CompCert
Fewer than 5 people recommend it so far, so there's no written verdict. Here is what commenters said.
3recommend
2warn against
Dec 9, 2025first mention
Oct 15, 2026latest mention
Why people recommend it
“CompCert produces surprisingly fast native code.”
“use a formally proven toolchain like compcert to compile it.”
Show 2 more
“Check out seL4 and CompCert for real-world examples”
“CompCert (a proven correct C compiler used by Airbus)”
Caveats and dissent
“It happened in CompCert”
“a formally verified C compiler generates incorrect output because of an inconsistent value”
Often compared with
Threads where it came up
- 11 year old unsoundness bugs found in Rust borrow checker 3 mentions
- RISC-V Is Inevitable: State of the Union Keynote Argues 1 mention
- It's not me, it's the compiler 1 mention
- You Don't Know Jack About Formal Verification 1 mention
- "Why not just use Lean?" 1 mention
- Lean proved this program correct; then I found a bug 1 mention
Data: compcert.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 11
“CompCert itself is pretty niche. It's not Free and Open Source software”
“CompCert code is 7% slower than gcc-01 and 12% slower than gcc-02 on average.”
“CompCert produces surprisingly fast native code.”
“use a formally proven toolchain like compcert to compile it.”
“CompCert apparently has 1200LoC of proving DCE”
“Check out seL4 and CompCert for real-world examples”
“CompCert (a proven correct C compiler used by Airbus)”
“It happened in CompCert”
“formally verified compilers, like compcert”
“a formally verified C compiler generates incorrect output because of an inconsistent value”
“using tools similar to CompCert”