https://llvm.org/bugs/show_bug.cgi?id=28873
Bug ID: 28873
Summary: Cannot use the destructor of a templated class as a
friend
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++14
Assignee: unassignedclangb...@nondot.org
Reporter: ronan.kery...@xilinx.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16892
--> https://llvm.org/bugs/attachment.cgi?id=16892&action=edit
6 examples with Makefile
Clang from trunk (4.0.0 r277725) fails to compile the following code
whereas g++ 5.4 does:
template <typename T>
class b {
public:
~b() {
}
};
template <typename T>
class a {
friend b<T>::~b();
};
int main() {
a<int> v;
return 0;
}
clang++ -std=c++14 tfd1.cpp -o tfd1
tfd1.cpp:10:16: error: expected the class name after '~' to name the enclosing
class
friend b<T>::~b();
^
tfd1.cpp:16:10: note: in instantiation of template class 'a<int>' requested
here
a<int> v;
^
1 error generated.
So I tried different variation of this code that all compile with g++
but not all on Clang. Note that some of them may not be correct C++,
but I do not know.
The Makefile and the samples are attached to test.
make -k CXX=g++
rm -f tfd1 tfd1.1 tfd1.fun tfd2 tfd2.1 tfd2.fun
g++ -std=c++14 tfd1.cpp -o tfd1
g++ -std=c++14 tfd1.1.cpp -o tfd1.1
g++ -std=c++14 tfd1.fun.cpp -o tfd1.fun
g++ -std=c++14 tfd2.cpp -o tfd2
g++ -std=c++14 tfd2.1.cpp -o tfd2.1
g++ -std=c++14 tfd2.fun.cpp -o tfd2.fun
make -k CXX=g++ CXXFLAGS=-std=c++1z
rm -f tfd1 tfd1.1 tfd1.fun tfd2 tfd2.1 tfd2.fun
g++ -std=c++1z tfd1.cpp -o tfd1
g++ -std=c++1z tfd1.1.cpp -o tfd1.1
g++ -std=c++1z tfd1.fun.cpp -o tfd1.fun
g++ -std=c++1z tfd2.cpp -o tfd2
g++ -std=c++1z tfd2.1.cpp -o tfd2.1
g++ -std=c++1z tfd2.fun.cpp -o tfd2.fun
make -k CXX=clang++
clang++ -std=c++14 tfd1.cpp -o tfd1
tfd1.cpp:10:16: error: expected the class name after '~' to name the enclosing
class
friend b<T>::~b();
^
tfd1.cpp:16:10: note: in instantiation of template class 'a<int>' requested
here
a<int> v;
^
1 error generated.
<builtin>: recipe for target 'tfd1' failed
make: *** [tfd1] Error 1
clang++ -std=c++14 tfd1.1.cpp -o tfd1.1
tfd1.1.cpp:10:16: error: '~b' is missing exception specification 'noexcept'
friend b<T>::~b<T>();
^
noexcept
tfd1.1.cpp:16:10: note: in instantiation of template class 'a<int>' requested
here
a<int> v;
^
tfd1.1.cpp:4:3: note: previous declaration is here
~b() {
^
1 error generated.
<builtin>: recipe for target 'tfd1.1' failed
make: *** [tfd1.1] Error 1
clang++ -std=c++14 tfd1.fun.cpp -o tfd1.fun
clang++ -std=c++14 tfd2.cpp -o tfd2
tfd2.cpp:11:17: error: expected the class name after '~' to name a destructor
friend b<U>::~b();
^
1 error generated.
<builtin>: recipe for target 'tfd2' failed
make: *** [tfd2] Error 1
clang++ -std=c++14 tfd2.1.cpp -o tfd2.1
tfd2.1.cpp:11:17: error: destructor name 'b' does not refer to a template
friend b<U>::~b<U>();
~~~~~~ ^
1 error generated.
<builtin>: recipe for target 'tfd2.1' failed
make: *** [tfd2.1] Error 1
clang++ -std=c++14 tfd2.fun.cpp -o tfd2.fun
tfd2.fun.cpp:11:21: warning: dependent nested name specifier 'b<U>::' for
friend
class declaration is not supported; turning off access control for 'a'
[-Wunsupported-friend]
friend void b<U>::f();
~~~~~~^
1 warning generated.
make -k CXXFLAGS=-std=c++1z
provides an interesting variant for tfd1.1.cpp requesting the use of
noexcept, which does not solve the problem:
clang++ -std=c++1z tfd1.cpp -o tfd1
tfd1.cpp:10:16: error: expected the class name after '~' to name the enclosing
class
friend b<T>::~b();
^
tfd1.cpp:16:10: note: in instantiation of template class 'a<int>' requested
here
a<int> v;
^
1 error generated.
<builtin>: recipe for target 'tfd1' failed
make: *** [tfd1] Error 1
clang++ -std=c++1z tfd1.1.cpp -o tfd1.1
tfd1.1.cpp:10:16: error: '~b' is missing exception specification 'noexcept'
friend b<T>::~b<T>();
^
noexcept
tfd1.1.cpp:16:10: note: in instantiation of template class 'a<int>' requested
here
a<int> v;
^
tfd1.1.cpp:4:3: note: previous declaration is here
~b() {
^
1 error generated.
<builtin>: recipe for target 'tfd1.1' failed
make: *** [tfd1.1] Error 1
clang++ -std=c++1z tfd1.fun.cpp -o tfd1.fun
clang++ -std=c++1z tfd2.cpp -o tfd2
tfd2.cpp:11:17: error: expected the class name after '~' to name a destructor
friend b<U>::~b();
^
1 error generated.
<builtin>: recipe for target 'tfd2' failed
make: *** [tfd2] Error 1
clang++ -std=c++1z tfd2.1.cpp -o tfd2.1
tfd2.1.cpp:11:17: error: destructor name 'b' does not refer to a template
friend b<U>::~b<U>();
~~~~~~ ^
1 error generated.
<builtin>: recipe for target 'tfd2.1' failed
make: *** [tfd2.1] Error 1
clang++ -std=c++1z tfd2.fun.cpp -o tfd2.fun
tfd2.fun.cpp:11:21: warning: dependent nested name specifier 'b<U>::' for
friend
class declaration is not supported; turning off access control for 'a'
[-Wunsupported-friend]
friend void b<U>::f();
~~~~~~^
1 warning generated.
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