1、背景说明

虚拟机：wsl 2.0 Ubuntu18.04
虚拟机配置：8G内存，1T存储
软件版本：安卓系统目前最高版本是Android S,也就是Android 12 beta版本源码，无任何修改
报错内容：编译至54%时，ninja编译中断，ninja: build stopped: subcommand failed.

[ 54% 26841/49115] //prebuilts/rust:libtest rustc linux-x86/1.51.0/src/stdlibs/library/test/src/lib.rs
[ 54% 26842/49115] //frameworks/av/services/mediametrics:mediametrics clang++ main_mediametrics.cpp
[ 54% 26843/49115] Copy: out/target/product/G10/symbols/system/lib/libtest.dylib.so
[ 54% 26844/49115] //frameworks/av/media/libmediatranscoding:mediatranscoding_aidl_interface-ndk_platform clang++ android/media/TranscodingResultParcel.cpp [com.android.media]
[ 54% 26845/49115] //frameworks/compile/libbcc/bcinfo:libbcinfo header-abi-linker libbcinfo.so.lsdump
FAILED: out/soong/.intermediates/frameworks/compile/libbcc/bcinfo/libbcinfo/android_vendor.31_arm_armv7-a-neon_cortex-a7_shared/libbcinfo.so.lsdump
prebuilts/clang-tools/linux-x86/bin/header-abi-linker -o out/soong/.intermediates/frameworks/compile/libbcc/bcinfo/libbcinfo/android_vendor.31_arm_armv7-a-neon_cortex-a7_shared/libbcinfo.so.lsdump -so out/soong/.intermediates/frameworks/compile/libbcc/bcinfo/libbcinfo/android_vendor.31_arm_armv7-a-neon_cortex-a7_shared/libbcinfo.so -arch arm  -Iframeworks/compile/libbcc/bcinfo/include @out/soong/.intermediates/frameworks/compile/libbcc/bcinfo/libbcinfo/android_vendor.31_arm_armv7-a-neon_cortex-a7_shared/libbcinfo.so.lsdump.rsp 
Failed to parse JSON: * Line 1, Column 1
  Syntax error: value, object or array expected.

ReadDump failed
[ 54% 26846/49115] //prebuilts/gradle-plugin:metalava-gradle-plugin-deps for prebuilts [linux_glibc common]
[ 54% 26847/49115] //external/rust/crates/android_log-sys:libandroid_log_sys rustc src/lib.rs
[ 54% 26848/49115] //frameworks/base/media:media_permission-aidl-cpp clang-tidy android/media/permission/Identity.cpp
[ 54% 26849/49115] //frameworks/av/media/libmediametrics:mediametricsservice-aidl-cpp clang-tidy android/media/IMediaMetricsService.cpp
[ 54% 26850/49115] build out/target/product/G10/gen/META/lic_intermediates/webrtc_agc__agc.meta_lic
[ 54% 26851/49115] //frameworks/av/media/codec2/components/aac:libcodec2_soft_aacdec link libcodec2_soft_aacdec.so
[ 54% 26852/49115] //external/rust/crates/anyhow:libanyhow rustc src/lib.rs
[ 54% 26853/49115] //external/rust/crates/anyhow:libanyhow rustc src/lib.rs
[ 54% 26854/49115] build out/target/product/G10/gen/META/lic_intermediates/libbt-stack.meta_lic
[ 54% 26855/49115] build out/target/product/G10/gen/META/lic_intermediates/audio.a2dp.default.meta_lic
[ 54% 26856/49115] build out/target/product/G10/gen/META/lic_intermediates/libbt-audio-hal-interface.meta_lic
[ 54% 26857/49115] //frameworks/av/media/libmediatranscoding:mediatranscoding_aidl_interface-ndk_platform clang-tidy android/media/TranscodingSessionStats.cpp [com.android.media]
[ 54% 26858/49115] build out/target/product/G10/gen/META/lic_intermediates/avrcp-target-service.meta_lic
[ 54% 26859/49115] //frameworks/av/media/libmediatranscoding:mediatranscoding_aidl_interface-ndk_platform clang-tidy android/media/ITranscodingClientCallback.cpp [com.android.media]
[ 54% 26860/49115] //frameworks/av/media/libmediatranscoding:mediatranscoding_aidl_interface-ndk_platform clang-tidy android/media/TranscodingVideoTrackFormat.cpp [com.android.media]
[ 54% 26861/49115] //frameworks/av/media/libmediatranscoding:mediatranscoding_aidl_interface-ndk_platform clang-tidy android/media/IMediaTranscodingService.cpp [com.android.media]
[ 54% 26862/49115] //frameworks/av/media/libmediatranscoding:mediatranscoding_aidl_interface-ndk_platform clang-tidy android/media/ITranscodingClient.cpp [com.android.media]
[ 54% 26863/49115] //frameworks/av/media/libmediatranscoding:mediatranscoding_aidl_interface-ndk_platform clang-tidy android/media/TranscodingSessionParcel.cpp [com.android.media]
[ 54% 26864/49115] //frameworks/av/media/libmediatranscoding:mediatranscoding_aidl_interface-ndk_platform clang-tidy android/media/TranscodingRequestParcel.cpp [com.android.media]
[ 54% 26865/49115] //art/dexlayout:libart-dexlayout link libart-dexlayout.so [apex31]
[ 54% 26866/49115] //frameworks/av/media/codec2/components/hevc:libcodec2_soft_hevcenc link libcodec2_soft_hevcenc.so
[ 54% 26867/49115] //external/libvpx:libvpx link libvpx.so
[ 54% 26868/49115] //frameworks/av/media/codec2/components/gav1:libcodec2_soft_av1dec_gav1 link libcodec2_soft_av1dec_gav1.so
[ 54% 26869/49115] //external/libvpx:libvpx link libvpx.so
[ 54% 26870/49115] //system/logging/logd:logd link logd
ninja: build stopped: subcommand failed.
19:21:50 ninja failed with: exit status 1

