build(cross): macOS cross compilation

macos cross compilation now works. macos binaries can be compiled on
linux with osxcross installed and built

.gitignore

@@ -119,3 +119,5 @@ meson-boost-test/
 *.json
 *.xml
 *_pynucastro_network.py
+
+cross/python_includes

build-config/meson.build

@@ -1,7 +1,8 @@
 cmake = import('cmake')
 
-subdir('fourdst')
 
+subdir('python')
+subdir('fourdst')
 subdir('sundials')
 
 subdir('cppad')

build-config/python/meson.build

@@ -0,0 +1,16 @@
+py_installation = import('python').find_installation('python3', pure: false)
+
+
+if meson.is_cross_build() and host_machine.system() == 'darwin'
+  py_ver = get_option('python-target-version')
+  message('Cross build on Darwin, using python version ' + py_ver)
+  py_inc_dir = include_directories('../../cross/python_includes/python-' + py_ver + '/include/python' + py_ver)
+  py_dep = declare_dependency(include_directories: py_inc_dir)
+  py_module_prefix = ''
+  py_module_suffic = 'so'
+  meson.override_dependency('python3', py_dep)
+else
+  py_dep = py_installation.dependency()
+  py_module_prefix = ''
+  py_module_suffic = 'so'
+endif

build-config/sundials/cvode/meson.build

@@ -6,9 +6,8 @@ cvode_cmake_options.add_cmake_defines({
     'CMAKE_C_FLAGS'     : '-Wno-deprecated-declarations',
     'BUILD_SHARED_LIBS' : 'OFF',
     'BUILD_STATIC_LIBS' : 'ON',
-    'CMAKE_BUILD_WITH_INSTALL_RPATH': 'ON',
     'EXAMPLES_ENABLE_C': 'OFF',
-    'CMAKE_POSITION_INDEPENDENT_CODE': 'ON'
+    'CMAKE_POSITION_INDEPENDENT_CODE': true
 
 })
 
@@ -22,29 +21,56 @@ cvode_sp = cmake.subproject(
     options: cvode_cmake_options,
 )
 
-# For the core SUNDIALS library (SUNContext, etc.)
+sundials_core_tgt = cvode_sp.target('sundials_core_static')
-sundials_core_dep = cvode_sp.dependency('sundials_core_static')
+sundials_cvode_tgt = cvode_sp.target('sundials_cvode_static')
+sundials_nvecserial_tgt = cvode_sp.target('sundials_nvecserial_static')
+sundials_sunmatrixdense_tgt = cvode_sp.target('sundials_sunmatrixdense_static')
+sundials_sunlinsoldense_tgt = cvode_sp.target('sundials_sunlinsoldense_static')
 
-# For the CVODE integrator library
+cvode_objs = [
-sundials_cvode_dep = cvode_sp.dependency('sundials_cvode_static')
+  sundials_core_tgt.extract_all_objects(recursive: true),
+  sundials_cvode_tgt.extract_all_objects(recursive: true),
+  sundials_nvecserial_tgt.extract_all_objects(recursive: true),
+  sundials_sunmatrixdense_tgt.extract_all_objects(recursive: true),
+  sundials_sunlinsoldense_tgt.extract_all_objects(recursive: true),
+]
 
-# For the serial NVector library
+sundials_core_includes = cvode_sp.include_directories('sundials_core_static')
-sundials_nvecserial_dep = cvode_sp.dependency('sundials_nvecserial_static')
+sundials_cvode_includes = cvode_sp.include_directories('sundials_cvode_static')
+sundials_nvecserial_includes = cvode_sp.include_directories('sundials_nvecserial_static')
+sundials_sunmatrixdense_includes = cvode_sp.include_directories('sundials_sunmatrixdense_static')
+sundials_sunlinsoldense_includes = cvode_sp.include_directories('sundials_sunlinsoldense_static')
 
-# For the dense matrix library
+cvode_includes = [
-sundials_sunmatrixdense_dep = cvode_sp.dependency('sundials_sunmatrixdense_static')
+  sundials_core_includes,
+  sundials_cvode_includes,
+  sundials_nvecserial_includes,
+  sundials_sunmatrixdense_includes,
+  sundials_sunlinsoldense_includes
+]
 
-# For the dense linear solver library
-sundials_sunlinsoldense_dep = cvode_sp.dependency('sundials_sunlinsoldense_static')
 
