feat(build): 添加交叉编译目标平台支持

- 在 Clang 和 GCC 编译器后端中添加 --target 参数支持
- 添加 target-platform 配置选项的常量定义
- 在命令行参数解析中添加对 target-platform 的支持
- 将 target-platform 配置传递给编译器命令生成逻辑
- 更新帮助文档显示新的交叉编译选项
- 支持指定交叉编译目标三元组 (如 aarch64-linux-gnu)

src/Php/Backend/Clang.php

@@ -408,6 +408,11 @@ class Clang extends CompilerBackend
             $cmd .= ' -march=' . $config['march'];
         }
         
+        // 交叉编译目标平台 (--target=<triple>)
+        if (!empty($config['target_platform'])) {
+            $cmd .= ' --target=' . $config['target_platform'];
+        }
+        
         // PIC (Position Independent Code)
         if ((!empty($config['build_mode']) && $config['build_mode'] === 'ext') || !empty($config['pic'])) {
             if ($this->platform instanceof \PhpAot\Php\Platform\Windows) {
@@ -495,6 +500,11 @@ class Clang extends CompilerBackend
             $cmd .= ' -fsanitize=' . $config['sanitize'];
         }
 
+        // 交叉编译目标平台 (--target=<triple>)
+        if (!empty($config['target_platform'])) {
+            $cmd .= ' --target=' . $config['target_platform'];
+        }
+
         // LTO（链接时优化）
         if (!empty($config['lto'])) {
             $cmd .= ' -flto';

src/Php/Backend/Gcc.php

@@ -294,6 +294,11 @@ class Gcc extends CompilerBackend
             $cmd .= ' -march=' . $config['march'];
         }
         
+        // 交叉编译目标平台 (--target=<triple>)
+        if (!empty($config['target_platform'])) {
+            $cmd .= ' --target=' . $config['target_platform'];
+        }
+        
         // PIC (Position Independent Code)
         if ((!empty($config['build_mode']) && $config['build_mode'] === 'ext') || !empty($config['pic'])) {
             $cmd .= ' -fPIC';
@@ -359,6 +364,11 @@ class Gcc extends CompilerBackend
             }
         }
 
+        // 交叉编译目标平台 (--target=<triple>)
+        if (!empty($config['target_platform'])) {
+            $cmd .= ' --target=' . $config['target_platform'];
+        }
+
         // LTO（链接时优化）
         if (!empty($config['lto'])) {
             $cmd .= ' -flto';

src/Php/Constants.php

@@ -169,6 +169,12 @@ class Constants
             'required'    => false,
             'defaultValue' => '',
         ],
+        'target-platform' => [
+            'longPrefix'  => 'target-platform',
+            'description' => 'Cross-compilation target triple (e.g. aarch64-linux-gnu, x86_64-w64-mingw32)',
+            'required'    => false,
+            'defaultValue' => '',
+        ],
         'no-color' => [
             'longPrefix'  => 'no-color',
             'description' => 'Disable ANSI color output',

src/Php/Translator.php

@@ -232,6 +232,7 @@ class Translator extends Preprocessor
         $climate->tab()->out('-j, --job <num>      Number of parallel compilation jobs (default: 4)');
         $climate->tab()->out('--cxx-std <ver>      C++ standard version (c++17, c++20, etc., default: c++17)');
         $climate->tab()->out('--march <arch>       Target CPU instruction set (e.g. native, x86-64-v3, armv8-a)');
+        $climate->tab()->out('--target-platform <triple> Cross-compilation target triple (e.g. aarch64-linux-gnu)');
         $climate->tab()->out('--lto                Enable Link Time Optimization (-flto)');
         $climate->tab()->out('--no-literal-strings Disable literal strings optimization');
         $climate->tab()->out('--no-console         Hide console window (Windows only, GUI application)');
@@ -311,6 +312,11 @@ class Translator extends Preprocessor
             $this->march = $this->climate->arguments->get('march');
         }
 
+        // 交叉编译目标平台
+        if ($this->climate->arguments->defined('target-platform')) {
+            $this->targetPlatform = $this->climate->arguments->get('target-platform');
+        }
+
         // 构建目录
         if ($this->climate->arguments->defined('build-dir')) {
             $buildDir = $this->climate->arguments->get('build-dir');
@@ -1403,6 +1409,7 @@ CODE;
             'sanitize' => $this->sanitize,
             'cpp_std' => $this->cxxStd,
             'march' => $this->march,
+            'target_platform' => $this->targetPlatform,
             'is_zts' => $this->isPhpZts,
             'build_mode' => $this->buildMode,
             'enable_profiler' => $this->enableProfiler,
@@ -1442,6 +1449,7 @@ CODE;
             'enable_profiler' => $this->enableProfiler,
             'suppressed_warnings' => Constants::MSVC_SUPPRESSED_WARNINGS ?? [],
             'march' => $this->march,
+            'target_platform' => $this->targetPlatform,
         ];
     }
 
@@ -1472,6 +1480,7 @@ CODE;
             'build_mode' => $this->buildMode,
             'sanitize' => $this->sanitize,
             'lto' => $this->enableLto,
+            'target_platform' => $this->targetPlatform,
         ];
 
         $rpaths = $this->getPlatform()->getDefaultRpaths(