Build and install a conda package with rattler-build

.gitignore

# build products
output/
example
# pixi environments
.pixi
*.egg-info

README.md

Build and install a conda package with rattler-build

Setup

pixi global install rattler-build  # good to have anyway

micromamba env create --yes --file environment.yml
micromamba activate local-conda-package-install-example

Build

rattler-build build  # defaults to --recipe recipe.yaml

$ tree -L 2 output/
output/
├── bld
│   └── rattler-build_xtensor_1723239688
├── linux-64
│   ├── repodata.json
│   └── xtensor-0.24.6-hb0f4dca_0.conda
├── noarch
│   └── repodata.json
└── src_cache
    ├── 0_24_6_f87259b5
    └── 0_24_6_f87259b5.tar.gz

6 directories, 4 files

Install

micromamba install --channel ./output/ xtensor

Use

# Linux
$ g++ -I $CONDA_PREFIX/include/ example.cpp -o example
# macOS
$ clang++ -I $CONDA_PREFIX/include/ example.cpp -o example
$ ./example
# {  7.,  11.,  14.}

References

• https://github.com/prefix-dev/rattler-build/blob/7817d758993e34966c2b4bf27338f3bf611251f9/README.md#the-recipe-format
• https://xtensor.readthedocs.io/en/latest/getting_started.html#first-example

environment.yml

name: local-conda-package-install-example
channels:
  - conda-forge
dependencies:
  - rattler-build >=0.19.0
  - cxx-compiler >=1.7.0

example.cpp

#include <iostream>
#include <xtensor/xarray.hpp>
#include <xtensor/xio.hpp>
#include <xtensor/xview.hpp>

int main(int argc, char* argv[])
{
    xt::xarray<double> arr1
      {{1.0, 2.0, 3.0},
       {2.0, 5.0, 7.0},
       {2.0, 5.0, 7.0}};

    xt::xarray<double> arr2
      {5.0, 6.0, 7.0};

    xt::xarray<double> res = xt::view(arr1, 1) + arr2;

    std::cout << res << std::endl;

    return 0;
}

recipe.yaml

# yaml-language-server: $schema=https://raw.githubusercontent.com/prefix-dev/recipe-format/main/schema.json

context:
  name: xtensor
  version: 0.24.6

package:
  name: ${{ name|lower }}
  version: ${{ version }}

source:
  url: https://github.com/xtensor-stack/xtensor/archive/${{ version }}.tar.gz
  sha256: f87259b51aabafdd1183947747edfff4cff75d55375334f2e81cee6dc68ef655

build:
  number: 0
  script:
    - if: win
      then: |
        cmake -G "Ninja" -D BUILD_TESTS=OFF -D CMAKE_INSTALL_PREFIX=%LIBRARY_PREFIX% %SRC_DIR%
        ninja install
      else: |
        cmake ${CMAKE_ARGS} -G "Ninja" -DBUILD_TESTS=OFF -DCMAKE_INSTALL_PREFIX=$PREFIX $SRC_DIR -DCMAKE_INSTALL_LIBDIR=lib
        ninja install

requirements:
  build:
    - ${{ compiler('cxx') }}
    - cmake
    - ninja
  host:
    - xtl >=0.7,<0.8
  run:
    - xtl >=0.7,<0.8
  run_constraints:
    - xsimd >=8.0.3,<10

tests:
  - script:
    - if: unix or emscripten
      then:
        - test -d ${PREFIX}/include/xtensor
        - test -f ${PREFIX}/include/xtensor/xarray.hpp
        - test -f ${PREFIX}/share/cmake/xtensor/xtensorConfig.cmake
        - test -f ${PREFIX}/share/cmake/xtensor/xtensorConfigVersion.cmake
    - if: win
      then:
        - if not exist %LIBRARY_PREFIX%\include\xtensor\xarray.hpp (exit 1)
        - if not exist %LIBRARY_PREFIX%\share\cmake\xtensor\xtensorConfig.cmake (exit 1)
        - if not exist %LIBRARY_PREFIX%\share\cmake\xtensor\xtensorConfigVersion.cmake (exit 1)

about:
  homepage: https://github.com/xtensor-stack/xtensor
  license: BSD-3-Clause
  license_file: LICENSE
  summary: The C++ tensor algebra library
  description: Multi dimensional arrays with broadcasting and lazy computing
  documentation: https://xtensor.readthedocs.io
  repository: https://github.com/xtensor-stack/xtensor

extra:
  recipe-maintainers:
    - some-maintainer