C Will Not Die

Pacsfury — Sat, 31 Oct 2026 14:12:52 +0000

In recent years, a lot of new programming languages have been made as a "replacement for C". In this post, I want to share my point of view on the topic.

But what are the alternatives?

There have been a lot of alternatives to C, all of them trying to fix a specific part of it. The most famous ones are:

Rust: Wants to fix memory safety without a garbage collector.
Zig: Wants to be simple and transparent about what it does.
Go: A modern alternative for systems and networked services. It trades absolute bare-metal control for a garbage collector and powerful built-in concurrency.

There are some more, like C3, Nim, or D.

Which has more potential?

Right now, the most famous one is, without a doubt, Rust. It uses a unique borrow checker tracking system to guarantee compile-time memory safety.

It has, though, a pretty steep learning curve if you are coming from C/C++, because there are so many new things to learn and understand about memory safety that C just doesn't have.

Zig has also become really popular, as has Go, but this last one is used more for backend and concurrent systems than low-level programming like Rust.

But then, why won't C die?

Rust is safer, and Zig has a built-in C compiler. This seems like the end of the C programming language. But I think not.

C is the foundation of all modern software. Most AI frameworks are used in Python, which is written in C. The same goes for the Linux kernel and a lot of other kernels, operating systems, and languages.

And for the future? C will still be needed. Sometimes we need speed, but also a freedom that Rust does not give (let me decide how I want my enums!), or a simplicity that neither Rust nor Zig truly has.

Greenfield vs. Legacy: The Reality of Software

It is easy to start a new project in Rust or Zig today and praise its advantages. However, rewriting billions of lines of existing C code is economically and practically impossible.

Companies prefer to maintain stable, decade-old C codebases rather than risk introducing new bugs during a rewrite. This means that even if no one wrote a single new line of C from today onwards, C developers would still be needed for the next 30 to 40 years just to maintain the infrastructure of the world.

The Universal Language of Software

There is another reason C won't die: its ABI (Application Binary Interface). Almost every modern programming language —including Rust, Python, and Go— knows how to talk to C code out of the box.

C is the "lingua franca" of computing. If you want to connect two different systems, you usually do it through a C interface. Ironically, to be successful, newcomers like Zig and Rust have to spend a lot of effort being backward-compatible with C. C doesn't need to adapt to them; they must adapt to C.

Conclusion: Evolution, Not Extinction

In the end, languages like Rust or Zig won't kill C; they will coexist with it. C will remain the bedrock of legacy systems, compilers, and ultra-low-level hardware, while newer languages will be used to build the secure, high-performance layers on top of it. C isn't dying; its role is just evolving from "the only systems language" to "the foundation of all systems."

"C Will Not Die" and other posts