-cvode_dep = declare_dependency(
+empty_cvode_file = configure_file(
-    dependencies: [
+  output: 'cvode_dummy_ar.cpp',
-        sundials_core_dep,
+  command: ['echo'],
-        sundials_cvode_dep,
+  capture: true
-        sundials_nvecserial_dep,
+  )
-        sundials_sunmatrixdense_dep,
+
-        sundials_sunlinsoldense_dep,
+
-    ],
+
+libcvode_static = static_library(
+   'cvode-static',
+   empty_cvode_file,
+   objects: cvode_objs,
+   include_directories: cvode_includes,
+   pic: true,
+   install: false
+)
+
+
+cvode_dep = declare_dependency(
+  link_with: libcvode_static,
+  include_directories: cvode_includes,
 )
 
 

build-config/sundials/kinsol/meson.build

@@ -7,9 +7,8 @@ kinsol_cmake_options.add_cmake_defines({
     'CMAKE_C_FLAGS'     : '-Wno-deprecated-declarations',
     'BUILD_SHARED_LIBS' : 'OFF',
     'BUILD_STATIC_LIBS' : 'ON',
-    'CMAKE_BUILD_WITH_INSTALL_RPATH': 'ON',
     'EXAMPLES_ENABLE_C' : 'OFF',
-    'CMAKE_POSITION_INDEPENDENT_CODE': 'ON'
+    'CMAKE_POSITION_INDEPENDENT_CODE': true
 })
 
 kinsol_cmake_options.add_cmake_defines({
@@ -22,11 +21,31 @@ kinsol_sp = cmake.subproject(
     options: kinsol_cmake_options,
 )
 
-sundials_kinsol_shared = kinsol_sp.dependency('sundials_kinsol_static')
+sundials_kinsol_static_tgt = kinsol_sp.target('sundials_kinsol_obj_static')
+kinsol_includes = kinsol_sp.include_directories('sundials_kinsol_obj_static')
 
-kinsol_dep = declare_dependency(
+kinsol_objs = [sundials_kinsol_static_tgt.extract_all_objects(recursive: false)]
-    dependencies: [
+
-        sundials_kinsol_shared,
+empty_kinsol_file = configure_file(
-    ]
+  output: 'kinsol_dummy_ar.cpp',
+  command: ['echo'],
+  capture: true
+  )
+
+
+libkinsol_static = static_library(
+  'kinsol_static',
+  empty_kinsol_file,
+  objects: kinsol_objs,
+  include_directories: kinsol_includes,
+  pic: true,
+  install: false
 )
 
+
+kinsol_dep = declare_dependency(
+  link_with: libkinsol_static,
+  include_directories: kinsol_includes
+)
+
+

build-python/meson.build

@@ -1,7 +1,6 @@
-# --- Python Extension Setup ---
-py_installation = import('python').find_installation('python3', pure: false)
 
 gridfire_py_deps = [
+    py_dep,
     pybind11_dep,
     const_dep,
     config_dep,
@@ -9,9 +8,7 @@ gridfire_py_deps = [
     gridfire_dep
 ]
 
-py_mod = py_installation.extension_module(
+py_sources =  [
-    '_gridfire', # Name of the generated .so/.pyd file (without extension)
-    sources: [
         meson.project_source_root() + '/src/python/bindings.cpp',
         meson.project_source_root() + '/src/python/types/bindings.cpp',
         meson.project_source_root() + '/src/python/partition/bindings.cpp',
@@ -29,11 +26,28 @@ py_mod = py_installation.extension_module(
         meson.project_source_root() + '/src/python/policy/bindings.cpp',
         meson.project_source_root() + '/src/python/policy/trampoline/py_policy.cpp',
         meson.project_source_root() + '/src/python/utils/bindings.cpp',
-    ],
+    ]
+
+
+if meson.is_cross_build() and host_machine.system() == 'darwin'
+  py_mod = shared_module(
+    '_gridfire',
+    sources: py_sources,
+    dependencies: gridfire_py_deps,
+    name_prefix: '',
+    name_suffix: 'so',
+    install: true,
+    install_dir: py_installation.get_install_dir() + '/gridfire'
+    )
+else
+  py_mod = py_installation.extension_module(
+      '_gridfire', # Name of the generated .so/.pyd file (without extension)
+      sources: py_sources,
       dependencies : gridfire_py_deps,
       install : true,
       subdir: 'gridfire',
-)
+  )
+endif
 
 
 py_installation.install_sources(

cross/macos_arm64.ini

@@ -4,13 +4,16 @@ cpp = 'arm64-apple-darwin25-clang++'
 ar = 'arm64-apple-darwin25-ar'
 strip = 'arm64-apple-darwin25-strip'
 pkg-config = 'pkg-config'
+ranlib = '/usr/bin/true'
 
