修改Android作業系統

摘要： 首次編譯 如果用Ubuntu 18.04編譯Android 7.1.2原始碼，需要在make 前執行export LC_ALL=C 。 export JACK_SERVER_VM_ARGUMENTS="-Dfile.encodin...

首次編譯

如果用Ubuntu 18.04編譯Android 7.1.2原始碼，需要在make 前執行export LC_ALL=C 。

export JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4g"

增加JVM堆大小。然後重啟jack。

編譯單獨模組

執行. build/envsetup.sh之後，輸入hmm可以看幫助

$ hmm
Invoke ". build/envsetup.sh" from your shell to add the following functions to your environment:
- lunch:lunch <product_name>-<build_variant>
- tapas:tapas [<App1> <App2> ...] [arm|x86|mips|armv5|arm64|x86_64|mips64] [eng|userdebug|user]
- croot:Changes directory to the top of the tree.
- m:Makes from the top of the tree.
- mm:Builds all of the modules in the current directory, but not their dependencies.
- mmm:Builds all of the modules in the supplied directories, but not their dependencies.
To limit the modules being built use the syntax: mmm dir/:target1,target2.
- mma:Builds all of the modules in the current directory, and their dependencies.
- mmma:Builds all of the modules in the supplied directories, and their dependencies.
- provision: Flash device with all required partitions. Options will be passed on to fastboot.
- cgrep:Greps on all local C/C++ files.
- ggrep:Greps on all local Gradle files.
- jgrep:Greps on all local Java files.
- resgrep:Greps on all local res/*.xml files.
- mangrep:Greps on all local AndroidManifest.xml files.
- mgrep:Greps on all local Makefiles files.
- sepgrep:Greps on all local sepolicy files.
- sgrep:Greps on all local source files.
- godir:Go to the directory containing a file.

Environment options:
- SANITIZE_HOST: Set to 'true' to use ASAN for all host modules. Note that
ASAN_OPTIONS=detect_leaks=0 will be set by default until the
build is leak-check clean.

Look at the source to view more functions. The complete list is:
addcompletions add_lunch_combo build_build_var_cache cgrep check_product check_variant choosecombo chooseproduct choosetype choosevariant core coredump_enable coredump_setup cproj croot destroy_build_var_cache findmakefile get_abs_build_var getbugreports get_build_var getdriver getlastscreenshot get_make_command getprebuilt getscreenshotpath getsdcardpath gettargetarch gettop ggrep godir hmm is isviewserverstarted jgrep key_back key_home key_menu lunch _lunch m make mangrep mgrep mm mma mmm mmma pez pid printconfig print_lunch_menu provision qpid rcgrep resgrep runhat runtest sepgrep set_java_home setpaths set_sequence_number set_stuff_for_environment settitle sgrep smoketest stacks startviewserver stopviewserver systemstack tapas tracedmdump treegrep

似乎沒有網上的官方文件提供以上內容，除了原始碼 。

既然編譯單獨模組，就使用mm命令。經實測，似乎必須指定模組目錄

WORKING_DIRECTORY$ mm art

而不是

WORKING_DIRECTORY/art$ mm

用後一個方法似乎某些配置檔案不會匯入，程式碼樣式會出錯。待探究。

重新打包

$ make snod

怎麼知道這個命令呢？

編譯結果放在WORKING_DIRECTORY/out/target/product/generic_x86，其中generic_x86是以前選擇的lunch combo。

程式碼庫管理

在一個倉庫裡刪除某些標籤

git tag –list ‘android-*’ | xargs -I % git tag -d %

獲取指定的標籤

似乎要先獲取所有標籤，再刪除所有標籤，再獲取指定標籤。一定有比這更好的辦法。

git fetch fork refs/tags/android-7.1.2_r36

參考資料

shui1025701856.https://blog.csdn.net/shui1025701856/article/details/80497911 . . 2018-05-29 [2019-02-22]. Daemon369.編譯Android原始碼中的單獨模組 . . 2013-08-22 [2019-03-25]. 羅昇陽.如何單獨編譯Android原始碼中的模組

. . 2011-06-24 [2019-03-25].