SPEC benchmarks depend on undocumented C behaviour: http://t.co/9zkybqwM9N -- compiler benchmarking takes real language lawyering.
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I would have thought that invoking a C compiler would be a solved problem. Looking at Rust's cc crate there's a remarkable long tail of corner cases to fix.
Exotic CPUs, microarchitectures, compiler differences, operating system differences, etc.
https://github.com/rust-lang/cc-rs/blob/main/CHANGELOG.md
Some delightful examples of good compiler error messages in the latest Gleam release: https://gleam.run/news/context-aware-compilation/
C++ no longer considers trivial infinite loops to be undefined behaviour! https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2809r3.html
Spotted in the release notes for the latest clang.