C言語を爆速化する魔法？「CJIT」が登場！

C言語にJIT（Just-In-Time）コンパイルを導入する試み「CJIT」について。実行時に最適化を行うことで、さらなるパフォーマンス向上を目指す野心的なプロジェクトです。

Looks interesting and fun, but in no instance of any C compiler I've come across is the "classic example" of "hello, world" using fprintf(stderr, ...)

To each their own I guess.

Related:

Show HN: CJIT, a single-binary C compiler that can self host - https://news.ycombinator.com/item?id=47751458 (https://news.ycombinator.com/item?id=47751458) - April 2026 (1 comment)

C, Just in Time - https://news.ycombinator.com/item?id=42246209 (https://news.ycombinator.com/item?id=42246209) - Nov 2024 (7 comments)

(Pity the Show HN didn't get attention - we'll email the author)

Did you use Codex 5.4 for the web design? :p I think Codex tends to do very similar designs, could be completely mistaken tho

inspired by HolyC by Terry Davis

Definitely was not expecting this reference.

https://en.wikipedia.org/wiki/TempleOS#HolyC (https://en.wikipedia.org/wiki/TempleOS#HolyC)

https://en.wikipedia.org/wiki/Terry_A._Davis (https://en.wikipedia.org/wiki/Terry_A._Davis)

The site visually feels "compressed" due to the font used? It's a bit jarring. The tutorial link in the header nav doesn't go anywhere.

Cool idea.

I was wondering why the release explicitly is cjit-x86_64-ubuntu-24.04 instead of generic linux, but it does in fact appear to not work on Arch:

tcc: error: file '/lib/x86_64-linux-gnu/libgcc_s.so.1' not found

I'm guessing that's due to a dlopen since it's not listed by ldd

The TUI demos work great, but I couldn't get the SDL examples to resolve all the missing symbols after trying for a bit.

Pair this with Fil-C(https://fil-c.org/ (https://fil-c.org/)) and now you have C but as a truly bonafide scripting language.

Inspired by Terry. But does it glow?

What's different between tcc -run and CJIT?
The main difference is in usability.

CJIT improves three main UX aspects for now:

It works as a single executable file which embeds the TinyCC compiler, all its headers and its standard library. This way there is no need to install anything system wide, check paths and setup build folders.

It supports adding multiple files into one execution: can accept wildcards to ingest anything that is a C source, a pre-compiled object or a shared library. The symbols exported by each file will be visible to all during the same execution.

It finds automatically common system libraries for each target platform, avoiding the need to repeat these settings and look for the right paths.