[0;31m#### failed to build some targets (09:08 (mm:ss)) ####[00m


#### failed to exec [make droid dist BUILD_RTK_STYLE_IMAGE=true DIST_DIR=/home/daqiang_ni/samba/airplay75p/vendor/realtek/common/kernel/system/tmp/dist/android] (09:08 (mm:ss)) ####
tcl ret_tclbuild = 1

#### failed to exec [trom_build] (22:50 (mm:ss)) ####

2、尝试方案

报错后尝试多次增量编译，始终在54%作用报错，报错内容一致。
怀疑sync未拉完整，重新repo sync，提示success,再次编译仍报错。
其他同事表示能编译通过，考虑到编译环境不同，采用VMWare虚拟机环境编译，仍97%报相同错误。
尝试make clean,rm -rf out/清除编译环境后编译，仍报错。
查阅资料提示由于编译时linux内存不足导致编译中断，wsl2 扩展VHD 至10G(方法如下)，仍报相同错误。
添加wsl2配置文件
C:\Users\userName路径添加.wslconfig文件
.wslconfig

[wsl2]
memory=10GB
processors=8

.wslconfig内容如上，内存配置为10GB，处理器8核即16线程
重启Ubuntu18.04，查看内存情况,已修改为10GB

$ free memory -h
              total        used        free      shared  buff/cache   available
Mem:           9.7G        2.6G        1.8G         36K        5.3G        6.9G
Swap:          3.0G         33M        3.0G

3、问题分析及处理

使用如下命令在编译时间隔1秒持续打印linux内存使用情况，当发生报错时内存仅剩110MB左右，基本可以判断是由于编译时系统内存吃紧导致的编译中断

$watch -d -n 1 free memory -h
Every 1.0s: free memory -h                                                                                                                                                                                  gd08575: Tue Aug  2 09:41:24 2022
              total        used        free      shared  buff/cache   available
Mem:           9.7G        2.9G        912M         36K        5.9G        6.6G
Swap:          3.0G         37M        3.0G

#或者使用命令

$ while true;do free memory -h;sleep 1;done
              total        used        free      shared  buff/cache   available
Mem:           9.7G        3.5G        4.1G         36K        2.1G        6.0G
Swap:          3.0G         41M        3.0G
              total        used        free      shared  buff/cache   available
Mem:           9.7G        3.3G        4.2G         36K        2.2G        6.1G
Swap:          3.0G         41M        3.0G
...

当报错后查看内存，可用内存大概4GB甚至更少，使用htop命令查看linux进程发现仍有很多编译进程在跑，因此尝试重启wsl2释放内存后再编译

#关闭Ubuntu18.04LTS后，管理员权限打开WindowsPowerShell重启wsl
$wsl --shutdown

进入Ubuntu18.05LTS检测内存情况,9GB可用，重试Android 增量编译，编译success！

参考学习