symbol_table::should_override): Add adjust_dyndef flag; set it
	for weak undef/dynamic def cases. Adjust callers.
	* symtab.cc (Symbol::init_fields): Initialize undef_binding_set_ and
	undef_binding_weak_.
	(Symbol_table::sized_write_globals): Adjust symbol binding.
	(Symbol_table::sized_write_symbol): Add binding parameter.
	* symtab.h (Symbol::set_undef_binding): New method.
	(Symbol::is_undef_binding_weak): New method.
	(Symbol::undef_binding_set_, Symbol::undef_binding_weak_): New members.
	(Symbol_table::should_override): Add new parameter.
	(Symbol_table::sized_write_symbol): Add new parameter.

	* testsuite/weak_undef_file1.cc: Add new test case.
	* testsuite/weak_undef_file2.cc: Fix header comment.
	* testsuite/weak_undef_test.cc: Add new test case.

1 files changed, 47 insertions, 10 deletions

diff --git a/gold/resolve.cc b/gold/resolve.cc
index 8b1c321..af3d489 100644
--- a/gold/resolve.cc
+++ b/gold/resolve.cc
@@ -335,18 +335,33 @@ Symbol_table::resolve(Sized_symbol<size>* to,
                                          sym.get_st_type());
 
   bool adjust_common_sizes;
+  bool adjust_dyndef;
   typename Sized_symbol<size>::Size_type tosize = to->symsize();
   if (Symbol_table::should_override(to, frombits, OBJECT, object,
-				    &adjust_common_sizes))
+				    &adjust_common_sizes,
+				    &adjust_dyndef))
     {
+      elfcpp::STB tobinding = to->binding();
       this->override(to, sym, st_shndx, is_ordinary, object, version);
       if (adjust_common_sizes && tosize > to->symsize())
         to->set_symsize(tosize);
+      if (adjust_dyndef)
+	{
+	  // We are overriding an UNDEF or WEAK UNDEF with a DYN DEF.
+	  // Remember which kind of UNDEF it was for future reference.
+	  to->set_undef_binding(tobinding);
+	}
     }
   else
     {
       if (adjust_common_sizes && sym.get_st_size() > tosize)
         to->set_symsize(sym.get_st_size());
+      if (adjust_dyndef)
+	{
+	  // We are keeping a DYN DEF after seeing an UNDEF or WEAK UNDEF.
+	  // Remember which kind of UNDEF it was.
+	  to->set_undef_binding(sym.get_st_bind());
+	}
       // The ELF ABI says that even for a reference to a symbol we
       // merge the visibility.
       to->override_visibility(sym.get_st_visibility());
@@ -381,9 +396,11 @@ Symbol_table::resolve(Sized_symbol<size>* to,
 bool
 Symbol_table::should_override(const Symbol* to, unsigned int frombits,
                               Defined defined, Object* object,
-			      bool* adjust_common_sizes)
+			      bool* adjust_common_sizes,
+			      bool* adjust_dyndef)
 {
   *adjust_common_sizes = false;
+  *adjust_dyndef = false;
 
   unsigned int tobits;
   if (to->source() == Symbol::IS_UNDEFINED)
@@ -531,12 +548,17 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
       return false;
 
     case UNDEF * 16 + DYN_DEF:
-    case WEAK_UNDEF * 16 + DYN_DEF:
     case DYN_UNDEF * 16 + DYN_DEF:
     case DYN_WEAK_UNDEF * 16 + DYN_DEF:
       // Use a dynamic definition if we have a reference.
       return true;
 
+    case WEAK_UNDEF * 16 + DYN_DEF:
+      // When overriding a weak undef by a dynamic definition,
+      // we need to remember that the original undef was weak.
+      *adjust_dyndef = true;
+      return true;
+
     case COMMON * 16 + DYN_DEF:
     case WEAK_COMMON * 16 + DYN_DEF:
     case DYN_COMMON * 16 + DYN_DEF:
@@ -554,12 +576,17 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
       return false;
 
     case UNDEF * 16 + DYN_WEAK_DEF:
-    case WEAK_UNDEF * 16 + DYN_WEAK_DEF:
     case DYN_UNDEF * 16 + DYN_WEAK_DEF:
     case DYN_WEAK_UNDEF * 16 + DYN_WEAK_DEF:
       // Use a weak dynamic definition if we have a reference.
       return true;
 
+    case WEAK_UNDEF * 16 + DYN_WEAK_DEF:
+      // When overriding a weak undef by a dynamic definition,
+      // we need to remember that the original undef was weak.
+      *adjust_dyndef = true;
+      return true;
+
     case COMMON * 16 + DYN_WEAK_DEF:
     case WEAK_COMMON * 16 + DYN_WEAK_DEF:
     case DYN_COMMON * 16 + DYN_WEAK_DEF:
@@ -570,12 +597,16 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
 
     case DEF * 16 + UNDEF:
     case WEAK_DEF * 16 + UNDEF:
-    case DYN_DEF * 16 + UNDEF:
-    case DYN_WEAK_DEF * 16 + UNDEF:
     case UNDEF * 16 + UNDEF:
       // A new undefined reference tells us nothing.
       return false;
 
+    case DYN_DEF * 16 + UNDEF:
+    case DYN_WEAK_DEF * 16 + UNDEF:
+      // For a dynamic def, we need to remember which kind of undef we see.
+      *adjust_dyndef = true;
+      return false;
+
     case WEAK_UNDEF * 16 + UNDEF:
     case DYN_UNDEF * 16 + UNDEF:
     case DYN_WEAK_UNDEF * 16 + UNDEF:
@@ -591,8 +622,6 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
 
     case DEF * 16 + WEAK_UNDEF:
     case WEAK_DEF * 16 + WEAK_UNDEF:
-    case DYN_DEF * 16 + WEAK_UNDEF:
-    case DYN_WEAK_DEF * 16 + WEAK_UNDEF:
     case UNDEF * 16 + WEAK_UNDEF:
     case WEAK_UNDEF * 16 + WEAK_UNDEF:
     case DYN_UNDEF * 16 + WEAK_UNDEF:
@@ -604,6 +633,12 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
       // A new weak undefined reference tells us nothing.
       return false;
 
+    case DYN_DEF * 16 + WEAK_UNDEF:
+    case DYN_WEAK_DEF * 16 + WEAK_UNDEF:
+      // For a dynamic def, we need to remember which kind of undef we see.
+      *adjust_dyndef = true;
+      return false;
+
     case DEF * 16 + DYN_UNDEF:
     case WEAK_DEF * 16 + DYN_UNDEF:
     case DYN_DEF * 16 + DYN_UNDEF:
@@ -811,10 +846,12 @@ bool
 Symbol_table::should_override_with_special(const Symbol* to, Defined defined)
 {
   bool adjust_common_sizes;
+  bool adjust_dyn_def;
   unsigned int frombits = global_flag | regular_flag | def_flag;
   bool ret = Symbol_table::should_override(to, frombits, defined, NULL,
-					   &adjust_common_sizes);
-  gold_assert(!adjust_common_sizes);
+					   &adjust_common_sizes,
+					   &adjust_dyn_def);
+  gold_assert(!adjust_common_sizes && !adjust_dyn_def);
   return ret;
 }