Generate location.hh when api.location.type is provided

[egorpugin]

Hi, I'd like to extend default location class, but when %define api.location.type { MyLocation } is provided, location.hh is not generated.

Is it possible to add some option for such case?

#include <location.hh> 
struct MyLocation : yy_cl::location
{
    int argument;
};