examination/topics/networking/go-build-strip/single_choice.json

{
  "topic": "go-build-strip",
  "type": "single_choice",
  "schema_version": "1.0.0",
  "generated": "2026-09-02T21:20:00+08:00",
  "questions": [
    {
      "id": "sc-001",
      "type": "single_choice",
      "difficulty": 2,
      "tags": [
        "Go",
        "编译",
        "-s"
      ],
      "question": "Go 编译标志 -s 的作用是什么？",
      "options": {
        "A": "启用安全模式",
        "B": "剥离符号表（函数名、变量名等调试符号）",
        "C": "启用静态编译",
        "D": "开启优化"
      },
      "answer": "B",
      "explanation": "-s 标志剥离符号表（函数名、变量名等调试符号），-w 标志剥离 DWARF 调试信息。-s -w 组合体积最小化，最适合发布部署。",
      "source": null,
      "related": []
    },
    {
      "id": "sc-002",
      "type": "single_choice",
      "difficulty": 3,
      "tags": [
        "Go",
        "编译",
        "-w"
      ],
      "question": "Go 编译标志 -w 的作用是什么？",
      "options": {
        "A": "剥离符号表",
        "B": "剥离 DWARF 调试信息（gdb/lldb 所需的详细信息）",
        "C": "启用警告",
        "D": "开启 Web 支持"
      },
      "answer": "B",
      "explanation": "-w 标志剥离 DWARF 调试信息，这是 gdb/lldb 等调试器所需的详细信息。剥离后无法用 gdb 调试。",
      "source": null,
      "related": []
    },
    {
      "id": "sc-003",
      "type": "single_choice",
      "difficulty": 3,
      "tags": [
        "Go",
        "编译",
        "体积"
      ],
      "question": "使用 -s 标志编译后，二进制体积大约能减少多少？",
      "options": {
        "A": "5-10%",
        "B": "20-30%",
        "C": "50-60%",
        "D": "70-80%"
      },
      "answer": "B",
      "explanation": "使用 -s 标志剥离符号表后，二进制体积大约能减少 20-30%。实际节省取决于程序复杂度。",
      "source": null,
      "related": []
    },
    {
      "id": "sc-004",
      "type": "single_choice",
      "difficulty": 4,
      "tags": [
        "Go",
        "编译",
        "panic"
      ],
      "question": "使用 -s 标志后，panic 堆栈输出会有什么变化？",
      "options": {
        "A": "完全看不到函数名",
        "B": "函数名还在，但完整源码路径丢失",
        "C": "没有变化",
        "D": "只显示地址"
      },
      "answer": "B",
      "explanation": "使用 -s 剥离符号表后，函数名还在，但完整源码路径丢失。例如从 /home/user/app/main.go:42 变成 main.go:42。",
      "source": null,
      "related": []
    },
    {
      "id": "sc-005",
      "type": "single_choice",
      "difficulty": 3,
      "tags": [
        "Go",
        "编译",
        "pprof"
      ],
      "question": "剥离符号表后，go tool pprof 会显示什么？",
      "options": {
        "A": "完整的函数名",
        "B": "只有地址（如 0x4a3b20）",
        "C": "错误信息",
        "D": "没有变化"
      },
      "answer": "B",
      "explanation": "剥离符号表后 pprof 只显示地址（如 0x4a3b20），无法定位到具体函数。线上排查性能问题时非常痛苦。",
      "source": null,
      "related": []
    },
    {
      "id": "sc-006",
      "type": "single_choice",
      "difficulty": 2,
      "tags": [
        "Go",
        "编译",
        "生产环境"
      ],
      "question": "生产环境发布 Go 程序时应该使用什么编译标志？",
      "options": {
        "A": "不加任何标志",
        "B": "-s -w",
        "C": "只用 -w",
        "D": "只用 -s"
      },
      "answer": "B",
      "explanation": "生产环境发布应该使用 -s -w 组合，体积最小化，最适合发布部署。同时可以结合 -ldflags 注入版本号等构建信息。",
      "source": null,
      "related": []
    },
    {
      "id": "sc-007",
      "type": "single_choice",
      "difficulty": 4,
      "tags": [
        "Go",
        "编译",
        "-ldflags"
      ],
      "question": "go build -ldflags=\"-s -w -X main.Version=1.0\" 中 -X 的作用是什么？",
      "options": {
        "A": "设置编译器参数",
        "B": "在剥离调试信息的同时注入编译时变量",
        "C": "启用交叉编译",
        "D": "设置输出文件名"
      },
      "answer": "B",
      "explanation": "-X 用于在编译时注入变量值，可以同时剥离调试信息（-s -w）和注入版本号、构建时间等信息。",
      "source": null,
      "related": []
    },
    {
      "id": "sc-008",
      "type": "single_choice",
      "difficulty": 3,
      "tags": [
        "Go",
        "编译",
        "调试"
      ],
      "question": "以下哪种场景不应该使用 -s 标志？",
      "options": {
        "A": "生产环境部署",
        "B": "CI/CD 构建产物",
        "C": "本地开发调试",
        "D": "嵌入式/IoT"
      },
      "answer": "C",
      "explanation": "本地开发调试需要完整调试信息，不应该使用 -s 标志。生产环境部署、CI/CD 构建产物、嵌入式/IoT 都适合使用 -s -w。",
      "source": null,
      "related": []
    },
    {
      "id": "sc-009",
      "type": "single_choice",
      "difficulty": 4,
      "tags": [
        "Go",
        "编译",
        "addr2line"
      ],
      "question": "使用 -s -w 后线上出问题，如何通过地址反查行号？",
      "options": {
        "A": "go tool pprof",
        "B": "go tool addr2line",
        "C": "go tool trace",
        "D": "go tool vet"
      },
      "answer": "B",
      "explanation": "如果保留了构建时生成的 debug info 备份，可以用 go tool addr2line 通过地址反查行号。这是 -s -w 后排查问题的方法之一。",
      "source": null,
      "related": []
    },
    {
      "id": "sc-010",
      "type": "single_choice",
      "difficulty": 2,
      "tags": [
        "Go",
        "编译",
        "语言对比"
      ],
      "question": "以下哪种语言有类似 Go -s -w 的功能？",
      "options": {
        "A": "Python",
        "B": "Rust（strip = true in Cargo.toml）",
        "C": "JavaScript",
        "D": "Shell"
      },
      "answer": "B",
      "explanation": "Rust 在 Cargo.toml 中设置 strip = true 可以剥离调试信息，类似 Go 的 -s -w。C/C++ 有 strip 命令，Java 有 ProGuard/R8。",
      "source": null,
      "related": []
    }
  ]
}