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Don't emit an error about failing to produce a file with a specific name if user never gave an explicit name Fixes #122509 You can ask `rustc` to produce some intermediate results with `--emit foo`, this operation comes in two flavors: `--emit asm` and `--emit asm=foo.s`. First one produces one or more `.s` files without any name guarantees, second one renames it into `foo.s`. Second version only works when compiler produces a single file - for asm files this means using a single compilation unit for example. In case compilation produced more than a single file `rustc` runs following check to emit some warnings: ```rust if crate_output.outputs.contains_key(&output_type) { // 2) Multiple codegen units, with `--emit foo=some_name`. We have // no good solution for this case, so warn the user. sess.dcx().emit_warn(errors::IgnoringEmitPath { extension }); } else if crate_output.single_output_file.is_some() { // 3) Multiple codegen units, with `-o some_name`. We have // no good solution for this case, so warn the user. sess.dcx().emit_warn(errors::IgnoringOutput { extension }); } else { // 4) Multiple codegen units, but no explicit name. We // just leave the `foo.0.x` files in place. // (We don't have to do any work in this case.) } ``` Comment in the final `else` branch implies that if user didn't ask for a specific name - there's no need to emit warnings. However because of the internal representation of `crate_output.outputs` - this doesn't work as expected: if user asked to produce an asm file without giving it an implicit name it will contain `Some(None)`. To fix the problem new code actually checks if user gave an explicit name. I think this was an original intentional behavior, at least comments imply that. |
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| Cargo.toml | ||
| messages.ftl | ||
| README.md | ||
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.