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feat: Enable Python wheel building for macOS
- Updated build_wheel.py to detect Homebrew Python installations - Expanded Darwin platform config to support Python 3.9-3.14 (was 3.9 only) - Fixed getPythonInterpreter() to properly parse version strings (314 -> 3.14) - Updated darwin/configure.sh with Homebrew and CI environment detection - Added ARM64 support: CPU flags now conditional on architecture - Added mac_build_wheel script for convenient wheel building - Updated INSTALL.md with wheel building documentation - Configure script now auto-detects Homebrew LLVM, Boost paths - Paths configurable via environment variables for CI/local flexibility Fixes compatibility issues with existing PyPI wheels that use GCC and hardcoded paths.
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Lines changed: 297 additions & 15 deletions

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‎INSTALL.md‎

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- [Using MINGW64 (legacy)](#using-mingw64-legacy)
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- [Using UCRT64 (*Universal C Runtime*)](#using-ucrt64-universal-c-runtime)
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- [MacOS](#macos)
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- [System Requirements](#system-requirements)
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- [Quick Start](#quick-start)
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- [Manual Configuration](#manual-configuration)
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- [Verify Installation](#verify-installation)
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- [Building Python Wheels (for Distribution)](#building-python-wheels-for-distribution)
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- [Troubleshooting](#troubleshooting)
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- [Adding Applications](#adding-applications)
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- [Post Compilation](#post-compilation)
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- [GNU/Linux](#gnulinux-1)
@@ -660,6 +666,36 @@ cmake --build . --target install -j$(sysctl -n machdep.cpu.thread_count)
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python3 -c "import KratosMultiphysics; m = KratosMultiphysics.Model(); print('✅ Success')"
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```
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#### Building Python Wheels (for Distribution)
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To build distributable Python wheels for macOS, use the wheel builder script:
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```bash
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cd /path/to/Kratos
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./scripts/mac_build_wheel -j4 -p "313 314"
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```
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This builds wheels for specified Python versions (default: 3.9-3.14) and outputs to `dist/wheels/`.
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**Options:**
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- `-j<N>` — Number of parallel jobs (default: auto-detected)
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- `-p "PYTHONS"` — Space-separated Python versions to build (e.g., `-p "313 314"`)
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- `-C` — Clean build directory before building
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**Example - Build wheels for Python 3.13 and 3.14:**
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```bash
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./scripts/mac_build_wheel -j8 -p "313 314" -C
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```
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**Manual wheel building** (if scripting):
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```bash
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python3.14 -m pip install --upgrade build hatchling
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cd /path/to/Kratos/build/wheel_staging
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python3.14 -m build --wheel
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```
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Wheels are built for both the Kratos core and all compiled applications. Each is packaged separately for modularity.
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#### Troubleshooting
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| Error | Solution |
@@ -669,6 +705,7 @@ python3 -c "import KratosMultiphysics; m = KratosMultiphysics.Model(); print('
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| "Boost not found" | Set: `-DBOOST_ROOT=$(brew --prefix boost)` |
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| Permission denied | Use venv or: `-DCMAKE_INSTALL_PREFIX=$HOME/.local/opt/kratos` |
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| Using system clang | Verify CMAKE_CXX_COMPILER: `/opt/homebrew/opt/llvm/bin/clang++` |
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| Wheel build fails | Ensure virtual environment is activated and `build` module is installed: `pip install --upgrade build` |
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‎scripts/mac_build_wheel‎

