fix(darwin): framework-ize ctypes .dylib libs so they load on the iOS simulator

src/serious_python_darwin/darwin/sync_site_packages.sh

@@ -33,16 +33,26 @@ if [[ -n "$SERIOUS_PYTHON_SITE_PACKAGES" && -d "$SERIOUS_PYTHON_SITE_PACKAGES" ]
         cp -R $SERIOUS_PYTHON_SITE_PACKAGES/* $tmp_dir
 
         echo "Converting dylibs to xcframeworks..."
-        find "$tmp_dir/${archs[0]}" -name "*.$dylib_ext" | while read full_dylib; do
+        # Process BOTH .so (Python C-extensions) and .dylib (ctypes-loaded shared
+        # libs, e.g. llama-cpp-python's libllama/libggml*). Previously only *.so
+        # was framework-ized; *.dylib fell through and shipped the archs[0]=iphoneos
+        # DEVICE build, so it failed to dlopen on the simulator.
+        for _sp_ext in so dylib; do
+        # -type f: skip SONAME symlinks (e.g. libfoo.dylib -> libfoo.1.dylib);
+        # only real Mach-O files are converted. Recipes should ship unversioned
+        # shared libs (as the flet-lib* recipes already do).
+        find "$tmp_dir/${archs[0]}" -name "*.$_sp_ext" -type f | while read full_dylib; do
             dylib_relative_path=${full_dylib#$tmp_dir/${archs[0]}/}
             create_xcframework_from_dylibs \
                 "$tmp_dir/${archs[0]}" \
                 "$tmp_dir/${archs[1]}" \
                 "$tmp_dir/${archs[2]}" \
                 $dylib_relative_path \
+                "$_sp_ext" \
                 "Frameworks/serious_python_darwin.framework/python.bundle/site-packages" \
                 $dist/site-xcframeworks
         done
+        done
 
         rm -rf $dist/site-packages
         mkdir -p $dist/site-packages

src/serious_python_darwin/darwin/xcframework_utils.sh

@@ -45,8 +45,9 @@ create_xcframework_from_dylibs() {
     simulator_arm64_dir=$2
     simulator_x86_64_dir=$3
     dylib_relative_path=$4
-    origin_prefix=$5
-    out_dir=$6
+    ext=${5:-$dylib_ext}
+    origin_prefix=$6
+    out_dir=$7
 
     dylib_tmp_dir=$(mktemp -d)
     pushd -- "${dylib_tmp_dir}" >/dev/null
@@ -60,25 +61,37 @@ create_xcframework_from_dylibs() {
     done
     framework_identifier=${framework_identifier:-framework}
 
+    # If neither simulator slice has this lib, leave the file untouched rather
+    # than fail `lipo` on an empty input (e.g. a device-only artifact). It then
+    # ships as-is in the flat base, exactly as before this conversion existed.
+    if [ -z "$(find "$simulator_arm64_dir" "$simulator_x86_64_dir" \
+                    \( -path "*/$dylib_without_ext.*.$ext" -o -path "*/$dylib_without_ext.$ext" \) \
+                    -type f 2>/dev/null | head -1)" ]; then
+        echo "  no simulator slice for $dylib_relative_path; leaving as-is"
+        popd >/dev/null
+        rm -rf "${dylib_tmp_dir}" >/dev/null
+        return
+    fi
+
     # creating "iphoneos" framework
     fd=iphoneos/$framework.framework
     mkdir -p $fd
     mv "$iphone_dir/$dylib_relative_path" $fd/$framework
     echo "Frameworks/$framework.framework/$framework" > "$iphone_dir/$dylib_without_ext.fwork"
-    install_name_tool -id @rpath/$framework.framework/$framework $fd/$framework
+    if [ "$ext" = "so" ]; then install_name_tool -id @rpath/$framework.framework/$framework $fd/$framework; fi
     create_plist $framework "org.python.$framework_identifier" $fd/Info.plist
     echo "$origin_prefix/$dylib_without_ext.fwork" > $fd/$framework.origin
 
     # creating "iphonesimulator" framework
     fd=iphonesimulator/$framework.framework
     mkdir -p $fd
     lipo -create \
-        $(find "$simulator_arm64_dir" -path "$simulator_arm64_dir/$dylib_without_ext.*.$dylib_ext" -o -path "$simulator_arm64_dir/$dylib_without_ext.$dylib_ext") \
-        $(find "$simulator_x86_64_dir" -path "$simulator_x86_64_dir/$dylib_without_ext.*.$dylib_ext" -o -path "$simulator_x86_64_dir/$dylib_without_ext.$dylib_ext") \
+        $(find "$simulator_arm64_dir" -path "$simulator_arm64_dir/$dylib_without_ext.*.$ext" -o -path "$simulator_arm64_dir/$dylib_without_ext.$ext") \
+        $(find "$simulator_x86_64_dir" -path "$simulator_x86_64_dir/$dylib_without_ext.*.$ext" -o -path "$simulator_x86_64_dir/$dylib_without_ext.$ext") \
         -output $fd/$framework
-    find "$simulator_arm64_dir" -path "$simulator_arm64_dir/$dylib_without_ext.*.$dylib_ext" -o -path "$simulator_arm64_dir/$dylib_without_ext.$dylib_ext" -delete
-    find "$simulator_x86_64_dir" -path "$simulator_x86_64_dir/$dylib_without_ext.*.$dylib_ext" -o -path "$simulator_x86_64_dir/$dylib_without_ext.$dylib_ext" -delete
-    install_name_tool -id @rpath/$framework.framework/$framework $fd/$framework
+    find "$simulator_arm64_dir" -path "$simulator_arm64_dir/$dylib_without_ext.*.$ext" -o -path "$simulator_arm64_dir/$dylib_without_ext.$ext" -delete
+    find "$simulator_x86_64_dir" -path "$simulator_x86_64_dir/$dylib_without_ext.*.$ext" -o -path "$simulator_x86_64_dir/$dylib_without_ext.$ext" -delete
+    if [ "$ext" = "so" ]; then install_name_tool -id @rpath/$framework.framework/$framework $fd/$framework; fi
     create_plist $framework "org.python.$framework_identifier" $fd/Info.plist
     echo "$origin_prefix/$dylib_without_ext.fwork" > $fd/$framework.origin