[Bug c++/57775] New: default argument for template parameter error for friend definition in template

["cooloud at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57775

            Bug ID: 57775
           Summary: default argument for template parameter error for
                    friend definition in template
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cooloud at gmail dot com

MinGW4.7.2 cannot not parse a very simple code like following,

source code:
template <class T=void> struct X
{
    friend void f(){
        struct Y{}; // line 6
    }
};


command and result:
C:\Users\HJ>g++ -v -Wall -Wextra -c tmp.cpp
Using built-in specs.
COLLECT_GCC=g++
Target: mingw32
Configured with: ../gcc-4.7.2/configure
--enable-languages=c,c++,ada,fortran,obj
c,obj-c++ --disable-sjlj-exceptions --with-dwarf2 --enable-shared
--enable-libgo
mp --disable-win32-registry --enable-libstdcxx-debug
--disable-build-poststage1-
with-cxx --enable-version-specific-runtime-libs --build=mingw32 --prefix=/mingw
Thread model: win32
gcc version 4.7.2 (GCC)
COLLECT_GCC_OPTIONS='-v' '-Wall' '-Wextra' '-c' '-shared-libgcc' '-mtune=i386'
'
-march=i386'
 c:/mingw/bin/../libexec/gcc/mingw32/4.7.2/cc1plus.exe -quiet -v -iprefix
c:\min
gw\bin\../lib/gcc/mingw32/4.7.2/ tmp.cpp -quiet -dumpbase tmp.cpp -mtune=i386
-m
arch=i386 -auxbase tmp -Wall -Wextra -version -o
C:\Users\HJ\AppData\Local\Temp\
cc3msAXa.s
GNU C++ (GCC) version 4.7.2 (mingw32)
        compiled by GNU C version 4.7.2, GMP version 5.0.1, MPFR version 2.4.1,
MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"c:\mingw\bin\../lib/gcc/mingw32/4.7.2/../../../.
./mingw32/include"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.7.2/inclu
de/c++"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.7.2/inclu
de/c++/mingw32"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.7.2/inclu
de/c++/backward"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.7.2/inclu
de"
ignoring duplicate directory "/mingw/lib/gcc/mingw32/4.7.2/../../../../include"
ignoring duplicate directory "c:/mingw/lib/gcc/../../include"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.7.2/inclu
de-fixed"
ignoring nonexistent directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.7.2/../
../../../mingw32/include"
ignoring duplicate directory "/mingw/include"
#include "..." search starts here:
#include <...> search starts here:
 c:\mingw\bin\../lib/gcc/mingw32/4.7.2/include/c++
 c:\mingw\bin\../lib/gcc/mingw32/4.7.2/include/c++/mingw32
 c:\mingw\bin\../lib/gcc/mingw32/4.7.2/include/c++/backward
 c:\mingw\bin\../lib/gcc/mingw32/4.7.2/include
 c:\mingw\bin\../lib/gcc/mingw32/4.7.2/../../../../include
 c:\mingw\bin\../lib/gcc/mingw32/4.7.2/include-fixed
End of search list.
GNU C++ (GCC) version 4.7.2 (mingw32)
        compiled by GNU C version 4.7.2, GMP version 5.0.1, MPFR version 2.4.1,
MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: fdc0bc7c97f61ac24bf8edb5646b3bc3
tmp.cpp: In function 'void f()':
tmp.cpp:6:11: error: default argument for template parameter for class
enclosing
 'f()::Y::Y'