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wtf is mrustc?

take-cheeze/mrustc — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2020-09-18

C++Audience · researcherComplexity · 5/5DormantSetup · hard

TL;DR

mrustc is an experimental alternative Rust compiler written in C++ that translates Rust code to C, proving an independent Rust compiler is possible.

Mindmap

mindmap
  root((repo))
    What it does
      Compiles Rust code
      Skips borrow checker
      Outputs C code
    Tech stack
      C++
      Rust
      C compiler backend
    Use cases
      Study compiler design
      Build rustc itself
      Experiment on new platforms
    Audience
      Compiler enthusiasts
      Researchers
    Status
      Experimental
      Active roadmap

Code map

Detail Auto

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filefunction / class

Why would anyone build with this?

REASON 1

Study how a Rust compiler can be built without deep Rust or LLVM knowledge

REASON 2

Experiment with compiling Rust programs on platforms where the official compiler struggles

REASON 3

Build your own Rust projects while working around current limitations

REASON 4

Explore translating Rust to C as an intermediate compilation step

What's in the stack?

C++RustC

How it stacks up

take-cheeze/mrustcachanana/mavsdkalange/llama.cpp
Stars——0
LanguageC++C++C++
Last pushed2020-09-182024-05-20—
MaintenanceDormantDormant—
Setup difficultyhardmoderatemoderate
Complexity5/54/54/5
Audienceresearcherdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · hard Time to first run · 1day+

Experimental and mainly Linux-tested, expect to work around limitations to build real projects.

Yoink these prompts

Prompt 1
Explain how mrustc compiles Rust code into C without implementing a borrow checker, and why that still produces correct programs.
Prompt 2
Walk me through building the Rust standard library using mrustc on Linux.
Prompt 3
Show me how mrustc's Rust-to-C translation approach differs from the official rustc compiler pipeline.
Prompt 4
Help me understand mrustc's roadmap for adding a borrow checker and new codegen backends.

Frequently asked questions

wtf is mrustc?

mrustc is an experimental alternative Rust compiler written in C++ that translates Rust code to C, proving an independent Rust compiler is possible.

What language is mrustc written in?

Mainly C++. The stack also includes C++, Rust, C.

Is mrustc actively maintained?

Dormant — no commits in 2+ years (last push 2020-09-18).

How hard is mrustc to set up?

Setup difficulty is rated hard, with roughly 1day+ to a first successful run.

Who is mrustc for?

Mainly researcher.

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