* options.h (class General_options): Add -Bsymbolic-functions.

	* symtab.h (Symbol::is_preemptible): Check for
	-Bsymbolic-functions.

3 files changed, 39 insertions, 6 deletions

diff --git a/gold/ChangeLog b/gold/ChangeLog
index 3ae464f..358ec64 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,9 @@
+2008-05-06  Ian Lance Taylor  <iant@google.com>
+
+	* options.h (class General_options): Add -Bsymbolic-functions.
+	* symtab.h (Symbol::is_preemptible): Check for
+	-Bsymbolic-functions.
+
 2008-05-05  Ian Lance Taylor  <iant@google.com>
 
 	* options.h (DEFINE_bool): For DASH_Z, create the negative option
diff --git a/gold/options.h b/gold/options.h
index 0dd8221..9eb51ce 100644
--- a/gold/options.h
+++ b/gold/options.h
@@ -510,6 +510,9 @@ class General_options
   DEFINE_bool(Bsymbolic, options::ONE_DASH, '\0', false,
               N_("Bind defined symbols locally"), NULL);
 
+  DEFINE_bool(Bsymbolic_functions, options::ONE_DASH, '\0', false,
+	      N_("Bind defined function symbols locally"), NULL);
+
   DEFINE_optional_string(build_id, options::TWO_DASHES, '\0', "sha1",
 			 N_("Generate build ID note"),
 			 N_("[=STYLE]"));
diff --git a/gold/symtab.h b/gold/symtab.h
index 1ee3131..020f242 100644
--- a/gold/symtab.h
+++ b/gold/symtab.h
@@ -467,12 +467,36 @@ class Symbol
     // is preemptible.
     gold_assert(!this->is_undefined());
 
-    return (this->visibility_ != elfcpp::STV_INTERNAL
-            && this->visibility_ != elfcpp::STV_HIDDEN
-            && this->visibility_ != elfcpp::STV_PROTECTED
-            && !this->is_forced_local_
-            && parameters->options().shared()
-	    && !parameters->options().Bsymbolic());
+    // If a symbol does not have default visibility, it can not be
+    // seen outside this link unit and therefore is not preemptible.
+    if (this->visibility_ != elfcpp::STV_DEFAULT)
+      return false;
+
+    // If this symbol has been forced to be a local symbol by a
+    // version script, then it is not visible outside this link unit
+    // and is not preemptible.
+    if (this->is_forced_local_)
+      return false;
+
+    // If we are not producing a shared library, then nothing is
+    // preemptible.
+    if (!parameters->options().shared())
+      return false;
+
+    // If the user used -Bsymbolic, then nothing is preemptible.
+    if (parameters->options().Bsymbolic())
+      return false;
+
+    // If the user used -Bsymbolic-functions, then functions are not
+    // preemptible.  We explicitly check for not being STT_OBJECT,
+    // rather than for being STT_FUNC, because that is what the GNU
+    // linker does.
+    if (this->type() != elfcpp::STT_OBJECT
+	&& parameters->options().Bsymbolic_functions())
+      return false;
+
+    // Otherwise the symbol is preemptible.
+    return true;
   }
 
   // Return true if this symbol is a function that needs a PLT entry.