https://bugs.llvm.org/show_bug.cgi?id=42339
Bug ID: 42339
Summary: Redefined classes are allowed
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: zhong...@pku.org.cn
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
My clang is 9.0.0, and the code is:
template < class TP1 >
class MainClass {
public:
class A;
friend class B;
A a;
template < class TP2 > class B {};
class A {
template < class TP2 > friend class B;
};
};
int main(int argc, char *argv[]) {
MainClass<int> var;
}
clang accepts the code, but other compilers reject it, since B is redefined.
gcc:
<source>: In instantiation of 'class MainClass<int>::A':
<source>:9:5: required from 'class MainClass<int>'
<source>:22:18: required from here
<source>:13:11: error: 'template<class TP2> class MainClass<int>::B' redeclared
as different kind of entity
13 | class A {
| ^
<source>:7:16: note: previous declaration 'class B'
7 | friend class B;
| ^
Compiler returned: 1
icc:
<source>(15): error: "B" has already been declared in the current scope
template < class TP2 > friend class B;
^
detected during:
instantiation of class "MainClass<TP1>::A [with TP1=int]" at line 9
instantiation of class "MainClass<TP1> [with TP1=int]" at line 22
compilation aborted for <source> (code 2)
Compiler returned: 2
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