feat: add export symbol name test to CI for embedded targets

- Created _demo/embed/export/ with test for //export directive
- Test verifies symbols are exported with correct names (LPSPI2_IRQHandler, SysTick_Handler)
- Added CI workflow step to run the test
- Essential for embedded development where hardware requires specific symbol names

🤖 Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: luoliwoshang <51194195+luoliwoshang@users.noreply.github.com>

.github/workflows/llgo.yml

@@ -133,6 +133,13 @@ jobs:
           chmod +x test.sh
           ./test.sh
 
+      - name: Test export symbol names for embedded targets
+        run: |
+          echo "Testing //export with different symbol names for embedded development..."
+          cd _demo/embed/export
+          chmod +x test.sh
+          ./test.sh
+
       - name: _xtool build tests
         run: |
           cd _xtool

_demo/embed/export/main.go

@@ -0,0 +1,22 @@
+package main
+
+//export LPSPI2_IRQHandler
+func interruptLPSPI2() {
+	println("LPSPI2 interrupt handled")
+}
+
+//export SysTick_Handler
+func systemTickHandler() {
+	println("System tick")
+}
+
+//export Add
+func Add(a, b int) int {
+	return a + b
+}
+
+func main() {
+	interruptLPSPI2()
+	systemTickHandler()
+	println("Add(2, 3) =", Add(2, 3))
+}

_demo/embed/export/test.sh

@@ -0,0 +1,118 @@
+#!/bin/bash
+
+# Test script for //export with different symbol names
+# This is essential for embedded development where hardware specifications require
+# specific symbol names (e.g., ARM Cortex-M interrupt handlers).
+
+set -e  # Exit on any error
+
+# Get script directory
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR"
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Function to print colored output
+print_status() {
+    echo -e "${GREEN}[INFO]${NC} $1"
+}
+
+print_error() {
+    echo -e "${RED}[ERROR]${NC} $1"
+}
+
+# Check if llgo command is available
+if ! command -v llgo &> /dev/null; then
+    print_error "llgo command not found, please install llgo first"
+    exit 1
+fi
+
+# Check if LLGO_ROOT is set
+if [[ -z "$LLGO_ROOT" ]]; then
+    print_error "LLGO_ROOT environment variable is not set"
+    exit 1
+fi
+
+print_status "Starting export symbol name test..."
+print_status "Working directory: $SCRIPT_DIR"
+print_status "LLGO_ROOT: $LLGO_ROOT"
+
+echo ""
+
+# Build the test program
+print_status "=== Building test program ==="
+if llgo build -o test_export main.go; then
+    print_status "Build succeeded"
+else
+    print_error "Build failed"
+    exit 1
+fi
+
+# Check for expected symbols using nm
+print_status "=== Checking exported symbols with nm ==="
+if ! command -v nm &> /dev/null; then
+    print_error "nm command not found, skipping symbol verification"
+    exit 1
+fi
+
+NM_OUTPUT=$(nm test_export)
+
+# Verify LPSPI2_IRQHandler symbol exists (not interruptLPSPI2)
+if echo "$NM_OUTPUT" | grep -q "LPSPI2_IRQHandler"; then
+    print_status "✓ Symbol LPSPI2_IRQHandler found"
+else
+    print_error "✗ Symbol LPSPI2_IRQHandler not found"
+    echo "Available symbols:"
+    echo "$NM_OUTPUT"
+    exit 1
+fi
+
+# Verify SysTick_Handler symbol exists (not systemTickHandler)
+if echo "$NM_OUTPUT" | grep -q "SysTick_Handler"; then
+    print_status "✓ Symbol SysTick_Handler found"
+else
+    print_error "✗ Symbol SysTick_Handler not found"
+    echo "Available symbols:"
+    echo "$NM_OUTPUT"
+    exit 1
+fi
+
+# Verify Add symbol exists (same name)
+if echo "$NM_OUTPUT" | grep -q "Add"; then
+    print_status "✓ Symbol Add found"
+else
+    print_error "✗ Symbol Add not found"
+    echo "Available symbols:"
+    echo "$NM_OUTPUT"
+    exit 1
+fi
+
+# Verify that the original function names are NOT exported as main symbols
+# (they should only appear as internal symbols, not as exported text symbols 'T')
+EXPORTED_SYMBOLS=$(echo "$NM_OUTPUT" | grep " T " || true)
+
+if echo "$EXPORTED_SYMBOLS" | grep -q "interruptLPSPI2"; then
+    print_error "✗ Unexpected exported symbol: interruptLPSPI2 (should be LPSPI2_IRQHandler)"
+    exit 1
+else
+    print_status "✓ interruptLPSPI2 not exported as main symbol"
+fi
+
+if echo "$EXPORTED_SYMBOLS" | grep -q "systemTickHandler"; then
+    print_error "✗ Unexpected exported symbol: systemTickHandler (should be SysTick_Handler)"
+    exit 1
+else
+    print_status "✓ systemTickHandler not exported as main symbol"
+fi
+
+echo ""
+print_status "=== All symbol name tests passed! ==="
+
+# Cleanup
+rm -f test_export
+
+print_status "Export symbol name test completed successfully!"