26 lines
1.5 KiB
Markdown
26 lines
1.5 KiB
Markdown
# The `run-make` test suite
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The `run-make` test suite contains tests which are the most flexible out of all the [rust-lang/rust](https://github.com/rust-lang/rust) test suites. `run-make` tests can basically contain arbitrary code, and are supported by the [`run_make_support`] library.
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## Infrastructure
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A `run-make` test is a test recipe source file `rmake.rs` accompanied by its parent directory (e.g. `tests/run-make/foo/rmake.rs` is the `foo` `run-make` test).
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The implementation for collecting and building the `rmake.rs` recipes are in [`src/tools/compiletest/src/runtest.rs`](../../src/tools/compiletest/src/runtest.rs), in `run_rmake_test`.
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The setup for the `rmake.rs` can be summarized as a 3-stage process:
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1. First, we build the [`run_make_support`] library in bootstrap as a tool lib.
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2. Then, we compile the `rmake.rs` "recipe" linking the support library and its dependencies in, and provide a bunch of env vars. We setup a directory structure within `build/<target>/test/run-make/`
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```
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<test-name>/
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rmake.exe # recipe binary
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rmake_out/ # sources from test sources copied over
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```
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and copy non-`rmake.rs` input support files over to `rmake_out/`. The support library is made available as an [*extern prelude*][extern_prelude].
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3. Finally, we run the recipe binary and set `rmake_out/` as the working directory.
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[`run_make_support`]: ../../src/tools/run-make-support
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[extern_prelude]: https://doc.rust-lang.org/reference/names/preludes.html#extern-prelude
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