zig-repro/README.md

Building modern Zig from the original C++ implementation
--------------------------------------------------------

This repository explores building Zig from the C++ implementation without using
binary blobs. [Forum post goes with this][1].

Clone zig and prune binary files from history:

```
$ git clone https://github.com/ziglang/zig zig2
$ cd zig2
$ git filter-repo --prune-empty=never --prune-degenerate never --invert-paths --path-glob 'stage1/zig1.wasm*' --path stage1/zig1.c
```

Now build an isolated container with a bunch of zig historic dependencies:

```
$ docker build -t zig-repro .
$ docker run -ti --rm \
    -v ~/code:/x \
    -v /home/$USER/.cache/zig:/home/$USER/.cache/zig \
    -w /x/zig2 \
    zig-repro \
    sh -c "useradd -s /bin/bash -u $UID $USER && su $USER; bash"
```

And run the thing in the container:

```
$ ../zig-repro/run
```

[1]: https://ziggit.dev/t/building-self-hosted-from-the-original-c-implementation/6607/11