-[host-machine]
+[host_machine]
 system = 'darwin'
 cpu_family = 'aarch64'
-cpi = 'arm64'
+cpu = 'arm64'
 endian = 'little'
 
 [built-in options]
 c_args = ['-mmacosx-version-min=15.0']
 cpp_args = ['-mmacos-version-min=15.0']
+c_link_args = ['-mmacosx-version-min=15.0']
+cpp_link_args = ['-mmacos-version-min=15.0']

meson.build

@@ -30,6 +30,7 @@ message('Found CXX compiler: ' + meson.get_compiler('cpp').get_id())
 message('C++ standard set to: ' + get_option('cpp_std'))
 
 cppc = meson.get_compiler('cpp')
+cc = meson.get_compiler('c')
 
 
 if cppc.get_id() == 'clang'
@@ -72,6 +73,11 @@ if not cppc.has_header('format')
 endif
 
 
+ignore_unused_args = '-Wno-unused-command-line-argument'
+
+add_global_arguments(ignore_unused_args, language: 'cpp')
+add_global_arguments(ignore_unused_args, language: 'c')
+
 
 
 # For Eigen

meson_options.txt

@@ -5,3 +5,4 @@ option('build-tests', type: 'boolean', value: true, description: 'build the test
 option('build-fortran', type: 'boolean', value: false, description: 'build fortran module support')
 option('unsafe-fortran', type: 'boolean', value: false, description: 'Allow untested fortran compilers (compilers other than gfortran)')
 option('unity-safe', type: 'boolean', value: false, description: 'Enable safe unity builds for better compatibility across different compilers and platforms')
+option('python-target-version', type: 'string', value: '3.13', description: 'Target version for python compilation, only used for cross compilation')

src/meson.build

@@ -51,6 +51,7 @@ libgridfire = library('gridfire',
     gridfire_sources,
     include_directories: include_directories('include'),
     dependencies: gridfire_build_dependencies,
+    objects: [cvode_objs, kinsol_objs],
     install : true)
 
 gridfire_dep = declare_dependency(

tests/graphnet_sandbox/main.cpp

@@ -4,7 +4,6 @@
 #include "gridfire/gridfire.h"
 
 #include "fourdst/composition/composition.h"
-#include "fourdst/plugin/bundle/bundle.h"
 #include "fourdst/logging/logging.h"
 #include "fourdst/atomic/species.h"
 #include "fourdst/composition/utils.h"

tests/graphnet_sandbox/meson.build

@@ -1,5 +1,5 @@
 executable(
     'graphnet_sandbox',
     'main.cpp',
-    dependencies: [gridfire_dep, composition_dep, plugin_dep, cli11_dep],
+    dependencies: [gridfire_dep, composition_dep,  cli11_dep],
 )

