Pre-release

This release is a pre-release and may not be stable for production use.

cppjit: automatic Python-C++ interop and bindings

cppjit embeds an interactive C++ JIT compiler in Python: write or import C++ at run time and use its functions, classes, and templates as if they were Python. In contrast to binding libraries such as pybind11 and nanobind, there is no wrapper code to write and no CMake build to set up: bindings materialize automatically on demand, derived from the C++ declarations. Run-time binding generation enables:

Detailed specialization of each call at the point of use
Lazy loading for reduced memory use in large-scale projects
Python-side cross-inheritance and callbacks for working with C++ frameworks
Run-time template instantiation, so the binding surface never has to be enumerated ahead of time
Automatic object downcasting and exception mapping
Interactive exploration of C++ libraries from the Python prompt

cppjit supports user-developed C++ frameworks and third-party C++ libraries from standard package managers, and lets you use them from a Python application or build a Python-based DSL on top. cppjit is the successor project of cppyy, rebuilt on CppInterOp and the clang-repl C++ interpreter in LLVM. See the CHEP 2026 and the EuroLLVM 2026 talks for more details.

Source code: https://github.com/compiler-research/cppjit
Bug reports: https://github.com/compiler-research/cppjit/issues
Changelog: https://github.com/compiler-research/cppjit/releases

Examples

A CPython extension builds Python proxies for all C++ entities: functions, classes, templates, and variables. Constructors, operators, and data members follow Python conventions. The embedded JIT lazily compiles the C++ behind each proxy:

import cppjit

cppjit.cppdef("""
struct Vec2 {
    double x, y;
    Vec2 operator+(const Vec2& o) const { return {x + o.x, y + o.y}; }
};""")

c = cppjit.gbl.Vec2(1, 2) + cppjit.gbl.Vec2(3, 4)
c.x, c.y                 # (4.0, 6.0)

Templates instantiate on demand, and STL containers behave like Python containers:

cppjit.cppdef("""
#include <algorithm>
template <typename T>
T largest(const std::vector<T>& xs) { return *std::max_element(xs.begin(), xs.end()); }
""")

v = cppjit.gbl.std.vector['int']([3, 1, 4, 1, 5])
cppjit.gbl.largest(v)    # 5; largest<int> is compiled at this call
len(v), list(v)          # vectors support len(), iteration, indexing

Python callables pass into C++ as function pointers:

cppjit.cppdef("""
template <typename R, typename... U, typename... A>
R callme(R (*f)(U...), A &&...args) {
  return f(args...);
}""")

def callback(x: int, y: float) -> float:
    return x + y

cppjit.gbl.callme(callback, 123, 321.5)   # 444.5

NumPy arrays pass zero-copy; the C++ side works on the same buffer:

import numpy as np
a = np.arange(6, dtype=np.float64)

cppjit.cppdef("void scale(double* xs, std::size_t n, double f) { while (n--) xs[n] *= f; }")
cppjit.gbl.scale(a, a.size, 10.0)
a                        # array([ 0., 10., 20., 30., 40., 50.]); same buffer, no copy

An installed library binds at run time, with no binding code written for it:

import cppjit
cppjit.include('zlib.h')          # bring in the declarations
cppjit.load_library('libz')       # load the symbols
cppjit.gbl.zlibVersion()          # '1.3'; call the library directly

CppInterOp drives Clang and provides the necessary run-time reflection and JIT compilation API for cppjit.

Use cases

Numerics and data science: move performance-critical code into C++ in the same session.
Template-heavy APIs: STL, Eigen, and user templates instantiate lazily at call sites.
Existing C++ codebases: use them from Python without modification.
Domain-specific languages: user-defined "pythonizations" adapt the bindings into Pythonic libraries.

Requirements

A package manager installation of cppjit (such as pip) requires GCC >= 9 or Clang >= 15 (the JIT compiles C++ against the host's standard library headers).

Building from source requires:

LLVM/Clang development packages, version 21 or 22
Python 3.12+ with development headers
CMake 3.20+
A C++20 compiler: g++ 13+, or a Clang matching the LLVM major (an older Clang fails to compile newer LLVM headers)
CppInterOp, cloned at build time or supplied from a local checkout (see the development builds below)

Source installation (pip)

Ubuntu 24.04

sudo apt-get update
sudo apt-get install -y git cmake make g++ python3-dev python3-venv python3-pip \
    wget lsb-release software-properties-common gnupg libzstd-dev libedit-dev
wget https://apt.llvm.org/llvm.sh && sudo bash llvm.sh 21
sudo apt-get install -y llvm-21-dev libclang-21-dev clang-21 libpolly-21-dev

python3 -m venv venv && source venv/bin/activate
git clone https://github.com/compiler-research/cppjit.git && cd cppjit
pip install -v . --config-settings=cmake.define.LLVM_DIR=/usr/lib/llvm-21/lib/cmake/llvm

macOS

brew install llvm@21 cmake ninja
python3 -m venv venv && source venv/bin/activate
git clone https://github.com/compiler-research/cppjit.git && cd cppjit
pip install -v . --config-settings=cmake.define.LLVM_DIR="$(brew --prefix llvm@21)/lib/cmake/llvm"

Development build (pip editable)

With the toolchain from the source installation above, an editable install with a persistent build directory gives incremental rebuilds:

export LLVM_DIR=/usr/lib/llvm-21/lib/cmake/llvm   # your LLVM's CMake directory
pip install scikit-build-core
pip install --no-build-isolation -ve . \
    --config-settings=build-dir=build \
    --config-settings=cmake.define.LLVM_DIR=$LLVM_DIR

To co-develop both CppInterOp and cppjit, clone CppInterOp next to cppjit and rerun the install with a separate build directory and --config-settings=cmake.define.CPPINTEROP_SOURCE_DIR=$PWD/../CppInterOp. The local checkout overrides the pinned tag, so new CppInterOp API is usable from cppjit immediately.

Development build (CMake)

The CMake build compiles and stages CppInterOp inside the build tree and assembles the Python package under <build>/python; point PYTHONPATH there instead of installing:

export LLVM_DIR=/usr/lib/llvm-21/lib/cmake/llvm   # your LLVM's CMake directory
cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DLLVM_DIR=$LLVM_DIR
cmake --build build -j
export PYTHONPATH=$PWD/build/python

A prebuilt CppInterOp (built shared with -DBUILD_SHARED_LIBS=ON and installed to a prefix) is consumed in place through CppInterOp_DIR instead of being rebuilt:

cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DLLVM_DIR=$LLVM_DIR \
    -DCppInterOp_DIR=$PWD/../CppInterOp/install/lib/cmake/CppInterOp

Running the test suite locally

pip install -r requirements.txt
cd test
make -j4                          # builds the *Dict.so loaded for tests
python -m pytest -ra --tb=short

Contributing

Bug reports, feature requests, and questions go to the issue tracker. Pull requests are welcome; run the test suite before submitting.

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0.1.0a1 This release

Sep 7, 2026 13 files

cppjit 0.1.0a1

cppjit: automatic Python-C++ interop and bindings

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