Avoid a static member declared "weak after use"

Question

Avoid a static member declared "weak after use"

Using OpenCL C ++ Wrapper 1.2.7 in GCC 5.1.0 gives error

/usr/include/CL/cl.hpp:2442:29: error: cl::Context::default_initialized_ declared weak after being used
     static std::atomic<int> default_initialized_;

this is a list of relevant location codes:

class Context 
    : public detail::Wrapper<cl_context>
{
private:

#ifdef CL_HPP_CPP11_ATOMICS_SUPPORTED 
    static std::atomic<int> default_initialized_; // <- line 2442
#else // !CL_HPP_CPP11_ATOMICS_SUPPORTED
    static volatile int default_initialized_;
#endif // !CL_HPP_CPP11_ATOMICS_SUPPORTED

I was able to find this error message in some of the fixes for GCC and its source code and did not explain what it means and how to avoid it.

I think this refers to weak characters ~~, but the error seems to be for functions that don't make sense in this context~~ (based on the old error message declared inline after calling ").

For me it boils down to the following questions:

Who is the culprit? Me, OpenCL wrapper or GCC?

and

How can I avoid this error?

MWE

#include <CL/cl.hpp>    
int main() {}

While creating this example, I noticed that the error only occurs when using the undefined ( -fsanitize=undefined

) behavior sanitizer .

The problem occurs with another member when using pre C ++ 11, but the error message remains the same.

Additional context

I went through the code cl.hpp

and found the likely source of the error.

Both cl::Context

and cl::CommandQueue

start with

private:
#ifdef CL_HPP_CPP11_ATOMICS_SUPPORTED
    static std::atomic<int> default_initialized_;
#else // !CL_HPP_CPP11_ATOMICS_SUPPORTED
    static volatile int default_initialized_;
#endif // !CL_HPP_CPP11_ATOMICS_SUPPORTED
    static CommandQueue default_;
    static volatile cl_int default_error_;

and then have, for example,

#ifdef _WIN32
#ifdef CL_HPP_CPP11_ATOMICS_SUPPORTED
__declspec(selectany) std::atomic<int> Context::default_initialized_;
#else // !CL_HPP_CPP11_ATOMICS_SUPPORTED
__declspec(selectany) volatile int Context::default_initialized_ = __DEFAULT_NOT_INITIALIZED;
#endif // !CL_HPP_CPP11_ATOMICS_SUPPORTED
__declspec(selectany) Context Context::default_;
__declspec(selectany) volatile cl_int Context::default_error_ = CL_SUCCESS;
#else // !_WIN32
#ifdef CL_HPP_CPP11_ATOMICS_SUPPORTED
__attribute__((weak)) std::atomic<int> Context::default_initialized_;
#else // !CL_HPP_CPP11_ATOMICS_SUPPORTED
__attribute__((weak)) volatile int Context::default_initialized_ = __DEFAULT_NOT_INITIALIZED;
#endif // !CL_HPP_CPP11_ATOMICS_SUPPORTED
__attribute__((weak)) Context Context::default_;
__attribute__((weak)) volatile cl_int Context::default_error_ = CL_SUCCESS;
#endif // !_WIN32