[rust] bindgen path supports env!() macro#1569
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kvcache wants to merge 1 commit intobytecodealliance:mainfrom
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[rust] bindgen path supports env!() macro#1569kvcache wants to merge 1 commit intobytecodealliance:mainfrom
kvcache wants to merge 1 commit intobytecodealliance:mainfrom
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This makes it possible to refer to a wit path by a path that includes things like OUT_DIR or CARGO_MANIFEST_DIR. Relative paths that navigate up, like `../wit/`, don't work well with cargo publish, and symlinks have difficulties between git and cargo. Using [macro-string](https://github.com/dtolnay/macro-string), this replaces the `path` option's `syn::LitStr` with MacroString.
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For context, this is the expression I'm able to compile locally with this change: wit_bindgen::generate!({
world: "momento:bytes/imports",
path: [ concat!(env!("OUT_DIR"), "/wit/host") ],
}); |
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Mar 14, 2026
The workspace folders aren't accessible at publish or docs.rs time. Pulling the wits into OUT_DIR makes them accessible to bindgen during those build phases. Depends on: bytecodealliance/wit-bindgen#1569
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This makes it possible to refer to a wit path by a path that includes
things like OUT_DIR or CARGO_MANIFEST_DIR. Relative paths that navigate
up, like
../wit/, don't work well with cargo publish, and symlinkshave difficulties between git and cargo.
Using macro-string, this replaces the
pathoption'ssyn::LitStrwith MacroString.See the example
crates/guest-rust/src/examples/_5_import_directory.rsforhow this can be used. I need this capability so I can write separate crates for
a partially inter-related set of WIT's without having to copy/paste the whole
WIT tree for each package.
Before:
error: expected string literalAfter: Example 5 compiles.