39ee1b68   
   From: daniel.kruegler@googlemail.com   
      
   Am 18.03.2012 13:07, schrieb VladislavKurmaz:   
   > Here is minimal example, that tries to declare base class as friend   
   > for derived.   
   >   
   > template   
   > class base   
   > {   
   > };   
   >   
   > class derived : public base<  derived>   
   > {   
   > 	template<  class U>  friend class base;   
   > };   
   >   
   > msvc11/msvc10/msvc9/Comeau-online process this code withou any errors   
   > or warnings, but gcc-4.5.3(cygwin) : generate next message "error:   
   > specialization of 'base' after instantiation"   
   >   
   > Is it correct code from C++ standard perspective?   
      
   I'm pretty sure that this must be a compiler defect and opened an issue   
   for it (The error still exists in gcc 4.8):   
      
   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52625   
      
   HTH & Greetings from Bremen,   
      
   Daniel Krügler   
      
      
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