What is wrong with an object being assigned to itself?

Question

I want to use the init_priority(prio) attribute
(https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html#C_002b_002b-Attributes)

to initialize stuff in my library early so that users of the library can use the library during their own static objects construction. However, my library uses standard C++ library facilities like std::string,
std::vector, etc. The question is:

What is the lowest priority for init_priority attribute that I can use to still have libstdc++ initialize itself before my library is initialized?

Answer 1

A segfault occurs at runtime.