fix(python-bindings): added darwin duplicate rpath patch and fixed python rpath poiting

due to a current bug in meson-python duplicate rpaths are registered in the shared object files created by meson-python. The new masos dynamic loader refuses to load shared object files with duplicate rpaths. There is a small patch script which removes any duplicates. This is a temporary but effective fix (https://github.com/mesonbuild/meson-python/issues/813). Further, there was an issue due to mixed use of pure python and C++ code with name conflicts. This has been resolved so that both python and C++ code can be imported just find now.

pip_install_mac_patch.sh

@@ -0,0 +1,111 @@
+#!/bin/bash
+# pip_install_mac.sh - Temporary workaround for meson-python duplicate RPATH bug on macOS
+
+set -e
+
+# Color codes for output
+RED='\033[0;31m'
+YELLOW='\033[1;33m'
+GREEN='\033[0;32m'
+NC='\033[0m' # No Color
+
+echo -e "${YELLOW}"
+echo "========================================================================="
+echo "                    TEMPORARY INSTALLATION WORKAROUND"
+echo "========================================================================="
+echo -e "${NC}"
+echo ""
+echo -e "${YELLOW}WARNING:${NC} This script applies a temporary patch to fix a known issue with"
+echo "meson-python that causes duplicate RPATH entries in built Python extensions"
+echo "on macOS, preventing module imports."
+echo ""
+echo "This workaround will:"
+echo "  1. Install fourdst using pip"
+echo "  2. Locate the installed extension module"
+echo "  3. Remove duplicate RPATH entries using install_name_tool"
+echo ""
+echo "This is a temporary solution while the meson-python team resolves the"
+echo "duplicate RPATH bug. For more information, see:"
+echo "  https://github.com/mesonbuild/meson-python/issues/813"
+echo ""
+echo -e "${YELLOW}Do you understand and wish to continue? [y/N]${NC} "
+read -r response
+
+if [[ ! "$response" =~ ^[Yy]$ ]]; then
+    echo -e "${RED}Installation cancelled.${NC}"
+    exit 1
+fi
+
+echo ""
+echo -e "${GREEN}Step 1: Finding current Python environment...${NC}"
+
+# Get the current Python executable
+PYTHON_BIN=$(which python3)
+if [ -z "$PYTHON_BIN" ]; then
+    echo -e "${RED}Error: python3 not found in PATH${NC}"
+    exit 1
+fi
+
+echo "Using Python: $PYTHON_BIN"
+PYTHON_VERSION=$($PYTHON_BIN --version)
+echo "Python version: $PYTHON_VERSION"
+
+# Get site-packages directory
+SITE_PACKAGES=$($PYTHON_BIN -c "import site; print(site.getsitepackages()[0])")
+echo "Site packages: $SITE_PACKAGES"
+echo ""
+
+echo -e "${GREEN}Step 2: Installing fourdst with pip...${NC}"
+$PYTHON_BIN -m pip install . -v
+
+if [ $? -ne 0 ]; then
+    echo -e "${RED}Error: pip install failed${NC}"
+    exit 1
+fi
+echo ""
+
+echo -e "${GREEN}Step 3: Locating installed extension module...${NC}"
+
+# Find the .so file
+SO_FILE=$(find "$SITE_PACKAGES/fourdst" -name "_phys.cpython-*-darwin.so" 2>/dev/null | head -n 1)
+
+if [ -z "$SO_FILE" ]; then
+    echo -e "${RED}Error: Could not find _phys.cpython-*-darwin.so in $SITE_PACKAGES/fourdst${NC}"
+    echo "Installation may have failed or the file is in an unexpected location."
+    exit 1
+fi
+
+echo "Found extension module: $SO_FILE"
+echo ""
+
+echo -e "${GREEN}Step 4: Running RPATH fix script...${NC}"
+
+# Check if fix_rpath.py exists
+FIX_SCRIPT="build-python/fix_rpaths.py"
+if [ ! -f "$FIX_SCRIPT" ]; then
+    echo -e "${RED}Error: $FIX_SCRIPT not found${NC}"
+    echo "Please ensure you're running this script from the project root directory."
+    exit 1
+fi
+
+# Run the fix script
+$PYTHON_BIN "$FIX_SCRIPT" "$SO_FILE"
+
+if [ $? -ne 0 ]; then
+    echo -e "${RED}Error: RPATH fix script failed${NC}"
+    exit 1
+fi
+
+echo ""
+echo -e "${GREEN}=========================================================================${NC}"
+echo -e "${GREEN}                    Installation Complete!${NC}"
+echo -e "${GREEN}=========================================================================${NC}"
+echo ""
+echo "You can now use fourdst in your Python environment."
+echo ""
+echo "Test the installation with:"
+echo "  $PYTHON_BIN -c 'import fourdst; print(fourdst.__version__)'"
+echo ""
+echo -e "${YELLOW}Note:${NC} If you reinstall or upgrade fourdst, you will need to run this"
+echo "script again to apply the RPATH fix."
+echo ""