pyyggdrasil 0.0.18

Native dependency provider for Dominik Drexler's planning projects

Yggdrasil

pyyggdrasil packages the native dependency prefix used by the planning projects in this repository family.

The Python distribution name and import package are both pyyggdrasil.

pyyggdrasil is the base of the planning-and-learning package chain. The shared workspace layout, the layered install order, and the common build-from-source and CMake-integration patterns are documented in the Planning and Learning build instructions; the sections below cover pyyggdrasil-specific details.

Python Integration

Install the wheel and query the native prefix:

import pyyggdrasil

print(pyyggdrasil.native_prefix())
print(pyyggdrasil.cmake_prefix())  # prefix to put on CMAKE_PREFIX_PATH
print(pyyggdrasil.cmake_dir())     # directory containing yggdrasilConfig.cmake
print(pyyggdrasil.include_dir())
print(pyyggdrasil.library_dirs())
print(pyyggdrasil.cmake_dirs())

The same paths are available from the shell:

python -m pyyggdrasil --prefix
python -m pyyggdrasil --cmake-dir
python -m pyyggdrasil --include-dir
python -m pyyggdrasil --version

Python packages that consume this native prefix should depend on:

dependencies = [
    "pyyggdrasil>=0.0.18,<0.1",
]

The bundled shared libraries make the coupling ABI-level, so pin to the same minor version. The exported CMake package version file uses SameMinorVersion compatibility accordingly.

Build Python

Build a wheel from source:

uv build --wheel

The build creates dependencies-build/ and dependencies-install/. To package an existing native prefix without rebuilding dependencies:

YGGDRASIL_BUILD_NATIVE=OFF \
YGGDRASIL_NATIVE_PREFIX=/path/to/dependencies-install \
uv build --wheel

Set YGGDRASIL_JOBS to control the native dependency build parallelism.

Runtime libraries are stripped in the wheel by default. Disable that for debugging with:

YGGDRASIL_STRIP_WHEEL=OFF uv build --wheel

Build C++

Build the native dependency prefix directly with CMake:

cmake -S src -B dependencies-build \
  -DCMAKE_INSTALL_PREFIX=dependencies-install \
  -DCMAKE_INSTALL_LIBDIR=lib

cmake --build dependencies-build -j4
cmake --install dependencies-build

Yggdrasil builds its bundled dependencies as shared libraries. The native dependency prefix contains C++ headers, shared libraries, and CMake package configuration files consumed by the other projects.

CMake Integration

The wheel ships a CMake package config (yggdrasilConfig.cmake) defining the yggdrasil::yggdrasil interface target. It carries the include directory, C++20 as a compile feature, and the bundled dependencies (Boost, fmt, gtl, TBB) via find_dependency. (cista is consumed through the include directory only — its target exports compile definitions that would otherwise change cista's hashing and fmt integration.) Downstream CMake projects consume it through CMAKE_PREFIX_PATH:

cmake -S . -B build \
  -DCMAKE_PREFIX_PATH="$(python -m pyyggdrasil --prefix)"

find_package(yggdrasil 0.0.18 CONFIG REQUIRED)
target_link_libraries(my_target PRIVATE yggdrasil::yggdrasil)

For compiler invocations launched from Python, use pyyggdrasil.include_dir() for the C++ headers and pyyggdrasil.library_dirs() for installed native library directories.

fmt Formatters

Yggdrasil's public fmt::formatter specializations are guarded by the YGG_ENABLE_FMT_FORMATTERS macro, which defaults to 1 (yggdrasil/core/config.hpp). Consumers can opt out by defining YGG_ENABLE_FMT_FORMATTERS=0. For Yggdrasil's own builds, the YGGDRASIL_ENABLE_FMT_FORMATTERS CMake option (default ON) toggles the macro. The sibling libraries follow the same convention with LOKI_/TYR_/RUNIR_ENABLE_FMT_FORMATTERS, and each library's CMake option also toggles the macros of its upstream libraries.