Close https://github.com/WebAssembly/wasi-libc/issues/520
Add FTS implementation derived from musl-fts with a few modifications.
The compiled fts.o is included in the libc.a archive, and the fts.h
header is installed in the sysroot (`include/fts.h`).
* fts/musl-fts: Add a copy of the musl-fts sources with modifications.
* fts/patches: A set of patches to apply to the musl-fts sources.
* Upstream pull request: https://github.com/void-linux/musl-fts/pull/14
* fts/update-musl-fts.sh: A script to update the musl-fts sources with
the patches applied.
* fts/config.h: A configuration header included by the musl-fts sources.
* test/smoke: Add a test suite for wasi-libc specific features that
libc-test does not cover.
* Start renaming preview1 to p1 and preview2 to p2
This is an initial start at renaming the "preview" terminology in WASI
targets to "pX". For example the `wasm32-wasi` target should transition
to `wasm32-wasip1`, `wasm32-wasi-preview2` should transition to
`wasm32-wasip2`, and `wasm32-wasi-threads` should transition to
`wasm32-wasip1-threads`. This commit applies a few renames in the
`Makefile` such as:
* `WASI_SNAPSHOT` is now either "p1" or "p2"
* The default p2 target triple is now `wasm32-wasip2` instead of
`wasm32-wasi-preview2` (in the hopes that it's early enough to change
the default).
* Bindings for WASIp2 were renamed from "preview2" terminology to "wasip2".
* The expected-defines files are renamed and the logic of which
expectation was used has been updated slightly.
With this commit the intention is that non-preview2 defaults do not
change. For example the default build still produces a `wasm32-wasi`
sysroot. If `TARGET_TRIPLE=wasm32-wasip1` is passed, however, then that
sysroot is produced instead. Similarly a `THREAD_MODEL=posix` build
produces a `wasm32-wasi-threads` sysroot target but you can now also
pass `TARGET_TRIPLE=wasm32-wasip1-threads` to rename the sysroot.
My hope is to integrate this into the wasi-sdk repository and build a
dual sysroot for these new targets for a release or two so both are
supported and then in the future the defaults can be switched away from
`wasm32-wasi` to `wasm32-wasip1` as built-by-default.
* Update builds in CI
* Update test workflow
* Fix test for wasm32-wasip1-threads
* Make github actions rules a bit more readable
