Initializer with address_space requires cv qualifier

as_cv.cpp

// No error
__attribute__((address_space(42)))
const float withc = 1.0f;

// No error
__attribute__((address_space(42)))
volatile float withv = 1.0f;

// Error
__attribute__((address_space(42)))
float nocv = 1.0f;

/*
as_initializer.cpp:12:7: error: cannot initialize a variable of type
      '__attribute__((address_space(42))) float' with an rvalue of type 'float'
float nocv = 1.0f;
      ^      ~~~~
1 error generated.
*/

This only happens in C++ mode. It compiles in C mode.