The wasmer_compiler_cranelift package doesn't work on M1

[Michael-F-Bryan]

Describe the bug

Trying to import the wasmer_compiler_cranelift library (or any of the compilers) on an M1 will unconditionally trigger an ImportError.

wasmer-python/packages/any-api/wasmer/__init__.py

Line 1 in 854ecac

raise ImportError("Wasmer is not available on this system")

CC: @ayys

[ayys]

possible duplicate of #539

[ayys]

I was able to get wasmer running from python on my M1.

uname -a
Darwin Micu.local 22.1.0 Darwin Kernel Version 22.1.0: Sun Oct  9 20:14:30 PDT 2022; root:xnu-8792.41.9~2/RELEASE_ARM64_T8103 arm64

Previously, I was getting this error

In [1]: import wasmer
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
Input In [1], in <cell line: 1>()
----> 1 import wasmer

File /opt/homebrew/lib/python3.10/site-packages/wasmer/__init__.py:1, in <module>
----> 1 raise ImportError("Wasmer is not available on this system")

ImportError: Wasmer is not available on this system

Using my locally compiled version of this repo, I can now import wasmer.

In [1]: import wasmer

In [2]: wasmer.Store
Out[2]: Store

To get this running, I went through the development setup guide in readme, except I made the following change

diff --git a/justfile b/justfile
index 22742a3..c2823d3 100644
--- a/justfile
+++ b/justfile
@@ -65,7 +65,7 @@ build package='api' rust_target=`rustc -vV | awk '/^host/ { print $2 }'`:

         cd packages/{{package}}/

-        maturin develop --binding-crate pyo3 --release --strip --cargo-extra-args="${build_args}"
+        maturin develop --binding-crate pyo3 --release --strip

 # Build all the wheels.
 build-all-wheels python_version rust_target:

If I keep the --cargo-extra-args flag, I get the following error when running just build api

just build api
Build arguments:  --target aarch64-apple-darwin
error: Found argument '--cargo-extra-args' which wasn't expected, or isn't valid in this context

	If you tried to supply `--cargo-extra-args` as a value rather than a flag, use `-- --cargo-extra-args`

USAGE:
    maturin develop --bindings <BINDINGS> --release --strip

For more information try --help
error: Recipe `build` failed with exit code 2

[Michael-F-Bryan]

Hmm... it's really strange that everything worked after you recompiled. We've committed Cargo.lock, so it's not like cargo is using a different version of wasmer.

I'm not too familiar with how the wasmer package figures out which compiler to use, but I'm guessing a good place to start would be finding that logic, and in particular what makes it fall back to importing any-api.

That --cargo-extra-args thing is probably a red herring. From their changelog, it seems like --cargo-extra-args was removed in Maturin 0.13.0.

[cch0]

I am seeing the same issue on M1.

• Saw the same error after doing import wasmer
• Followed the instruction to compile and then no error after doing import wasmer.

[cch0]

Actually, according to README, Darwin + arm64 is not yet supported which makes sense for error.

[qartik]

I just tried installing wasmer-python 1.2.0 directly from master. It seems to work fine on my M2 machine.

Can we expect a release soon? @ayys

[pachacamac]

seems to work with python version 3.9 on Apple M1