{
  "id": "android/ndk-cmake-unknown-abi",
  "signature": "CMake Error at /path/to/android-ndk-r26c/build/cmake/android.toolchain.cmake:XX (message): Unknown ABI: arm64-v8a-hard",
  "signature_zh": "CMake错误在/path/to/android-ndk-r26c/build/cmake/android.toolchain.cmake:XX (message): 未知ABI: arm64-v8a-hard",
  "regex": "CMake Error at .*android\\.toolchain\\.cmake:\\d+ \\(message\\): Unknown ABI: arm64-v8a-hard",
  "domain": "android",
  "category": "build_error",
  "subcategory": null,
  "root_cause": "NDK r26c removed support for the 'arm64-v8a-hard' ABI variant (which had hardware floating-point optimizations) in favor of standard 'arm64-v8a'. Projects still specifying '-hard' suffix in build.gradle or CMakeLists.txt cause this error.",
  "root_cause_type": "generic",
  "root_cause_zh": "NDK r26c移除了对'arm64-v8a-hard' ABI变体（具有硬件浮点优化）的支持，转而使用标准'arm64-v8a'。仍指定'-hard'后缀的项目在build.gradle或CMakeLists.txt中导致此错误。",
  "versions": [
    {
      "version": "Android NDK r26c",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Android NDK r25b",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "CMake 3.22.1",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Gradle 8.5",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Set ANDROID_ABI=arm64-v8a-hard in gradle.properties",
      "why_fails": "NDK r26c no longer recognizes this ABI string. Setting it in properties just passes the same invalid value to CMake.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "Downgrade NDK to r25b",
      "why_fails": "This works temporarily but prevents using newer NDK features and security patches. Also breaks if other libraries require r26c.",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Change build.gradle ndk.abiFilters to use 'arm64-v8a' instead of 'arm64-v8a-hard'. Example: defaultConfig { ndk { abiFilters 'arm64-v8a', 'x86_64' } }",
      "success_rate": 0.95,
      "how": "Change build.gradle ndk.abiFilters to use 'arm64-v8a' instead of 'arm64-v8a-hard'. Example: defaultConfig { ndk { abiFilters 'arm64-v8a', 'x86_64' } }",
      "condition": "",
      "sources": []
    },
    {
      "action": "Update CMakeLists.txt to remove any -hard suffix from target_compile_options or set(CMAKE_ANDROID_ARM_MODE ARM) to ensure soft-float is used. Then clean rebuild.",
      "success_rate": 0.9,
      "how": "Update CMakeLists.txt to remove any -hard suffix from target_compile_options or set(CMAKE_ANDROID_ARM_MODE ARM) to ensure soft-float is used. Then clean rebuild.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Change build.gradle ndk.abiFilters to use 'arm64-v8a' instead of 'arm64-v8a-hard'. Example: defaultConfig { ndk { abiFilters 'arm64-v8a', 'x86_64' } }",
    "Update CMakeLists.txt to remove any -hard suffix from target_compile_options or set(CMAKE_ANDROID_ARM_MODE ARM) to ensure soft-float is used. Then clean rebuild."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://developer.android.com/ndk/guides/abis#arm64-v8a",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.9,
  "fix_success_rate": 0.93,
  "resolvable": "true",
  "first_seen": "2024-03-01",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}