Add -h/-soname option.

gold/layout.cc

@@ -1713,6 +1713,13 @@ Layout::finish_dynamic_section(const Input_objects* input_objects,
       odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname());
     }
 
+  if (parameters->output_is_shared())
+    {
+      const char* soname = this->options_.soname();
+      if (soname != NULL)
+	odyn->add_string(elfcpp::DT_SONAME, soname);
+    }
+
   // FIXME: Support --init and --fini.
   Symbol* sym = symtab->lookup("_init");
   if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj())

gold/options.cc

@@ -399,6 +399,9 @@ options::Command_line_options::options[] =
                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
+  GENERAL_ARG('h', "soname", N_("Set shared library name"),
+	      N_("-h FILENAME, --soname FILENAME"), ONE_DASH,
+	      &General_options::set_soname),
   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 	      N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 	      &General_options::set_dynamic_linker),
@@ -528,6 +531,7 @@ const int options::Command_line_options::debug_options_size =
 
 General_options::General_options()
   : export_dynamic_(false),
+    soname_(NULL),
     dynamic_linker_(NULL),
     search_path_(),
     optimization_level_(0),

gold/options.h

@@ -113,6 +113,11 @@ class General_options
   export_dynamic() const
   { return this->export_dynamic_; }
 
+  // -h: shared library name.
+  const char*
+  soname() const
+  { return this->soname_; }
+
   // -I: dynamic linker name.
   const char*
   dynamic_linker() const
@@ -310,6 +315,10 @@ class General_options
   set_export_dynamic()
   { this->export_dynamic_ = true; }
 
+  void
+  set_soname(const char* arg)
+  { this->soname_ = arg; }
+
   void
   set_dynamic_linker(const char* arg)
   { this->dynamic_linker_ = arg; }
@@ -501,6 +510,7 @@ class General_options
   add_sysroot();
 
   bool export_dynamic_;
+  const char* soname_;
   const char* dynamic_linker_;
   Dir_list search_path_;
   int optimization_level_;