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Add basic docs for the new aux-bin header #1942

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Apr 6, 2024
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Add basic docs for the new aux-bin header #1942

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7 changes: 6 additions & 1 deletion src/tests/compiletest.md
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Expand Up @@ -501,10 +501,11 @@ only running the main `coverage` suite.
## Building auxiliary crates

It is common that some tests require additional auxiliary crates to be compiled.
There are two [headers](headers.md) to assist with that:
There are three [headers](headers.md) to assist with that:

* `aux-build`
* `aux-crate`
* `aux-bin`

`aux-build` will build a separate crate from the named source file.
The source file should be in a directory called `auxiliary` beside the test file.
Expand All @@ -529,6 +530,10 @@ For example, `// aux-crate:foo=bar.rs` will compile `auxiliary/bar.rs` and
make it available under then name `foo` within the test.
This is similar to how Cargo does dependency renaming.

`aux-bin` is similar to `aux-build` but will build a binary instead of a
library. The binary will be available in `auxiliary/bin` relative to the working
directory of the test.

### Auxiliary proc-macro

If you want a proc-macro dependency, then there currently is some ceremony
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