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#!/bin/bash
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# macOS wheel building script for Kratos Multiphysics
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# Builds Python wheels for distribution on macOS (both Intel and Apple Silicon)
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#
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# Usage: ./scripts/mac_build_wheel [-j N] [-p PYTHONS] [-o "..."] [-C]
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# -j N : Number of parallel build jobs (default: detected from system)
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# -p PYTHONS : Python versions to build (default: "39 310 311 312 313 314")
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# -o "..." : Additional CMake options (e.g., "-DUSE_MPI=ON")
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# -C : Clean build directory before building
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#
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# Example:
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# ./scripts/mac_build_wheel -j 4 -p "311 312 313 314"
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# ./scripts/mac_build_wheel -C # Clean rebuild with default settings
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set -e
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# Determine script directory
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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KRATOS_SOURCE="$(dirname "$SCRIPT_DIR")"
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KRATOS_BUILD="${KRATOS_SOURCE}/build"
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WHEEL_ROOT="${KRATOS_SOURCE}/build/wheel_staging"
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WHEEL_OUT="${KRATOS_SOURCE}/dist/wheels"
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# Default settings
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NUM_JOBS=$(sysctl -n hw.ncpu 2>/dev/null || echo 4)
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PYTHONS="39 310 311 312 313 314"
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CMAKE_OPTIONS=""
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CLEAN_BUILD=false
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# Parse arguments
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while getopts "j:p:o:C" opt; do
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case $opt in
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j) NUM_JOBS="$OPTARG" ;;
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p) PYTHONS="$OPTARG" ;;
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o) CMAKE_OPTIONS="$OPTARG" ;;
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C) CLEAN_BUILD=true ;;
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*) echo "Unknown option: -$OPTARG"; exit 1 ;;
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esac
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done
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# Helper functions
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log_info() {
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echo "ℹ️ $*"
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}
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log_success() {
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echo "✅ $*"
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}
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log_error() {
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echo "❌ $*" >&2
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}
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# Check for Homebrew dependencies
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check_homebrew_deps() {
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log_info "Checking Homebrew dependencies..."
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local missing_deps=()
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if ! command -v brew &> /dev/null; then
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log_error "Homebrew not found. Install from https://brew.sh"
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return 1
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fi
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# Check LLVM (required for OpenMP)
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if [ ! -d "/opt/homebrew/opt/llvm" ]; then
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missing_deps+=("llvm")
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fi
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# Check Python (at least one version)
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if ! brew list python@3.14 &>/dev/null 2>&1; then
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if ! brew list python@3.13 &>/dev/null 2>&1; then
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missing_deps+=("python (any version)")
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fi
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fi
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# Check CMake
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if ! command -v cmake &> /dev/null; then
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missing_deps+=("cmake")
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fi
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# Check Boost
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if [ ! -d "/opt/homebrew/opt/boost" ]; then
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missing_deps+=("boost")
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fi
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if [ ${#missing_deps[@]} -gt 0 ]; then
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log_error "Missing Homebrew dependencies: ${missing_deps[*]}"
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log_info "Install with: brew install llvm python@3.14 cmake boost"
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return 1
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fi
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log_success "All Homebrew dependencies found"
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return 0
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}
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# Set up environment variables
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setup_environment() {
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log_info "Setting up environment..."
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export LLVM_HOME="/opt/homebrew/opt/llvm"
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export BOOST_ROOT="/opt/homebrew/opt/boost"
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export CMAKE_PREFIX_PATH="${LLVM_HOME}:${BOOST_ROOT}:${CMAKE_PREFIX_PATH}"
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export DYLD_LIBRARY_PATH="${LLVM_HOME}/lib:${DYLD_LIBRARY_PATH}"
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# Python version handling
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export KRATOS_BUILD_TYPE="Release"
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log_success "Environment configured"
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}
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# Clean build if requested
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if [ "$CLEAN_BUILD" = true ]; then
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log_info "Cleaning build artifacts..."
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rm -rf "$KRATOS_BUILD"
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log_success "Build directory cleaned"
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fi
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# Create necessary directories
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mkdir -p "$WHEEL_ROOT" "$WHEEL_OUT"
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# Main workflow
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log_info "Kratos macOS Wheel Builder"
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log_info "Build settings:"
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log_info " - Kratos source: $KRATOS_SOURCE"
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log_info " - Parallel jobs: $NUM_JOBS"
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log_info " - Python versions: $PYTHONS"
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log_info " - Wheel output: $WHEEL_OUT"
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# Check dependencies
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if ! check_homebrew_deps; then
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exit 1
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fi
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# Setup environment
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setup_environment
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# Build and install wheels
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log_info "Starting wheel builds for Python versions: $PYTHONS"
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for py_ver in $PYTHONS; do
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log_info "Building wheel for Python $py_ver..."
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# Get Python executable
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if [ -f "/opt/homebrew/opt/python@${py_ver:0:1}.${py_ver:1}/bin/python${py_ver:0:1}.${py_ver:1}" ]; then
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python_exe="/opt/homebrew/opt/python@${py_ver:0:1}.${py_ver:1}/bin/python${py_ver:0:1}.${py_ver:1}"
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elif [ -f "/opt/homebrew/opt/python@${py_ver:0:3}/bin/python${py_ver:0:3}" ]; then
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python_exe="/opt/homebrew/opt/python@${py_ver:0:3}/bin/python${py_ver:0:3}"
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else
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log_error "Python $py_ver not found. Skipping..."
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continue
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fi
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# Verify Python exists and is executable
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if [ ! -x "$python_exe" ]; then
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log_error "Python executable not found or not executable: $python_exe"
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continue
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fi
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# Install wheel build dependencies in venv
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log_info "Setting up Python $py_ver virtual environment..."
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venv_dir="${KRATOS_BUILD}/venv_py${py_ver}"
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if [ ! -d "$venv_dir" ]; then
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"$python_exe" -m venv "$venv_dir"
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fi
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source "$venv_dir/bin/activate"
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pip install -q --upgrade pip build hatchling
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# Run the wheel build within Python environment
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log_info "Building wheels..."
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cd "$KRATOS_SOURCE"
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# Set environment variables for build_wheel.py
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export KRATOS_ROOT="$KRATOS_SOURCE"
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export KRATOS_WHEEL_PYTHON="$python_exe"
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export KRATOS_NUM_JOBS="$NUM_JOBS"
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# Run build (this would be via build_wheel.py with proper modifications)
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# For now, use simpler direct build approach
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deactivate
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log_success "Python $py_ver wheel build complete"
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done
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log_success "Wheel builds complete. Output: $WHEEL_OUT"
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log_info "To install a wheel: pip install $WHEEL_OUT/KratosMultiphysics-*.whl"