utils/python/fetch_header_files.sh

@@ -0,0 +1,132 @@
+#!/bin/bash
+
+# --- Configuration ---
+PYTHON_VERSIONS=("3.8.10" "3.9.13" "3.10.11" "3.11.9" "3.12.3" "3.13.0" "3.14.0")
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+BASE_OUTPUT_DIR="$SCRIPT_DIR/../../cross/python_includes"
+
+# --- OS Detection ---
+OS="$(uname -s)"
+echo "Detected OS: $OS"
+
+# --- Dependency Check ---
+check_dependencies() {
+    if [ "$OS" == "Linux" ]; then
+        if ! command -v 7z &> /dev/null; then
+            echo "Error: '7z' (p7zip-full) is required on Linux."
+            exit 1
+        fi
+        if ! command -v cpio &> /dev/null; then
+            echo "Error: 'cpio' is required."
+            exit 1
+        fi
+    fi
+}
+
+# --- Extraction Logic (OS Specific) ---
+extract_pkg() {
+    local pkg_file="$1"
+    local extract_root="$2"
+    local major_ver="$3" # e.g., 3.11
+
+    echo "  -> Extracting..."
+
+    if [ "$OS" == "Darwin" ]; then
+        pkgutil --expand "$pkg_file" "$extract_root/expanded"
+        local payload_path="$extract_root/expanded/Python_Framework.pkg/Payload"
+        
+        if [ ! -f "$payload_path" ]; then
+            echo "  -> Error: Could not find Payload in package."
+            return 1
+        fi
+        mkdir -p "$extract_root/root"
+        pushd "$extract_root/root" > /dev/null
+        cat "$payload_path" | gunzip | cpio -id "*include/python${major_ver}/*" 2>/dev/null
+        popd > /dev/null
+
+    else
+        7z x "$pkg_file" -o"$extract_root/expanded" -y > /dev/null
+        local payload_path="$extract_root/expanded/Python_Framework.pkg/Payload"
+        
+        if [ ! -f "$payload_path" ]; then
+            echo "  -> Error: Could not find Payload in package."
+            return 1
+        fi
+
+        mkdir -p "$extract_root/root"
+        pushd "$extract_root/root" > /dev/null
+        cat "$payload_path" | gunzip | cpio -id "*include/python${major_ver}/*" 2>/dev/null
+        popd > /dev/null
+    fi
+}
+
+check_dependencies
+
+mkdir -p "$BASE_OUTPUT_DIR"
+
+for FULL_VER in "${PYTHON_VERSIONS[@]}"; do
+    MAJOR_VER=$(echo "$FULL_VER" | cut -d. -f1,2)
+    
+    TARGET_DIR="$BASE_OUTPUT_DIR/python-$MAJOR_VER"
+    TEMP_DIR="$BASE_OUTPUT_DIR/tmp_$FULL_VER"
+    PKG_NAME="python-${FULL_VER}-macos11.pkg"
+    
+    if [[ "$MAJOR_VER" == "3.8" ]]; then
+        PKG_NAME="python-${FULL_VER}-macosx10.9.pkg"
+    fi
+
+    DOWNLOAD_URL="https://www.python.org/ftp/python/${FULL_VER}/$PKG_NAME"
+
+    echo "Processing Python $FULL_VER..."
+
+    if [ -d "$TARGET_DIR" ] && [ "$(ls -A $TARGET_DIR)" ]; then
+        echo "  -> Headers already exist in $TARGET_DIR. Skipping."
+        continue
+    fi
+
+    mkdir -p "$TEMP_DIR"
+
+    echo "  -> Downloading from $DOWNLOAD_URL"
+    curl -L -s -o "$TEMP_DIR/python.pkg" "$DOWNLOAD_URL"
+    
+    if [ $? -ne 0 ]; then
+        echo "  -> Download failed! Check version number or internet connection."
+        rm -rf "$TEMP_DIR"
+        continue
+    fi
+
+    # 2. Extract
+    extract_pkg "$TEMP_DIR/python.pkg" "$TEMP_DIR" "$MAJOR_VER"
+
+    # 3. Move Headers to Final Location
+    # The cpio extraction usually results in: ./Versions/X.Y/include/pythonX.Y
+    # We want to move that specific include folder to our target dir
+    
+    FOUND_HEADERS=$(find "$TEMP_DIR/root" -type d -path "*/include/python${MAJOR_VER}" | head -n 1)
+    
+    if [ -n "$FOUND_HEADERS" ]; then
+        echo "  -> Found headers at: $FOUND_HEADERS"
+        
+        # Move the content to the final destination
+        # We want the folder to be .../python-3.11/include/python3.11
+        mkdir -p "$TARGET_DIR/include"
+        mv "$FOUND_HEADERS" "$TARGET_DIR/include/"
+        
+        # Verify pyconfig.h exists (sanity check)
+        if [ -f "$TARGET_DIR/include/python${MAJOR_VER}/pyconfig.h" ]; then
+            echo "  -> Success: Headers installed to $TARGET_DIR"
+        else 
+            echo "  -> Warning: Header move seemed successful, but pyconfig.h is missing."
+        fi
+    else
+        echo "  -> Error: Could not locate header files after extraction."
+    fi
+
+    # 4. Cleanup
+    rm -rf "$TEMP_DIR"
+    echo "---------------------------------------------------"
+done
+
+echo "Done. All headers stored in $BASE_OUTPUT_DIR"
+