[Bug c++/11876] New: Cannot access protected member from templated copy constructor

[Bug c++/11876] New: Cannot access protected member from templated copy constructor

[ktulu at free dot fr]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11876

           Summary: Cannot access protected member from templated copy
                    constructor
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ktulu at free dot fr
                CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: ppc-darwin

Results from the command line:

bash-2.05a$ gcc -v -save-temps Test-2.cpp
Reading specs from /usr/libexec/gcc/darwin/ppc/3.3/specs
Thread model: posix
gcc version 3.3 20030304 (Apple Computer, Inc. build 1435)
 /usr/libexec/gcc/darwin/ppc/3.3/cc1plus -E -D__GNUG__=3 -quiet -v -D__GNUC__=3 -
D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=0 -D__APPLE_CC__=1435 -D__DYNAMIC__ 
Test-2.cpp -fPIC -D__private_extern__=extern Test-2.ii
ignoring nonexistent directory "/usr/ppc-darwin/include"
ignoring nonexistent directory "/Local/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/gcc/darwin/3.3/c++
 /usr/include/gcc/darwin/3.3/c++/ppc-darwin
 /usr/include/gcc/darwin/3.3/c++/backward
 /usr/local/include
 /usr/include/gcc/darwin/3.3
 /usr/include
End of search list.
Framework search starts here:
 /System/Library/Frameworks
 /Library/Frameworks
End of framework search list.
 /usr/libexec/gcc/darwin/ppc/3.3/cc1plus -fpreprocessed Test-2.ii -fPIC -quiet -dumpbase 
Test-2.cpp -auxbase Test-2 -version -D__private_extern__=extern -o Test-2.s
GNU C++ version 3.3 20030304 (Apple Computer, Inc. build 1435) (ppc-darwin)
        compiled by GNU C version 3.3 20030304 (Apple Computer, Inc. build 1435).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=131072
Test-2.cpp: In constructor `A<T>::A(const A<U>&) [with U = int, T = float]':
Test-2.cpp:26:   instantiated from here
Test-2.cpp:7: error: `int A<int>::_data' is protected
Test-2.cpp:10: error: within this context

The intermediate file:

# 1 "Test-2.cpp"
#pragma GCC set_debug_pwd "/Users/ktulu/Projects/Ktk/MacOs 10/Pb/Test"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "Test-2.cpp"
template <typename T>
class A
{
        friend class A<int>;
        friend class A<float>;
protected:
        T _data;
        inline A() : _data(0) {}
        template <typename U>
        inline A(const A<U>& r) : _data(r._data) {}


};

class B : public A<int>
{
public:
        inline B() {}
        inline B(const B& r) : A<int>(r) {}
};

class C : public A<float>
{
public:
        inline C() {}
        inline C(const B& r) : A<float>(r) {}
};


int main(int, char*[])
{
        B b1, b2(b1);
        C c(b1);
        return 0;
}

The original code snippet:

template <typename T>
class A
{
	friend class A<int>;
	friend class A<float>;
protected:
	T _data;
	inline A() : _data(0) {}
	template <typename U>
	inline A(const A<U>& r) : _data(r._data) {}
};

class B : public A<int>
{
public:
	inline B() {}
	inline B(const B& r) : A<int>(r) {}
};

class C : public A<float>
{
public:
	inline C() {}
	inline C(const B& r) : A<float>(r) {}
};

int main(int, char*[])
{
	B b1, b2(b1);
	C c(b1);
	return 0;
}

[Bug c++/11876] Cannot access protected member from templated copy constructor

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11876



------- Additional Comments From pinskia at gcc dot gnu dot org  2003-08-10 16:13 -------
I get the same error on 3.3.1 (20030707), 3.2.3, 3.0.4, and 2.95.3.  Both with the mainline, 
I get:
pr11876.cc: In instantiation of `A<int>':
pr11876.cc:17:   instantiated from here
pr11876.cc:4: error: class `A<int>' is implicitly friends with itself
pr11876.cc: In instantiation of `A<float>':
pr11876.cc:24:   instantiated from here
pr11876.cc:4: error: class `A<float>' is implicitly friends with itself
And with 2.91.66 I get the same as the mainline expect they are warnings instead of 
errors,  I do not know what is the right thing though.

[Bug c++/11876] Cannot access protected member from templated copy constructor

[lerdsuwa at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11876


lerdsuwa at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2003-08-11 12:47:24
               date|                            |


------- Additional Comments From lerdsuwa at gcc dot gnu dot org  2003-08-11 12:47 -------
Confirmed as a bug.  The problem is similar to PR641.

[Bug c++/11876] Cannot access protected member from templated copy constructor

[lerdsuwa at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11876


lerdsuwa at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |lerdsuwa at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED

[Bug c++/11876] Cannot access protected member from templated copy constructor

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11876


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
           Keywords|                            |rejects-valid
   Last reconfirmed|2003-08-11 12:47:24         |2003-08-22 02:11:51
               date|                            |

[Bug c++/11876] Cannot access protected member from templated copy constructor

[lerdsuwa at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11876



------- Additional Comments From lerdsuwa at gcc dot gnu dot org  2003-08-22 13:49 -------
Patch submitted:
  http://gcc.gnu.org/ml/gcc-patches/2003-08/msg01344.html

[Bug c++/11876] Cannot access protected member from templated copy constructor

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11876


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-08-23 14:17 -------
Fixed by:

	* friend.c (add_friend): Add complain parameter.
	(make_friend_class): Likewise.
	(do_friend): Adjust add_friend call.
	* decl.c (grokdeclarator): Adjust make_friend_class call.
	* parser.c (cp_parser_member_declaration): Likewise.
	(cp_parser_template_declaration_after_exp): Likewise.
	* pt.c (instantiate_class_template): Adjust make_friend_class
	and add_friend call.
	* cp-tree.h (make_friend_class): Adjust declaration.
	(add_friend): Likewise.
	
	* g++.dg/template/friend22.C: New test.
	* g++.dg/template/friend23.C: Likewise.