Add Xcode pre-build script for Gemstone XCFramework

ios/Gem.xcodeproj/project.pbxproj

@@ -795,6 +795,7 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = C30952D5299C39D80004C0F9 /* Build configuration list for PBXNativeTarget "Gem" */;
 			buildPhases = (
+				D8GEMST0NE2025040800001 /* Build Gemstone */,
 				C30952AC299C39D70004C0F9 /* Sources */,
 				C30952AD299C39D70004C0F9 /* Frameworks */,
 				C30952AE299C39D70004C0F9 /* Resources */,
@@ -1122,6 +1123,24 @@
 		};
 /* End PBXResourcesBuildPhase section */
 
+/* Begin PBXShellScriptBuildPhase section */
+		D8GEMST0NE2025040800001 /* Build Gemstone */ = {
+			isa = PBXShellScriptBuildPhase;
+			alwaysOutOfDate = 1;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			name = "Build Gemstone";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/bash;
+			shellScript = "\"$SRCROOT/scripts/generate-stone.sh\"\n";
+		};
+/* End PBXShellScriptBuildPhase section */
+
 /* Begin PBXSourcesBuildPhase section */
 		C30952AC299C39D70004C0F9 /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
@@ -1372,7 +1391,7 @@
 				EAGER_LINKING = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
-				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -1451,7 +1470,7 @@
 				EAGER_LINKING = YES;
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;

ios/justfile

@@ -169,10 +169,8 @@ generate-swiftgen:
     @echo "==> SwiftGen assets and Localizable.strings"
     @swiftgen config run --quiet
 
-export BUILD_MODE := env_var_or_default("BUILD_MODE","")
-
-generate-stone:
-    @./scripts/generate-stone.sh $BUILD_MODE
+generate-stone BUILD_MODE="":
+    @./scripts/generate-stone.sh {{BUILD_MODE}}
 
 bump TARGET="patch":
     @cd .. && just bump {{TARGET}}

ios/scripts/generate-stone.sh

@@ -1,30 +1,60 @@
 #!/usr/bin/env bash
+#
+# Build the Gemstone XCFramework, skipping when Rust sources are unchanged.
+# Usage: generate-stone.sh [release]
 
-set -e
+set -euo pipefail
 
-CURRENT_DIR=$(dirname `realpath $0`)
-PROJ_PATH=${CURRENT_DIR}/../Gem.xcodeproj/project.pbxproj
-STONE_DIR=${CURRENT_DIR}/../../core/gemstone
-PACKAGES_DIR=${CURRENT_DIR}/../Packages/Gemstone
-BUILD_MODE=$1
+export PATH="$HOME/.cargo/bin:/opt/homebrew/bin:/usr/local/bin:$PATH"
+
+CURRENT_DIR=$(dirname "$(realpath "$0")")
+IOS_DIR="$CURRENT_DIR/.."
+PROJ_PATH="$IOS_DIR/Gem.xcodeproj/project.pbxproj"
+CORE_DIR="$IOS_DIR/../core"
+STONE_DIR="$CORE_DIR/gemstone"
+PACKAGES_DIR="$IOS_DIR/Packages/Gemstone"
+XCFRAMEWORK="$PACKAGES_DIR/Sources/GemstoneFFI.xcframework"
+
+BUILD_MODE="${1:-${BUILD_MODE:-}}"
+if [ -z "$BUILD_MODE" ] && [ "${CONFIGURATION:-Debug}" = "Release" ]; then
+    BUILD_MODE="release"
+fi
+
+compute_hash() {
+    {
+        git -C "$CORE_DIR" rev-parse HEAD
+        git -C "$CORE_DIR" diff
+        git -C "$CORE_DIR" ls-files --others --exclude-standard -z | \
+            (cd "$CORE_DIR" && xargs -0 stat -f '%m %z %N' 2>/dev/null)
+    } | shasum -a 256 | cut -d' ' -f1
+}
+
+CACHE_DIR="$IOS_DIR/build/.gemstone-cache"
+mkdir -p "$CACHE_DIR"
+HASH_FILE="$CACHE_DIR/sources-${BUILD_MODE:-debug}.hash"
+
+current_hash=$(compute_hash)
+
+if [ -f "$HASH_FILE" ] && [ -d "$XCFRAMEWORK" ]; then
+    cached_hash=$(cat "$HASH_FILE")
+    if [ "$current_hash" = "$cached_hash" ]; then
+        echo "note: Gemstone sources unchanged (${BUILD_MODE:-debug}) — skipping rebuild"
+        exit 0
+    fi
+fi
 
 read_deployment_target() {
     echo -n $(/usr/libexec/PlistBuddy -c "Print" "$PROJ_PATH" | grep IPHONEOS_DEPLOYMENT_TARGET | awk -F ' = ' '{print $2}' | uniq)
 }
 
-generate() {
-    if [ -z $BUILD_MODE ]; then
-        echo "Build Gemstone debug"
-    else
-        echo "Build Gemstone $BUILD_MODE"
-    fi
+echo "note: Gemstone sources changed — rebuilding XCFramework (${BUILD_MODE:-debug})..."
 
-    pushd ${STONE_DIR} > /dev/null
-    BUILD_MODE=$BUILD_MODE IPHONEOS_DEPLOYMENT_TARGET=$(read_deployment_target) just build-ios
-    rm -rf ${PACKAGES_DIR}
-    cp -Rf target/spm ${PACKAGES_DIR}
+pushd "$STONE_DIR" > /dev/null
+BUILD_MODE=$BUILD_MODE IPHONEOS_DEPLOYMENT_TARGET=$(read_deployment_target) just build-ios
+rm -rf "$PACKAGES_DIR"
+cp -Rf target/spm "$PACKAGES_DIR"
+popd > /dev/null
 
-    popd > /dev/null
-}
+echo "$current_hash" > "$HASH_FILE"
 
-generate
+echo "note: Gemstone XCFramework rebuilt successfully (${BUILD_MODE:-debug})"