CompCert

{{primary sources|date=February 2018}}

{{Short description|Formally verified C compiler}}

{{Infobox software

| name = CompCert

| author = Xavier Leroy, Sandrine Blazy

| developer = AbsInt

| released = {{Start date and age|2005}}

| latest release version = {{wikidata|property|P348}}

| latest release date = {{wikidata|qualifier|P348|P577}}{{wikidata|reference|Q5155256|P348}}

| genre = Compiler

| license = free for noncommercial use{{Cite web|url=http://compcert.inria.fr/doc/LICENSE.txt|title=CompCert License}}

| website = {{Official URL}}

}}

{{Expand section|date=February 2018}}

CompCert is a formally verified optimizing compiler for a large subset of the C99 programming language (known as Clight) which currently targets PowerPC, ARM, RISC-V, x86 and x86-64[https://github.com/AbsInt/CompCert/releases/tag/v3.0 v3.0 Release Notes] architectures.[http://compcert.inria.fr/compcert-C.html CompCert Website] This project, led by Xavier Leroy, started officially in 2005, funded by the French institutes ANR and INRIA. The compiler is specified, programmed and proven in the Rocq proof assistant. It aims to be used for programming embedded systems requiring reliability. The performance of its generated code is often close to that of GCC (version 3) at optimization level -O1, and always better than that of GCC without optimizations.[http://compcert.inria.fr/compcert-C.html#perfs CompCert Performance]

Since 2015, AbsInt offers commercial licenses,{{Cite web|url=http://compcert.inria.fr/partners.html|title=CompCert - Partners|website=compcert.inria.fr|access-date=2019-03-21}} provides support and maintenance, and contributes to the advancement of the tool. CompCert is released under a noncommercial license, and is therefore not free software, although some of its source files are dual-licensed with the GNU Lesser General Public License version 2.1 or later or are available under the terms of other licenses.

For the development of CompCert, the first practically useful optimizing compiler targeting multiple commercial architectures that has a complete, mechanically checked proof of its correctness, Xavier Leroy and the development team of CompCert received the 2021 ACM Software System Award.