clang: no out-of-line virtual method definitions (pure abstract C++ class)

Question

I\'m trying to compile the following simple C++ code using Clang-3.5:

test.h:

class A
{
  public:
    A();
    virtual ~A() = 0;
};

Answer 1

This can be solved in three ways.

1. Use at least one virtual function which is not inline. Defining a virtual destructor is also alright as far as it is not an inline function.

2. Disable the warning as shown below.

   #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wweak-vtables" class ClassName : public Parent { ... }; #pragma clang diagnostic pop

3. Use only .h files for class declarations.