在MacOS编译AOSP时遇到的问题和解决方案

持续更新中...

1、文本解析错误

TOYBOX_VERSION awk: bailing out at source line 1
解决：使用gawk替换awk

brew install gawk

2、MacOS SDK版本问题

在较新版本的mac系统下编译aosp可能会出现MAC_SDK_VERSION ${版本号} isn't supported ...或者MAC_SDK_VERSION 10.13 is not installed.

aosp所使用的sdk版本一般都很低，这里为了编译通过我们需要下载旧版本的sdk。

旧版本下载地址：https://github.com/phracker/MacOSX-SDKs

下载旧版本的sdk解压到/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/

修改xcode的最低SDK支持版本

cp /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/info.plist ~/Downloads

编辑文件~/Downloads/info.plist，将MinimumSDKVersion的值改为10.11,编辑完成后，再复制回去

推荐使用vscode进行编辑，需要安装扩展Binary Plist

sudo cp -f ~/Downloads/info.plist /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/info.plist 

完成，最后编译时指定下sdk版本MAC_SDK_VERSION=10.13即可：

MAC_SDK_VERSION=10.13 make -j8

如果需要自定义sdk版本的可以修改build/soong/cc/config/x86_darwin_host.go文件，进行以下修改：

    darwinSupportedSdkVersions = []string{
        "10.10",
        "10.11",
        "10.12",
        "10.13",
        "10.14", // 新增
        "10.15", // 新增
        "11.0", // 新增
        "11.1", // 新增
        "11.3", // 新增
    }

在最新版本的源代码中，官方已经开始支持11.0和11.1的版本：https://android.googlesource.com/platform/build/soong/+/refs/heads/master/cc/config/x86_darwin_host.go

3、SELinux问题

错误日志：

[  0% 4/29298] build out/target/product/keyaki/obj/ETC/sepolicy_tests_intermediates/sepolicy_tests
FAILED: out/target/product/keyaki/obj/ETC/sepolicy_tests_intermediates/sepolicy_tests 
/bin/bash -c "(out/host/darwin-x86/bin/sepolicy_tests -l out/host/darwin-x86/lib64/libsepolwrap.dylib        -f out/target/product/keyaki/obj/ETC/plat_file_contexts_intermediates/plat_file_contexts  -f out/target/product/keyaki/obj/ETC/vendor_file_contexts_intermediates/vendor_file_contexts  -p out/target/product/keyaki/obj/ETC/sepolicy_intermediates/sepolicy ) && (touch out/target/product/keyaki/obj/ETC/sepolicy_tests_intermediates/sepolicy_tests )"
/bin/bash: line 1: 36384 Segmentation fault: 11  ( out/host/darwin-x86/bin/sepolicy_tests -l out/host/darwin-x86/lib64/libsepolwrap.dylib -f out/target/product/keyaki/obj/ETC/plat_file_contexts_intermediates/plat_file_contexts -f out/target/product/keyaki/obj/ETC/vendor_file_contexts_intermediates/vendor_file_contexts -p out/target/product/keyaki/obj/ETC/sepolicy_intermediates/sepolicy )
ninja: build stopped: subcommand failed.
00:08:06 ninja failed with: exit status 1

#### failed to build some targets (22 seconds) ####

类似

FAILED: build out/target/product/${设备名称}/obj/ETC/sepolicy_tests_intermediates/sepolicy_tests

这样开头的错误基本属于SELinux的异常

临时解决方案：

make SELINUX_IGNORE_NEVERALLOWS=true

但是只是临时方案，关闭了SELinux功能，但是发布aosp版本时是需要打开的

谷歌官方的方案：
https://android.googlesource.com/platform/system/sepolicy/+/1f944107a3341ab593c93bbdf09e22436cc0e3d3%5E%21/#F0

修改文件system/sepolicy/tests/Android.bp，注释掉第14行的stl:"libc++_static",

@@ -11,7 +11,6 @@
         "libbase",
         "libsepol",
     ],
-    stl: "libc++_static",
     sanitize: {
         never: true,
     },