gold: Ignore def/ref from a dynamic object for special symbols

[deliverable/binutils-gdb.git] / gold / symtab.cc

diff --git a/gold/symtab.cc b/gold/symtab.cc
index 1555de6e5b3c3a9cef26ebfb23bd208105e0d9b5..d1f71e02d0edadb490b1b5fc51a46fba8bd56b35 100644 (file)
--- a/gold/symtab.cc
+++ b/gold/symtab.cc
@@ -1185,7 +1185,9 @@ Symbol_table::add_from_relobj(
       const char* name = sym_names + st_name;
 
       if (!parameters->options().relocatable()
-         && strcmp (name, "__gnu_lto_slim") == 0)
+         && name[0] == '_'
+         && name[1] == '_'
+         && strcmp (name + (name[2] == '_'), "__gnu_lto_slim") == 0)
         gold_info(_("%s: plugin needed to handle lto object"),
                  relobj->name().c_str());
 
@@ -1759,6 +1761,7 @@ template<int size, bool big_endian>
 Sized_symbol<size>*
 Symbol_table::define_special_symbol(const char** pname, const char** pversion,
                                    bool only_if_ref,
+                                   elfcpp::STV visibility,
                                     Sized_symbol<size>** poldsym,
                                    bool* resolve_oldsym, bool is_forced_local)
 {
@@ -1797,8 +1800,21 @@ Symbol_table::define_special_symbol(const char** pname, const char** pversion,
       oldsym = this->lookup(*pname, *pversion);
       if (oldsym == NULL && is_default_version)
        oldsym = this->lookup(*pname, NULL);
-      if (oldsym == NULL || !oldsym->is_undefined())
+      if (oldsym == NULL)
        return NULL;
+      if (!oldsym->is_undefined())
+       {
+         // Skip if the old definition is from a regular object.
+         if (!oldsym->is_from_dynobj())
+           return NULL;
+
+         // If the symbol has hidden or internal visibility, ignore
+         // definition and reference from a dynamic object.
+         if ((visibility == elfcpp::STV_HIDDEN
+              || visibility == elfcpp::STV_INTERNAL)
+             && !oldsym->in_reg())
+           return NULL;
+       }
 
       *pname = oldsym->name();
       if (is_default_version)
@@ -1973,7 +1989,9 @@ Symbol_table::do_define_in_output_data(
     {
 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
       sym = this->define_special_symbol<size, true>(&name, &version,
-                                                   only_if_ref, &oldsym,
+                                                   only_if_ref,
+                                                   visibility,
+                                                   &oldsym,
                                                    &resolve_oldsym,
                                                    is_forced_local);
 #else
@@ -1984,7 +2002,9 @@ Symbol_table::do_define_in_output_data(
     {
 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
       sym = this->define_special_symbol<size, false>(&name, &version,
-                                                    only_if_ref, &oldsym,
+                                                    only_if_ref,
+                                                    visibility,
+                                                    &oldsym,
                                                     &resolve_oldsym,
                                                     is_forced_local);
 #else
@@ -2092,7 +2112,9 @@ Symbol_table::do_define_in_output_segment(
     {
 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
       sym = this->define_special_symbol<size, true>(&name, &version,
-                                                   only_if_ref, &oldsym,
+                                                   only_if_ref,
+                                                   visibility,
+                                                   &oldsym,
                                                    &resolve_oldsym,
                                                    is_forced_local);
 #else
@@ -2103,7 +2125,9 @@ Symbol_table::do_define_in_output_segment(
     {
 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
       sym = this->define_special_symbol<size, false>(&name, &version,
-                                                    only_if_ref, &oldsym,
+                                                    only_if_ref,
+                                                    visibility,
+                                                    &oldsym,
                                                     &resolve_oldsym,
                                                     is_forced_local);
 #else
@@ -2209,7 +2233,9 @@ Symbol_table::do_define_as_constant(
     {
 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
       sym = this->define_special_symbol<size, true>(&name, &version,
-                                                   only_if_ref, &oldsym,
+                                                   only_if_ref,
+                                                   visibility,
+                                                   &oldsym,
                                                    &resolve_oldsym,
                                                    is_forced_local);
 #else
@@ -2220,7 +2246,9 @@ Symbol_table::do_define_as_constant(
     {
 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
       sym = this->define_special_symbol<size, false>(&name, &version,
-                                                    only_if_ref, &oldsym,
+                                                    only_if_ref,
+                                                    visibility,
+                                                    &oldsym,
                                                     &resolve_oldsym,
                                                     is_forced_local);
 #else
@@ -2447,7 +2475,9 @@ Symbol_table::add_undefined_symbol_from_command_line(const char* name)
     {
 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
       sym = this->define_special_symbol<size, true>(&name, &version,
-                                                   false, &oldsym,
+                                                   false,
+                                                   elfcpp::STV_DEFAULT,
+                                                   &oldsym,
                                                    &resolve_oldsym,
                                                    false);
 #else
@@ -2458,7 +2488,9 @@ Symbol_table::add_undefined_symbol_from_command_line(const char* name)
     {
 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
       sym = this->define_special_symbol<size, false>(&name, &version,
-                                                    false, &oldsym,
+                                                    false,
+                                                    elfcpp::STV_DEFAULT,
+                                                    &oldsym,
                                                     &resolve_oldsym,
                                                     false);
 #else