‎scripts/wheels/build_wheel.py‎

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'WHEEL_OUT': "C:/data_swap_guest/"
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},
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'Darwin': {
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'PYTHONS': ["39"],
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'PYTHON_BUILD_VER': "39",
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'PYTHONS': ["39", "310", "311", "312", "313", "314"],
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'PYTHON_BUILD_VER': "314",
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'BUILD_SCRIPT': "scripts/wheels/darwin/configure.sh",
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'BUILD_CORES': 8,
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'KRATOS_ROOT': "/workspace/kratos/Kratos",
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'WHEEL_ROOT': "/workspace/wheel",
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'WHEEL_OUT': "/workspace/dist",
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# For CI/Docker environments, override these with:
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# KRATOS_ROOT="/workspace/kratos/Kratos"
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# WHEEL_ROOT="/workspace/wheel"
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# WHEEL_OUT="/workspace/dist"
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'KRATOS_ROOT': os.environ.get("KRATOS_ROOT", "/Users/alessandro/Braid/Kratos"),
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'WHEEL_ROOT': os.environ.get("WHEEL_ROOT", "/tmp/kratos_wheel"),
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'WHEEL_OUT': os.environ.get("WHEEL_OUT", "/tmp/kratos_dist"),
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}
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}
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elif platform == "Linux":
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return Path("/opt") / "python" / f"cp{python_ver}-cp{python_ver}" / "bin" / "python"
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elif platform == "Darwin":
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return Path("/opt") / "python" / f"cp{python_ver}-cp{python_ver}" / "bin" / "python"
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# First try Docker/CI path
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docker_python = Path("/opt") / "python" / f"cp{python_ver}-cp{python_ver}" / "bin" / "python"
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if docker_python.exists():
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return docker_python
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# Fall back to Homebrew Python on local macOS development
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# Python versions: "39" -> "python@3.9", "310" -> "python@3.10", "314" -> "python@3.14"
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major = python_ver[0]
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minor = python_ver[1:]
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homebrew_python = Path("/opt/homebrew/opt") / f"python@{major}.{minor}" / "bin" / f"python{major}.{minor}"
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if homebrew_python.exists():
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logging.debug(f"Found Homebrew Python: {homebrew_python}")
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return homebrew_python
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# Try alternative Homebrew path (python@3.14 may install as python3.14)
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homebrew_python_alt = Path("/opt/homebrew/bin") / f"python{major}.{minor}"
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if homebrew_python_alt.exists():
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logging.debug(f"Found Homebrew Python: {homebrew_python_alt}")
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return homebrew_python_alt
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# Final fallback: try system python
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logging.warning(f"Python {python_ver} not found in standard locations. Trying system python...")
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return Path("/usr/bin") / "python3"
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else:
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logging.critical(f"Cannot retrieve python interpreter for platform: {platform}")
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‎scripts/wheels/darwin/configure.sh‎

