add macOS support

README.md

@@ -60,6 +60,9 @@ target:
 * **Linux (Docker):** image `Dockerfile.innowrap-linux` + `build_innowrap_linux.sh`
   → x64 (native), arm64 and riscv64 (cross). Output:
   `prebuilt_linux_innowrap/<arch>/libinnowrap.so`.
+* **macOS:** `build_innowrap_macos.sh` → Universal (arm64 + x64).
+  Requires CMake, Ninja, Boost (`brew install cmake ninja boost`). Output:
+  `prebuilt_macos_innowrap/universal/libinnowrap.dylib`.
 * **Android (Docker):** image `Dockerfile.innowrap-android` (NDK r29 baked in) +
   `build_innowrap_android.sh` → arm64‑v8a, armeabi‑v7a, x86, x86_64. Output:
   `prebuilt_android_innowrap/<abi>/libinnowrap.so`.

native/build_innowrap_macos.sh

@@ -0,0 +1,96 @@
+#!/bin/sh
+# Builds libinnowrap.dylib for macOS: Apple Silicon + x86_64.
+#
+# innowrap is a parser-only wrapper around innoextract. It links NO compression
+# library, so cross-compiling needs nothing special beyond the C++ toolchain and
+# the (header-only) Boost headers (libboost-dev).
+#
+# The innoextract source is cloned fresh on every run; INNOEXTRACT_REF pins the ref.
+#
+# Outputs:
+#   prebuilt_macos_innowrap/universal/libinnowrap.dylib
+
+SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+
+# The CMake project (CMakeLists.txt + wrapper/) lives next to this script.
+INNOWRAP_SRC="$SCRIPT_DIR"
+INNO_FORK="${INNO_FORK:-https://github.com/dscharrer/innoextract.git}"
+INNO_REF="${INNO_REF:-6e9e34ed0876014fdb46e684103ef8c3605e382e}"
+BOOST_INCLUDEDIR="${BOOST_INCLUDEDIR:-"$(brew --prefix boost)/include"}"
+TARGET_PREBUILT_FOLDER="$SCRIPT_DIR/prebuilt_macos_innowrap"
+# Build OFF the (possibly bind-mounted) script dir. Windows Docker bind mounts
+# report file mtimes that make ninja think build.ninja is perpetually dirty
+# ("manifest still dirty ... perhaps system time is not set"). A container-local
+# temp dir has sane timestamps; only the final .so is copied to the output folder.
+TEMP_FOLDER="${INNOWRAP_BUILD_TMP:-/tmp/innowrap_build_macos}"
+
+if [ ! -f "$INNOWRAP_SRC/CMakeLists.txt" ] || [ ! -d "$INNOWRAP_SRC/wrapper" ]; then
+    echo "Error: expected the innowrap project at $INNOWRAP_SRC (CMakeLists.txt + wrapper/)." >&2
+    exit 1
+fi
+
+rm -rf "$TARGET_PREBUILT_FOLDER" "$TEMP_FOLDER"
+mkdir -p "$TARGET_PREBUILT_FOLDER" "$TEMP_FOLDER"
+
+#############################################################################
+# --- Get innoextract source (pinned) ---------------------------------------
+#############################################################################
+INNO_DIR="$TEMP_FOLDER/innoextract"
+echo "Cloning innoextract (ref: $INNO_REF) ..."
+git clone "$INNO_FORK" "$INNO_DIR" || { echo "git clone failed" >&2; exit 1; }
+git -C "$INNO_DIR" checkout "$INNO_REF" || { echo "git checkout $INNO_REF failed" >&2; exit 1; }
+
+# Copy the project (CMakeLists.txt + wrapper/) off the mount too, so NO configure
+# input lives on the bind mount (cp gives the copies fresh, container-local mtimes).
+PROJ_LOCAL="$TEMP_FOLDER/innowrap_src"
+mkdir -p "$PROJ_LOCAL"
+cp "$INNOWRAP_SRC/CMakeLists.txt" "$PROJ_LOCAL/"
+cp -r "$INNOWRAP_SRC/wrapper" "$PROJ_LOCAL/"
+
+#############################################################################
+# Build helper: configures+builds libinnowrap for one (arch, toolchain).
+#   $1 = label (x64 / arm64 / riscv64)
+#   $2 = CMAKE_SYSTEM_PROCESSOR (empty = native)
+#   $3 = CC  (empty = native)
+#   $4 = CXX (empty = native)
+#############################################################################
+build() {
+    label="universal"
+    build_dir="$TEMP_FOLDER/build-$label"
+
+    echo ""
+    echo "=== Building libinnowrap for macOS ==="
+
+    # shellcheck disable=SC2086
+    cmake -S "$PROJ_LOCAL" -B "$build_dir" -G Ninja \
+        -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" \
+        -DCMAKE_OSX_DEPLOYMENT_TARGET="11.0" \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DINNOEXTRACT_SRC="$INNO_DIR/src" \
+        -DBOOST_INCLUDEDIR="$BOOST_INCLUDEDIR"
+    cmake --build "$build_dir" -j"$(nproc)"
+
+    out_dir="$TARGET_PREBUILT_FOLDER/$label"
+    mkdir -p "$out_dir"
+    cp "$build_dir"/libinnowrap.dylib "$out_dir"/ 2>/dev/null
+
+    if [ ! -f "$out_dir/libinnowrap.dylib" ]; then
+        echo "Error: libinnowrap.dylib was not produced for $label" >&2
+        exit 1
+    fi
+
+    codesign --force --timestamp --deep --sign - "$out_dir/libinnowrap.dylib" 2>/dev/null
+
+    echo "-> $out_dir/libinnowrap.dylib"
+}
+
+build
+
+#############################################################################
+# Cleanup (keep the per-arch .so folders)
+#############################################################################
+rm -rf "$TEMP_FOLDER"
+
+echo ""
+echo "Done. Output in $TARGET_PREBUILT_FOLDER:"
+find "$TARGET_PREBUILT_FOLDER" -name '*.dylib'