What CMake options does pygit2 use to build libgit2?

[timxx]

Hi,

I tried building libgit2 from the latest tag v1.9.1 on Windows using the following CMake options:

-DCMAKE_BUILD_TYPE=Release -DBUILD_TESTS=OFF

The resulting git2.dll binary size is 1,672 KB.

However, the git2.dll packaged with pygit2 is 4,329 KB. While the size difference is not a major concern, I noticed a significant performance improvement when I replaced the pygit2-provided git2.dll with my own build:
The Repository.walk operation time dropped from about 9 seconds to ~4 seconds.

Questions:

1. What CMake options does pygit2 use to build its bundled libgit2?
2. Why might there be such a difference in binary size and performance between the two builds?

Thank you!

[timxx]

I wonder the official git2.dll is Debug build, as the size is much same as Debug build on my machine LoL