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README.md: document rust requirement #452

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README.md: document rust requirement #452

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README.md: document rust requirement
yamt Jul 18, 2024
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README.md: drop "latest" from rust requirement
yamt Aug 29, 2024
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Expand Up @@ -44,6 +44,7 @@ The Wasm-sdk's build process needs some packages :
* `clang`
* `ninja`
* `python3`
* The latest rust toolchain
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Looks like this would indicate that 1.76.0 should work? But you mention that 1.77.0 did not work for you... what did you see?

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see #450

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@abrown do you have any more concerns?

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@abrown abrown Aug 28, 2024 •
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Well, I kind of was thinking we could be more precise here and since wasm-component-ld is being successfully built with Rust 1.76.0 in CI we should probably document that. But then I'm confused why 1.77.0 didn't work for you? Or was something else the problem?

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i dunno. i merely blindly followed alex's advice to update the toolchain.

but is it worth to block this PR for a month while we don't document such precise verisions for other requirements either? (cmake python etc)

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since it isn't clear to you which version you used

It's clear it was 1.77.0.

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Ok, I guess I was the one who misunderstood, sorry! But something still doesn't seem quite right with what you reported. I tried to replicate what you found and I'm seeing that wasm-component-ld builds just fine with version v1.76.0:

$ cargo install 1.76.0
$ cargo default 1.76.0
$ cargo version
cargo 1.76.0 (c84b36747 2024-01-18)
$ cmake -G Ninja -B build/toolchain -S . -DWASI_SDK_BUILD_TOOLCHAIN=ON -DCMAKE_INSTALL_PREFIX=build/install
...
$ cmake --build build/toolchain --target wasm-component-ld
...
   Compiling wasm-component-ld v0.5.6
    Finished release [optimized] target(s) in 18.50s
  Installing /.../wasi-sdk/build/toolchain/wasm-component-ld/bin/wasm-component-ld
   Installed package `wasm-component-ld v0.5.6` (executable `wasm-component-ld`)

If I run the same with v1.75.0, I see the following failure:

error: cannot install package `wasm-component-ld 0.5.6`, it requires rustc 1.76.0 or newer, while the currently active rustc version is 1.75.0

Is there any chance something else was wrong with the environment you ran v1.77.0 in?

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Sorry, which part of the claim was incorrect? "Latest"?

Yes, this is incorrect. For example when you created this PR Rust 1.79 was the latest Rust release. I believe what you were trying to document originally was that Rust 1.79 was required. As of today, however, Rust 1.80 is the latest Rust release. That means that the claim that the "latest" Rust release is needed is not correct.

Additionally wasm-component-ld as-used by wasi-sdk requires 1.76.0, and as Andrew pointed out this is tested in CI. This additionally means that the claim that the latest compiler is required is incorrect.

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Ok, I guess I was the one who misunderstood, sorry! But something still doesn't seem quite right with what you reported. I tried to replicate what you found and I'm seeing that wasm-component-ld builds just fine with version v1.76.0:

$ cargo install 1.76.0
$ cargo default 1.76.0
$ cargo version
cargo 1.76.0 (c84b36747 2024-01-18)
$ cmake -G Ninja -B build/toolchain -S . -DWASI_SDK_BUILD_TOOLCHAIN=ON -DCMAKE_INSTALL_PREFIX=build/install
...
$ cmake --build build/toolchain --target wasm-component-ld
...
   Compiling wasm-component-ld v0.5.6
    Finished release [optimized] target(s) in 18.50s
  Installing /.../wasi-sdk/build/toolchain/wasm-component-ld/bin/wasm-component-ld
   Installed package `wasm-component-ld v0.5.6` (executable `wasm-component-ld`)

If I run the same with v1.75.0, I see the following failure:

error: cannot install package `wasm-component-ld 0.5.6`, it requires rustc 1.76.0 or newer, while the currently active rustc version is 1.75.0

Is there any chance something else was wrong with the environment you ran v1.77.0 in?

i can still reproduce #450 with rustc 1.77.0 + wasm-component-ld 0.5.5.
(we bumped wasm-component-ld version to 0.5.6, which doesn't seem to have the problem, after this PR.)

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Yes, this is incorrect. For example when you created this PR Rust 1.79 was the latest Rust release. I believe what you were trying to document originally was that Rust 1.79 was required. As of today, however, Rust 1.80 is the latest Rust release. That means that the claim that the "latest" Rust release is needed is not correct.

ok. i dropped the "latest" claim. the main claim of this PR was "we require rust".

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Suggested change
* The latest rust toolchain
* [Rust](https://rustup.rs) v1.76.0 or later

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@abrown abrown Aug 28, 2024 •
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Maybe this should read "cargo and rustc v1.76.0 or later" for consistency.


Please refer to your OS documentation to install those packages.

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