The "main" package is not special if -fgo-prefix is used.

From-SVN: r169986

gcc/go/gofrontend/gogo-tree.cc

@@ -161,7 +161,7 @@ Gogo::get_init_fn_name()
   if (this->init_fn_name_.empty())
     {
       gcc_assert(this->package_ != NULL);
-      if (this->package_name() == "main")
+      if (this->is_main_package())
 	{
 	  // Use a name which the runtime knows.
 	  this->init_fn_name_ = "__go_init_main";
@@ -186,7 +186,7 @@ Gogo::get_init_fn_name()
 void
 Gogo::init_imports(tree* init_stmt_list)
 {
-  gcc_assert(this->package_name() == "main");
+  gcc_assert(this->is_main_package());
 
   if (this->imported_init_fns_.empty())
     return;
@@ -384,7 +384,7 @@ Gogo::write_initialization_function(tree fndecl, tree init_stmt_list)
 {
   // Make sure that we thought we needed an initialization function,
   // as otherwise we will not have reported it in the export data.
-  gcc_assert(this->package_name() == "main" || this->need_init_fn_);
+  gcc_assert(this->is_main_package() || this->need_init_fn_);
 
   if (fndecl == NULL_TREE)
     fndecl = this->initialization_function_decl();
@@ -648,7 +648,7 @@ Gogo::write_globals()
   tree init_fndecl = NULL_TREE;
   tree init_stmt_list = NULL_TREE;
 
-  if (this->package_name() == "main")
+  if (this->is_main_package())
     this->init_imports(&init_stmt_list);
 
   // A list of variable initializations.
@@ -804,7 +804,7 @@ Gogo::write_globals()
   // This will be called if this package is imported.
   if (init_stmt_list != NULL_TREE
       || this->need_init_fn_
-      || this->package_name() == "main")
+      || this->is_main_package())
     this->write_initialization_function(init_fndecl, init_stmt_list);
 
   // Pass everything back to the middle-end.
@@ -1259,7 +1259,7 @@ Function::get_or_make_decl(Gogo* gogo, Named_object* no, tree id)
 		   && !this->type_->is_method())
 	    ;
 	  else if (Gogo::unpack_hidden_name(no->name()) == "main"
-		   && gogo->package_name() == "main")
+		   && gogo->is_main_package())
 	    TREE_PUBLIC(decl) = 1;
 	  // Methods have to be public even if they are hidden because
 	  // they can be pulled into type descriptors when using

gcc/go/gofrontend/gogo.cc

@@ -33,6 +33,7 @@ Gogo::Gogo(int int_type_size, int pointer_size)
     init_fn_name_(),
     imported_init_fns_(),
     unique_prefix_(),
+    unique_prefix_specified_(false),
     interface_types_()
 {
   const source_location loc = BUILTINS_LOCATION;
@@ -259,7 +260,7 @@ Gogo::set_package_name(const std::string& package_name,
   // package name (e.g., P.x), but we no longer do.
   // this->globals_->add_package(package_name, this->package_);
 
-  if (package_name == "main")
+  if (this->is_main_package())
     {
       // Declare "main" as a function which takes no parameters and
       // returns no value.
@@ -270,6 +271,15 @@ Gogo::set_package_name(const std::string& package_name,
     }
 }
 
+// Return whether this is the "main" package.  This is not true if
+// -fgo-prefix was used.
+
+bool
+Gogo::is_main_package() const
+{
+  return this->package_name() == "main" && !this->unique_prefix_specified_;
+}
+
 // Import a package.
 
 void
@@ -2446,6 +2456,7 @@ Gogo::set_unique_prefix(const std::string& arg)
 {
   gcc_assert(this->unique_prefix_.empty());
   this->unique_prefix_ = arg;
+  this->unique_prefix_specified_ = true;
 }
 
 // Work out the package priority.  It is one more than the maximum
@@ -2477,7 +2488,7 @@ Gogo::do_exports()
   exp.export_globals(this->package_name(),
 		     this->unique_prefix(),
 		     this->package_priority(),
-		     (this->need_init_fn_ && this->package_name() != "main"
+		     (this->need_init_fn_ && !this->is_main_package()
 		      ? this->get_init_fn_name()
 		      : ""),
 		     this->imported_init_fns_,

gcc/go/gofrontend/gogo.h

@@ -112,6 +112,10 @@ class Gogo
   void
   set_package_name(const std::string&, source_location);
 
+  // Return whether this is the "main" package.
+  bool
+  is_main_package() const;
+
   // If necessary, adjust the name to use for a hidden symbol.  We add
   // a prefix of the package name, so that hidden symbols in different
   // packages do not collide.
@@ -653,6 +657,8 @@ class Gogo
   std::set<Import_init> imported_init_fns_;
   // The unique prefix used for all global symbols.
   std::string unique_prefix_;
+  // Whether an explicit unique prefix was set by -fgo-prefix.
+  bool unique_prefix_specified_;
   // A list of interface types defined while parsing.
   std::vector<Interface_type*> interface_types_;
 };