Add run-make test port project summary

Author: Kobzol

posts/2024-11-01-gsoc-2024-results.md

@@ -86,7 +86,25 @@ You can also check out the following issues to find out what is left before this
 - Mentor: [Jieyou Xu](https://github.com/jieyouxu)
 - [Final report](https://oneirical.github.io/gsocfinal/)
 
-TODO
+The Rust compiler has several test suites that make sure that it is working correctly under various conditions. One of these suites is the [`run-make` test suite][run-make], whose tests were previously written using `Makefile`s. However, this setup [posed several problems][initial-run-make-issue]. It was not possible to run the suite on the Tier 1 Windows MSVC target (`x86_64-pc-windows-msvc`) and getting it running on Windows at all was quite challenging. Furthermore, the syntax of `Makefile`s is quite esoteric, which frequently caused mistakes to go unnoticed even when reviewed by multiple people.
+
+[Julien](https://github.com/Oneirical) helped to convert the `Makefile`-based `run-make` tests into plain Rust-based tests, supported by a test support library called [`run_make_support`][run-make-support]. However, it was not a trivial "rewrite this in Rust" kind of deal. In this project, Julien:
+
+- Significantly improved the test documentation;
+- Fixed multiple bugs that were present in the `Makefile` versions that had gone unnoticed for *years* -- some tests were never testing anything or silently ignored failures, so even if the subject being tested regressed, these tests would not have caught that.
+- Added to and improved the test support library API and implementation; and
+- Improved code organization within the tests to make them easier to understand and maintain.
+
+Just to give you an idea of the scope of his work, he has ported more than [300](https://github.com/rust-lang/rust/pulls?q=is%3Apr+author%3Aoneirical+is%3Amerged) Makefile tests over the span of his GSoC project! If you like puns, check out some of the branch names of Julien's PRs, they are a work of art.
+
+As a result, Julien has significantly improved the robustness of the `run-make` test suite, and improved the ergonomics of modifying existing `run-make` tests and authoring new `run-make` tests. Multiple contributors have expressed that they were more willing to work with the Rust-based `run-make` tests over the previous `Makefile` versions.
+
+The vast majority of `run-make` tests [now use the Rust-based test infrastructure][run-make-tracking-issue], with a few holdouts remaining due to various quirks. After these are resolved, we can finally rip out the legacy `Makefile` test infrastructure.
+
+[run-make]: https://github.com/rust-lang/rust/tree/master/tests/run-make
+[run-make-support]: https://github.com/rust-lang/rust/tree/master/src/tools/run-make-support
+[initial-run-make-issue]: https://github.com/rust-lang/rust/issues/40713
+[run-make-tracking-issue]: https://github.com/rust-lang/rust/issues/121876
 
 ### Rewriting the Rewrite trait