I have a problem with multiple use constexpr C++17.

#include <iostream>

int main()
{
static constexpr bool condition_a = true;

    if constexpr (condition_a) 
    {
        // I create object A
        int A = 10;
    }


    if constexpr (condition_a) 
    {
        // I try to use object A
        std::cout << "out " << A << std::endl;
    }

}

Compiler return: “error: ‘A’ was not declared in this scope”
How can I create this object and use in next if statement?