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This will let us add big endian testing to CI for our C code. (We were
already doing it for our Rust code.)
This is adapted from test_vectors/cross_test.sh. It works around the
limitation that the `cross` tool can't reach parent directories. It's an
unfortunate hack, but at least it's only for testing. It might've been
less hacky to use symlinks for this somehow, but I worry that would
break things on Windows, and I don't want to have to add workarounds for
my workarounds.
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Samuel noticed that rustc seems to assume (incorrectly?) that all i686
targets support SSE2, but it doesn't make that assumption for i586.
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This is quite hard to trigger, because SSE2 has been guaranteed for a
long time. But you could trigger it this way:
rustup target add i686-unknown-linux-musl
RUSTFLAGS="-C target-cpu=i386" cargo build --target i686-unknown-linux-musl
Note a relevant gotcha though: The `cross` tool will not forward
environment variables like RUSTFLAGS to the container by default, so if
you're testing with `cross` you'll need to use the `rustc` command to
explicitly pass the flag, as I've done here in ci.yml. (Or you could
create a `Cross.toml` file, but I don't want to commit one of those if I
can avoid it.)
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As proposed in
https://github.com/BLAKE3-team/BLAKE3/issues/33#issuecomment-623153164
This brings b3sum behavior close to md5sum. All occurrences of backslash
are replaced with "\\", and all occurrences of (Unix) newline are
replaced with "\n". In addition, any line containing these escapes has a
single "\" prepended to the front.
Filepaths were already being converted to UTF-8 with to_string_lossy(),
but this commit adds an extra warning when that conversion is in fact
lossy (because the path is not valid Unicode). This new warning is
printed to stdout, with the goal of deliberately breaking --check (which
is not yet implemented) in this case.
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These configs and code are adapted from the CI workflow in
https://github.com/oconnor663/blake3-py, especially the
upload_github_release_asset.py script, which is copied verbatim.
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There are two scenarios where compiling AVX-512 C or assembly code might
not work:
1. There might not be a C compiler installed at all. Most commonly this
is either in cross-compiling situations, or with the Windows GNU
target.
2. The installed C compiler might not support e.g. -mavx512f, because
it's too old.
In both of these cases, print a relevant warning, and then automatically
fall back to using the pure Rust intrinsics build.
Note that this only affects x86 targets. Other targets always use pure
Rust, unless the "neon" feature is enabled.
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This lets CI test a wider range of possible SIMD support settings.
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The biggest change here is that assembly implementations are enabled by
default.
Added features:
- "pure" (Pure Rust, with no C or assembly implementations.)
Removed features:
- "c" (Now basically the default.)
Renamed features;
- "c_prefer_intrinsics" -> "prefer_intrinsics"
- "c_neon" -> "neon"
Unchanged:
- "rayon"
- "std" (Still the only feature on by default.)
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This gives the assembly files the same prefix as the intrinsics files which
simplifies building when the build system should pick between the assembly and
the intrinsics files.
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As per instructions at:
https://help.github.com/en/actions/automating-your-workflow-with-github-actions/events-that-trigger-workflows
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CI is not currently working due to quota issues, so I'll need to check
that this is actually working later.
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As part of this, get rid of the BLAKE3_FUZZ_ITERATIONS variable. I
wasn't using it anywhere, and it was leading to some compiler warnings
in --no-default-features mode.
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This lets us enable it by default in b3sum.
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