This directory is for real-world outputs from tools that generate Ninja files.
Because these outputs are large, they aren‘t checked in to the Ninja tree. Instead for now it’s a random zip file on Google drive at
https://drive.google.com/file/d/1dlNAaf0XRXjV6UPkNV88JFuOBGJLdyGB/view?usp=sharing
It expects to be unzipped directly into this directory:
$ unzip snapshot.zip
llvm-cmake/ contains LLVM build files generated by CMake.
https://llvm.org/docs/GettingStarted.html (note they have a CMake-specific page that has instructions that don't work(?!))
$ cmake -G Ninja -B build -S llvm -DCMAKE_BUILD_TYPE=Release
llvm-gn/ contains LLVM build files generated by the GN build system.
Read llvm/utils/gn/README.rst in LLVM checkout for more, but in brief.
$ llvm/utils/gn/get.py $ llvm/utils/gn/gn.py gen out/gn
$ zip -r snapshot.zip .gitignore llvm-*