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922d8378e7
This change adds support for locating the Zig executable and the library and global cache directories, based on looking in the fixed "/zig" and "/cache" directories. Since our argv[0] on WASI is just the basename (any absolute/relative path information is deleted by the runtime), there's very limited introspection we can do on WASI, so we rely on these fixed directories. These can be provided on the command-line using `--mapdir`, as follows: ``` wasmtime --mapdir=/cwd::. --mapdir=/cache::"$HOME/.cache/zig" --mapdir=/zig::./zig-out/ ./zig-out/bin/zig.wasm ```