Dear node-source-map maintainers, I have attached the patch that will fix the future build failure with Rust 1.96+. I have ensured it builds against both Rust 1.95 in Debian unstable and Rust 1.97 in a test Ubuntu 26.10 PPA.
Please let me know if you need any more info. Best wishes, Max
Description: Fix mapping_callback import on Rust 1.96+ Rust 1.96 stopped passing --allow-undefined to wasm-ld (https://github.com/rust-lang/rust/pull/149868). Previously, a bare extern "C" block on wasm32-unknown-unknown implicitly imported symbols from the "env" module. Now, as stated upstream (https://github.com/rust-lang/rust/pull/149868#issuecomment-3730522786), the link to env must be manually added. Author: Max Gilmour <[email protected]> Bug: https://github.com/mozilla/source-map/issues/530 Bug-Debian: https://bugs.debian.org/1142614 Forwarded: https://github.com/mozilla/source-map/pull/531 Last-Update: 2026-07-22 --- --- a/wasm-mappings/source-map-mappings-wasm-api/src/lib.rs +++ b/wasm-mappings/source-map-mappings-wasm-api/src/lib.rs @@ -251,6 +251,10 @@ mappings.as_mut().unwrap() } +// Since Rust 1.96 (rust-lang/rust#149868), wasm-ld is no longer invoked with +// `--allow-undefined`. As the PR states, importing from `env` must now be +// declared with the following line. +#[link(wasm_import_module = "env")] extern "C" { fn mapping_callback( // These two parameters are always valid.
