http://llvm.org/bugs/show_bug.cgi?id=21334
Bug ID: 21334
Summary: Incorrect warning generation "function definition with
pure-specifier is a Microsoft extension" with
templated types
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
When compiling C++ code using Clang in Visual Studio, when a templated class
provides an implementation for a pure virtual function, clang generates the
following warning:
"function definition with pure-specifier is a Microsoft extension
[-Wmicrosoft]"
This warning is always generated, even when the function definition is provided
separately from the function declaration. Consider the following code:
template<class T>
class ISomeType
{
public:
virtual ~ISomeType() = 0;
};
template<class T>
ISomeType<T>::~ISomeType() { }
template<class T>
class SomeType :public ISomeType<T>
{ };
int main()
{
SomeType<int> someObject;
return 0;
}
This is perfectly valid and standard C++ code. Despite this, Clang will
generate the following output from the compiler:
1>main.cpp(5,10): warning : function definition with pure-specifier is a
Microsoft extension [-Wmicrosoft]
1> virtual ~ISomeType() = 0;
1> ^
1> main.cpp(11,7) : note: in instantiation of member function
'ISomeType<int>::~ISomeType' requested here
1> class SomeType :public ISomeType<T>
1> ^
1> 1 warning generated.
Making ISomeType a non-template type will make the warning disappear.
The development environment used is Windows 8.1 with Visual Studio 2013 Update
3, using the following distribution of Clang for Windows:
http://llvm.org/builds/downloads/LLVM-3.6.0-r219740-win32.exe
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