[gtkmm/use-dllexport-3-24: 11/15] tools/m4/class_gtkobject.m4: Allow applying decorations

[Chun-wei Fan <fanchunwei src gnome org>]

commit d0a9ad2c5f1bef3ff8b6acd880c9931826d9ecce
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Sat Apr 11 23:18:43 2020 +0800

    tools/m4/class_gtkobject.m4: Allow applying decorations
    
    This updates the _CLASS_GTKOBJECT m4 macro so that we can decorate the
    declarations of classes and wrap functions with decorations so that we
    can use them to export symbols via defining those decorations with
    compiler directives.

 tools/m4/class_gtkobject.m4 | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/tools/m4/class_gtkobject.m4 b/tools/m4/class_gtkobject.m4
index acb09faa..f2e5900c 100644
--- a/tools/m4/class_gtkobject.m4
+++ b/tools/m4/class_gtkobject.m4
@@ -19,6 +19,7 @@ dnl rather than the real instance type.  That is really ugly, yes.  We get aroun
 dnl the problem by supporting optional __REAL_* arguments to this macro.
 define(`__REAL_CNAME__',ifelse(`$6',,__CNAME__,`$6'))
 define(`__REAL_CPARENT__',ifelse(`$7',,__CPARENT__,`$7'))
+define(`__FUNC_DECORATION__',`$8')
 
 
 dnl
@@ -104,7 +105,7 @@ dnl _STRUCT_PROTOTYPE() can be disabled with _STRUCT_NOT_HIDDEN.
 _STRUCT_PROTOTYPE()
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
-__NAMESPACE_BEGIN__ class __CPPNAME__`'_Class; __NAMESPACE_END__
+__NAMESPACE_BEGIN__ class __FUNC_DECORATION__ __CPPNAME__`'_Class; __NAMESPACE_END__
 #endif //DOXYGEN_SHOULD_SKIP_THIS
 
 _SECTION(SECTION_HEADER3)
@@ -121,6 +122,7 @@ namespace Glib
    *
    * @relates __NAMESPACE__::__CPPNAME__
    */
+  __FUNC_DECORATION__
   __NAMESPACE__::__CPPNAME__`'* wrap(__CNAME__`'* object, bool take_copy = false);
 } //namespace Glib
 ')dnl endif __BOOL_NO_WRAP_FUNCTION__
@@ -249,7 +251,7 @@ m4_ifdef(`__BOOL_PROTECTED_GCLASS__',
 `protected:',`dnl else
 private:')dnl endif
 
-  friend class __CPPNAME__`'_Class;
+  friend class __FUNC_DECORATION__ __CPPNAME__`'_Class;
   static CppClassType `'__BASE__`'_class_;
 
 protected: