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[100% 3/3] out/soong/.bootstrap/bin/soong_build out/soong/build.ninja FAILED: out/soong/build.ninja out/soong/.bootstrap/bin/soong_build -t -l out/.module_paths/Android.bp.list -b out/soong -n out -d out/soong/build.ninja.d -globFile out/soong/.bootstrap/build-globs.ninja -o out/soong/build.ninja Android.bp Clang SA is not enabled error: external/test_prog/Android.bp:1:1: dependency "libc++fs" of "test_prog" missing variant: os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, link:static, version: available variants: os:android, image:, arch:arm64_armv8-a, sdk:, link:static, version: os:android, image:, arch:arm_armv7-a-neon_cortex-a9, sdk:, link:static, version: os:android, image:recovery, arch:arm64_armv8-a, sdk:, link:static os:linux_glibc, arch:x86, link:static os:linux_glibc, arch:x86_64, link:static os:windows, arch:x86, link:static os:windows, arch:x86_64, link:static 17:10:46 soong bootstrap failed with: exit status 1 - 背景
这个错误是由于在.bp文件中引用了libc++fs库，同时这个模块声明了vendor: true属性，但libc++fs不支持vendor使用。
libc++fs这个库是external/libcxx中的一个模块，默认编译方式不允许vendor使用（Android11上C++版本较低，filesystem尚未正式标准化）
cc_binary { name: "test_prog", vendor: true, static_libs: [ // "libc++experimental", "libc++fs", ], ... } - 分析编译报错：
提示：编译模块test_prog依赖libc++fs，缺少可用的版本类型（variant），所需的类型已注明。这个是期望类型。
error: external/test_prog/Android.bp:1:1: dependency "libc++fs" of "test_prog" missing variant: os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, link:static, version: 同时，提示当前可用版本类型（available variants），每行是一个类型。
available variants: os:android, image:, arch:arm64_armv8-a, sdk:, link:static, version: os:android, image:, arch:arm_armv7-a-neon_cortex-a9, sdk:, link:static, version: os:android, image:recovery, arch:arm64_armv8-a, sdk:, link:static os:linux_glibc, arch:x86, link:static os:linux_glibc, arch:x86_64, link:static os:windows, arch:x86, link:static os:windows, arch:x86_64, link:static - 确认可用类型
查找编译目录，找到以下几种平台类型的静态库。前面几种arm类型的都能对应上，x86平台的只编译出来linux_glibc_x86_64_static版本，这个是和当前PC编译环境对应的，其他3中x86类型缺失是由于当前环境下不具备编译条件。
out/soong/.intermediates/external/libcxx/libc++fs$ find . -name *.a ./android_arm64_armv8-a_static_cfi/libc++fs.a ./android_arm_armv7-a-neon_cortex-a9_static/libc++fs.a ./android_recovery_arm64_armv8-a_static/libc++fs.a ./android_arm64_armv8-a_static/libc++fs.a ./linux_glibc_x86_64_static/libc++fs.a - 定位问题
把“期望类型”和“已有类型”对比差异，逐个字段比较，看缺少哪项。
这个例子中发现缺少：image:vendor.30。可以通过libc++fs库对应的.bp文件进行确认。
cc_defaults { name: "libc++ defaults", host_supported: true, // <<---------编译PC主机的对应版本，linux_glibc_x86_64_static ... } cc_library_static { name: "libc++_static", defaults: ["libc++ defaults"], vendor_available: true, // <<---------libc++的静态库vendor可用 ... } cc_library_shared { name: "libc++", host_supported: true, vendor_available: true, // <<---------libc++的动态库vendor可用 ... } cc_library_static { name: "libc++fs", // <<---------无vendor_available选项，vendor不可用 recovery_available: true, defaults: ["libc++ defaults"], // <<---------继承defaults选项，会编译pc host对应的版本，linux_glibc_x86_64_static ... } - 练习题
以下这个错误是什么原因？试着分析一下
FAILED: out/soong/build.ninja out/soong/.bootstrap/bin/soong_build -t -l out/.module_paths/Android.bp.list -b out/soong - n out -d out/soong/build.ninja.d -globFile out/soong/.bootstrap/build-globs.ninja -o out/so ong/build.ninja Android.bp Clang SA is not enabled error: external/test_prog/Android.bp:1:1: dependency "vhal_v2_0_common_headers" of "test_prog" missing variant: os:android, image:, arch:arm64_armv8-a, sdk:, version: available variants: os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, version: os:android, image:vendor.30, arch:arm_armv7-a-neon_cortex-a9, sdk:, version: error: external/test_prog/Android.bp:1:1: dependency "android.hardware.automotive.vehicle@2. 0-manager-lib" of "test_prog" missing variant: os:android, image:, arch:arm64_armv8-a, sdk:, link:shared, version: available variants: os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, link:shared, version: os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, link:static, version: os:android, image:vendor.30, arch:arm_armv7-a-neon_cortex-a9, sdk:, link:shared, version: os:android, image:vendor.30, arch:arm_armv7-a-neon_cortex-a9, sdk:, link:static, version: 17:47:58 soong bootstrap failed with: exit status 1 