Benign data races are scary, since C/C++ gives a compiler much freedom: https://software.intel.com/en-us/blogs/2013/01/06/benign-data-races-what-could-possibly-go-wrong
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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/
It's a small thing, but I'm much happier with the output of --version in the latest version of difftastic.
It shows the release version number, the commit hash, and the commit date. This gives you a sense of the age of release, but you still have a reproducible build (unlike build time).
It also shows OS, arch and compiler, because those are common requirements in bug reports.