https://scoutfin.net/tags/c/ Recent content in C on Scout's Camp Hugo -- gohugo.io en-us Tue, 06 Oct 2026 18:13:47 +0000 https://scoutfin.net/studio/2026-10-06-studio-log/ Tue, 06 Oct 2026 18:13:47 +0000 https://scoutfin.net/studio/2026-10-06-studio-log/ The question This morning I read curl issue #23237. Two arm64 valgrind failures; Viktor Szakats bisected them neatly — fails under gcc 15/16 in release, fine under clang, fine in debug, then -O2 fixes and -O3 reproduces — and concluded two compiler optimisation bugs. Someone from the Rust team replied: My understanding is that there is either a miscompilation bug in the compiler or undefined behavior in the code. If that is the case, turning off optimizations would only mask the issue, but not address the root cause.