Debian trixie-based build-compile-deploy workflow

scripts/build.sh

@@ -11,16 +11,62 @@ UI_DIR="$PROJECT_ROOT/pi/ui"
 echo "=== Smart Serow Build ==="
 echo "Project: $UI_DIR"
 
+# Check for flutter-elinux
+if ! command -v flutter-elinux &> /dev/null; then
+    echo "ERROR: flutter-elinux not found in PATH"
+    echo "Install it or check your PATH"
+    echo ""
+    echo "Current PATH: $PATH"
+    which flutter 2>/dev/null && echo "Found flutter at: $(which flutter)"
+    exit 1
+fi
+
+echo "Using: $(which flutter-elinux)"
+
+# Cross-compilation toolchain for ARM64
+export CC=aarch64-linux-gnu-gcc
+export CXX=aarch64-linux-gnu-g++
+export AR=aarch64-linux-gnu-ar
+export LD=aarch64-linux-gnu-ld
+# CMake-specific vars
+export CMAKE_C_COMPILER=aarch64-linux-gnu-gcc
+export CMAKE_CXX_COMPILER=aarch64-linux-gnu-g++
+
+echo "Cross-compiler: $CXX"
+
 cd "$UI_DIR"
 
-# Clean previous build (optional, comment out for faster incremental builds)
-# flutter-elinux clean
+# Initialize elinux project if not already configured
+if [ ! -d "elinux" ]; then
+    echo "Initializing elinux project structure..."
+    flutter-elinux create . --project-name smartserow_ui --org com.smartserow
+fi
+
+# Clean CMake cache on --clean flag
+# (CMake caches compiler choice, so stale cache = wrong linker)
+if [ "${1:-}" = "--clean" ]; then
+    echo "Cleaning CMake cache..."
+    rm -rf build/elinux/arm64
+fi
 
 echo "Fetching dependencies..."
 flutter-elinux pub get
 
-echo "Building for ARM64 (elinux)..."
-flutter-elinux build elinux --target-arch=arm64 --release
+echo "Building for ARM64 (elinux) with DRM-GBM backend..."
+
+# Use Pi sysroot if available (for proper cross-linking)
+SYSROOT_FLAG=""
+if [ -d "$PROJECT_ROOT/pi_sysroot" ]; then
+    echo "Using Pi sysroot: $PROJECT_ROOT/pi_sysroot"
+    SYSROOT_FLAG="--target-sysroot=$PROJECT_ROOT/pi_sysroot"
+fi
+
+flutter-elinux build elinux \
+    --target-arch=arm64 \
+    --target-backend-type=gbm \
+    --target-compiler-triple=aarch64-linux-gnu \
+    $SYSROOT_FLAG \
+    --release
 
 BUILD_OUTPUT="$UI_DIR/build/elinux/arm64/release/bundle"