linker fix for linux - __rust_probestack

[andrei-marinica]

Fixed the linker issue on Linux, related to probestack.

This issue appears for Rust compilers newer than 1.89, and was fixed in Wasmer 6.1.0.

[Copilot]

Pull request overview

This pull request addresses a linker issue on Linux related to __rust_probestack that affects Rust compilers newer than version 1.89. The fix was already implemented in Wasmer 6.1.0 and is being backported here.

Changes:

• Updates Rust toolchain from 1.56 to 1.90
• Adds rustversion build dependency for version-conditional compilation
• Implements custom __rust_probestack function when missing from newer Rust versions
• Updates all dependencies in Cargo.lock

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
rust-toolchain	Updates Rust version from 1.56 to 1.90
lib/vm/Cargo.toml	Adds rustversion 1.0 as build dependency
lib/vm/build.rs	Adds version-conditional cfg for missing_rust_probestack
lib/vm/src/probestack/mod.rs	Adds conditional compilation logic to use custom or built-in probestack
lib/vm/src/probestack/compiler_builtins.rs	New file containing probestack implementation from compiler-builtins crate
Cargo.lock	Updates all dependencies to newer versions

Comments suppressed due to low confidence (1)

lib/vm/src/probestack/mod.rs:73

• The nested cfg_if block has redundant conditions. Line 64 checks for not(missing_rust_probestack) and line 70 checks for missing_rust_probestack. Since these are mutually exclusive and exhaustive, the second condition on line 70 is redundant and can be replaced with just else without the else if #[cfg(missing_rust_probestack)] part.

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[Copilot]

The PR description states that this issue appears for Rust compilers newer than 1.89, but the conditional compilation in the build script sets missing_rust_probestack for versions since 1.89 (i.e., 1.89 and later). This means version 1.89 itself is treated as having the missing probestack issue. Please verify if the issue starts at 1.89 or after 1.89. If the issue only affects versions after 1.89, the attribute should be #[rustversion::after(1.89)] instead of #[rustversion::since(1.89)].

Suggested change

	#[rustversion::since(1.89)]
	#[rustversion::after(1.89)]

[andrei-marinica]

Yes, it is tested.

[Copilot]

The Rust version is being updated from 1.56 to 1.90, which is a significant jump. This is a major version upgrade that may introduce breaking changes or require other parts of the codebase to be updated. Please ensure that all code compiles and all tests pass with Rust 1.90, and consider documenting this version requirement change in the project's release notes or changelog.

Suggested change

	1.90
	[toolchain]
	channel = "1.90.0"

[andrei-marinica]

It was tested. We will be migrating to wasmer 6+, this repo is in maintenance mode, hence no major code update will be done.