How to compile Foundation and use it in my Xcode project?

Hello to all,

my name is Macabeus and I'm studying Swift compiler and Swift's libraries.
Then, I made some changes in Foundation for study purposes. I can compile
Foundation in Xcode:
<img src='//' width='690' height='78'>

But, how to use my Foundation library in another Xcode project? I need test
my changes in another project.
I expected it was generated a package, but it not made new file.

Also, another questions: this is a good issue?
<; I want to resolve this issue, to

Thank you for your attention.