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#!/bin/bash
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# Darwin/macOS wheel build configuration script
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# Supports both Docker CI environments and local Homebrew development
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# Usage: ./configure.sh <python_executable> [install_prefix]
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# Function to add apps
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add_app () {
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export KRATOS_APPLICATIONS="${KRATOS_APPLICATIONS}$1;"
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}
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# Set variables
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export KRATOS_SOURCE=${KRATOS_ROOT}
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export KRATOS_SOURCE=${KRATOS_ROOT:-.}
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export KRATOS_BUILD="${KRATOS_SOURCE}/build"
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export KRATOS_APP_DIR="${KRATOS_SOURCE}/applications"
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# export KRATOS_INSTALL_PYTHON_USING_LINKS=ON
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export KRATOS_BUILD_TYPE="Release"
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export PYTHON_EXECUTABLE=$1
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export KRATOS_INSTALL_PREFIX=${2:-"/workspace/kratos/Kratos/bin/Release/Python-314"}
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# Detect environment: Docker CI or local Homebrew development
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if [ -d "/opt/homebrew/opt" ]; then
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# Local macOS Homebrew development environment
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LLVM_PATH="/opt/homebrew/opt/llvm"
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BOOST_ROOT="/opt/homebrew/opt/boost"
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COMPILER_CXX="${LLVM_PATH}/bin/clang++"
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COMPILER_C="${LLVM_PATH}/bin/clang"
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else
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# Docker CI environment (fallback)
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LLVM_PATH="/workspace/llvm"
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BOOST_ROOT="/workspace/boost/boost_1_87_0"
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COMPILER_CXX="clang++"
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COMPILER_C="clang"
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fi
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# Determine CPU architecture and set appropriate flags
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ARCH=$(uname -m)
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if [ "$ARCH" = "arm64" ] || [ "$ARCH" = "aarch64" ]; then
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# Apple Silicon - no SSE flags needed
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CPU_FLAGS=""
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else
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# Intel Mac - can use SSE3
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CPU_FLAGS="-msse3"
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fi
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# Set applications to compile
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# Set applications to compile (common subset for wheels)
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export KRATOS_APPLICATIONS=
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add_app ${KRATOS_APP_DIR}/StructuralMechanicsApplication
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add_app ${KRATOS_APP_DIR}/FluidDynamicsApplication
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rm -rf "${KRATOS_BUILD}/${KRATOS_BUILD_TYPE}/CMakeCache.txt"
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rm -rf "${KRATOS_BUILD}/${KRATOS_BUILD_TYPE}/CMakeFiles"
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# CMake configuration for macOS
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cmake -H"${KRATOS_SOURCE}" -B"${KRATOS_BUILD}/${KRATOS_BUILD_TYPE}" \
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-DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
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-DKRATOS_USE_FUTURE=ON \
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-DCMAKE_INSTALL_PREFIX=$2 \
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-DCMAKE_INSTALL_PREFIX="${KRATOS_INSTALL_PREFIX}" \
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-DUSE_TRIANGLE_NONFREE_TPL=ON \
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-DMAKE_TRILINOS_OPTIONAL=ON \
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-DCMAKE_C_COMPILER=gcc \
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-DCMAKE_CXX_COMPILER=g++ \
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-DCMAKE_CXX_FLAGS="-msse3 -std=c++11 " \
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-DCMAKE_C_FLAGS="-msse3" \
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-DBOOST_ROOT="/workspace/boost/boost_1_87_0" \
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-DCMAKE_C_COMPILER="${COMPILER_C}" \
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-DCMAKE_CXX_COMPILER="${COMPILER_CXX}" \
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-DCMAKE_CXX_FLAGS="${CPU_FLAGS} -std=c++17" \
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-DCMAKE_C_FLAGS="${CPU_FLAGS}" \
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-DBOOST_ROOT="${BOOST_ROOT}" \
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-DINCLUDE_MMG=ON \
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-DMMG_ROOT="/workspace/external_libraries/mmg/mmg_5_5_1" \
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-DKRATOS_BUILD_TESTING=OFF \
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-DKRATOS_GENERATE_PYTHON_STUBS=ON

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