---
id: fckitlib
version: "0.14.2.19"
license: unclear
license_treatment: unclear
maintenance: active
---

# fckitlib — "fckitlib"

License: unclear · Maintenance: active · Downloads: 84.1K/mo

## What it is and what it does

FCKit is a Fortran toolkit designed to simplify interoperability between Fortran and C/C++ codebases. It includes a unit testing framework (fctest) that uses C preprocessor macros to streamline test writing, bundling tests into Fortran modules and auto-generating a main program via Python and CMake. The package also wraps useful algorithms from ecKit and provides Fortran modules for MPI and logging in mixed-language applications.

The package is distributed as pre-built wheels for multiple Python versions and platforms (macOS and Linux), but its primary use is within CMake-driven Fortran build systems rather than as a standalone Python library. Installation involves medium friction due to compiled dependencies and platform-specific wheels. It is actively maintained and carries no known security vulnerabilities.

Use it for:

- Writing unit tests for Fortran code using preprocessor macros and CMake integration without manual boilerplate.
- Building mixed Fortran/C++ applications that need MPI communication and logging infrastructure.
- Wrapping ecKit algorithms in Fortran for numerical or scientific computing workflows.
- Offline deployment of Fortran projects by pre-downloading platform-specific wheels for air-gapped systems.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides Fortran modules and a unit testing framework for building mixed-language applications that interoperate between Fortran and C/C++, wrapping algorithms from ecKit.

Yes, if you are building a Fortran project with CMake and need a lightweight unit testing framework or mixed-language interop support. No, if you are looking for a pure Python library—this is a Fortran toolkit distributed via PyPI for build-system convenience. License terms are unclear, so verify licensing before use in proprietary code.

## Install

pip install fckitlib
uv add fckitlib
poetry add fckitlib

## Installing fckitlib

Before you install: Medium install friction due to compiled wheels across multiple Python versions and architectures (cp310–cp314, macOS arm64/x86_64, manylinux_2_28). Actively maintained with a recent release.

Quickstart:

pip install fckitlib

In CMakeLists.txt:
ecbuild_add_option( FEATURE FCTEST  DEFAULT ${ENABLE_TESTS}
                    DESCRIPTION "Fortran Unit Testing Framework"
                    REQUIRED_PACKAGES "NAME fckit" )

Requires CMake and ecbuild build system integration; intended for Fortran projects, not standalone Python use.

Verify before relying:

- Whether eckitlib (the sole runtime dependency) is a separate package or a bundled component.
- Exact license terms—license_treatment is 'unclear' and no SPDX identifier is present.
- Python version support—requires_python is unspecified despite wheels for cp310–cp314.

## Package facts

- License: not declared (unclear)
- Python support: unspecified
- Install friction: medium
- Maintenance: active
- Downloads: 84.1K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

fortran c++ interop, fortran unit testing, mixed language fortran, fortran mpi logging, fortran cmake testing, fortran-interop, cmake-integration, unit-testing

[View on SkillFed](https://skillfed.io/packages/fckitlib) · [View on PyPI](https://pypi.org/project/fckitlib/)