Android16+Kernel6.12 SOC移植报错：无法扩展relative_install_path属性

在为自有SOC适配Android 16 + Kernel 6.12时，构建过程出现如下报错：

Building Android16 with Kernel 6.12 for my SOC

[100% 2/2] analyzing Android.bp files and generating ninja file at host_tools/soong/build.full_erd8855_v.ninja
FAILED: host_tools/soong/build.full_erd8855_v.ninja
cd "$(dirname "host_tools/host/linux-x86/bin/soong_build")" && BUILDER="$PWD/$(basename "host_tools/host/linux-x86/bin/soong_build")" && cd / && env -i  "$BUILDER"     --top "$TOP"     --soong_out "host_tools/soong"     --out "host_tools"     --soong_variables host_tools/soong/soong.full_erd8855_v.variables -o host_tools/soong/build.full_erd8855_v.ninja -l host_tools/.module_paths/Android.bp.list --available_env host_tools/soong/soong.environment.available --used_env host_tools/soong/soong.environment.used.full_erd8855_v.build Android.bp
aidl_ahal = map[ble_offload:true]
aidl_sthal = map[audio_exynos_headers:erd8855_sec audioroute:true]
panic: can't extend property "relative_install_path": failed to find property to extend

关联的Android.bp代码片段：

soong_config_module_type {
    name: "audio_exynos_headers_cc_defaults",
    module_type: "cc_defaults",
    config_namespace: "aidl_sthal",
    variables: [
        "audio_exynos_headers",
    ],
    properties: [
        "header_libs",
    ],
}

soong_config_string_variable {
    name: "audio_exynos_headers",
    values: ["erd8855_sec", "erd9955_sec", "erd9965_sec"],
}

audio_exynos_headers_cc_defaults {
    name: "audio_xxx_headers_default",
    soong_config_variables: {
        audio_exynos_headers: {
            erd8855_sec: {
                header_libs: [
                    "//device/xxx/audio/erd8855_sec/audio:libaudio_xxx_headers",
                ],
            },

该SOC此前在Android 15 + Kernel 6.6环境下适配正常，已确认相关Android.bp中relative_install_path属性语法无误，需排查问题原因。

• 显式声明可扩展属性：当前soong_config_module_type仅注册了header_libs作为可通过soong_config扩展的属性，但报错涉及relative_install_path。Android 16的Soong构建系统对属性扩展的管控更严格，需将该属性加入到properties列表中：

  soong_config_module_type {
      name: "audio_exynos_headers_cc_defaults",
      module_type: "cc_defaults",
      config_namespace: "aidl_sthal",
      variables: [
          "audio_exynos_headers",
      ],
      properties: [
          "header_libs",
          "relative_install_path", // 新增此行，允许扩展该属性
      ],
  }
  

• 检查模块继承链：排查所有继承audio_xxx_headers_default的模块，确认是否有模块尝试通过+=或soong_config扩展relative_install_path属性。若存在此类模块，需确保对应的soong_config_module_type已注册该属性。
• 验证Soong规则变更：Android 16对cc_defaults的属性处理逻辑可能发生变化，对比Android 15的Soong行为，确认relative_install_path是否成为cc_defaults的默认属性，以及是否需要显式声明才能通过soong_config扩展。
• 修复代码语法问题：提供的Android.bp片段存在未闭合的括号，需确保实际代码中所有花括号、方括号都正确闭合，避免语法错误引发的间接问题。

内容的提问来源于stack exchange，提问作者Manjunath Naik C