When I was trying to use libgit2 as a submodule building static library for another project under Xcode 16.1, I got linker errors and realized that the static library was not being created. In the process I found that - as far as I can tell - Xcode needs a workaround (a dummy C file) in order to actually create a static library file.

Libgit used to have this workaround built-in, but it was removed in d7b49ed (#6133).

As far as I can tell, this workaround is still needed when one wants to create a static library under Xcode.

For reference, this is what I used to build a static library:

mkdir build && cd build
cmake -G Xcode -D BUILD_SHARED_LIBS=OFF -D BUILD_CLI=OFF -D BUILD_EXAMPLES=OFF ..
cmake --build . --config RelWithDebInfo