准备环境
1.安装open-jdk7
【使用open-jdk8会报错】,原因是：
在build/core/main.mk中默认指定的是jdk1.7
# Check for the correct version of java, should be 1.7 by# default, and 1.8 if EXPERIMENTAL_USE_JAVA8 is setifneq ($(EXPERIMENTAL_USE_JAVA8),)required_version := "1.8.x"required_javac_version := "1.8"java_version := $(shell echo '$(java_version_str)' | grep 'openjdk .*[ "]1\.8[\. "$$]')javac_version := $(shell echo '$(javac_version_str)' | grep '[ "]1\.8[\. "$$]')else # defaultrequired_version := "1.7.x"required_javac_version := "1.7"java_version := $(shell echo '$(java_version_str)' | grep '^java .*[ "]1\.7[\. "$$]')javac_version := $(shell echo '$(javac_version_str)' | grep '[ "]1\.7[\. "$$]')endif # if EXPERIMENTAL_USE_JAVA8
我开始就是安装了open-jdk8,然后编译不过，看到这里默认是1.7，如果是试验环境，所以又重新安装的1.7。
这个安装完以后，就准备开始编译Android源码。
2.编译前配置
在.bashrc文件中添加：export USE_CCACHE = 1，操作如下：
echo export USE_CCACE=1 >> ~/.bashrc
为了提高编译效率，设置编译器高速缓存。执行以下命令：
prebuilts/misc/linux-x86/ccache/ccache -M 30G
-M 30G 两个参数表示设置30G大小的空间作为缓存，这个数值可以根据自己的硬盘空间大小继续调整.
编译
接着导入编译Android源码所需的环境变量和其它参数，运行以下命令
source build/envsetup.sh
结果如下：
dongqiang@dongqiang-Lenovo-Y50p-70:/media/dongqiang/learn/learn/Android/android-6.0.0_r1$ source build/envsetup.shincluding device/asus/deb/vendorsetup.shincluding device/asus/flo/vendorsetup.shincluding device/asus/fugu/vendorsetup.shincluding device/generic/mini-emulator-arm64/vendorsetup.shincluding device/generic/mini-emulator-armv7-a-neon/vendorsetup.shincluding device/generic/mini-emulator-mips/vendorsetup.shincluding device/generic/mini-emulator-x86_64/vendorsetup.shincluding device/generic/mini-emulator-x86/vendorsetup.shincluding device/htc/flounder/vendorsetup.shincluding device/lge/hammerhead/vendorsetup.shincluding device/moto/shamu/vendorsetup.shincluding sdk/bash_completion/adb.bashdongqiang@dongqiang-Lenovo-Y50p-70:/media/dongqiang/learn/learn/Android/android-6.0.0_r1$
接着输入lunch
dongqiang@dongqiang-Lenovo-Y50p-70:/media/dongqiang/learn/learn/Android/android-6.0.0_r1$ lunchYou're building on LinuxLunch menu... pick a combo:1. aosp_arm-eng2. aosp_arm64-eng3. aosp_mips-eng4. aosp_mips64-eng5. aosp_x86-eng6. aosp_x86_64-eng7. aosp_deb-userdebug8. aosp_flo-userdebug9. full_fugu-userdebug10. aosp_fugu-userdebug11. mini_emulator_arm64-userdebug12. m_e_arm-userdebug13. mini_emulator_mips-userdebug14. mini_emulator_x86_64-userdebug15. mini_emulator_x86-userdebug16. aosp_flounder-userdebug17. aosp_hammerhead-userdebug18. aosp_hammerhead_fp-userdebug19. aosp_shamu-userdebugWhich would you like? [aosp_arm-eng]
这里选择1，会出现以下提示信息，告诉我们编译的源码的一些相关信息：
Which would you like? [aosp_arm-eng] 1============================================PLATFORM_VERSION_CODENAME=RELPLATFORM_VERSION=6.0TARGET_PRODUCT=aosp_armTARGET_BUILD_VARIANT=engTARGET_BUILD_TYPE=releaseTARGET_BUILD_APPS=TARGET_ARCH=armTARGET_ARCH_VARIANT=armv7-aTARGET_CPU_VARIANT=genericTARGET_2ND_ARCH=TARGET_2ND_ARCH_VARIANT=TARGET_2ND_CPU_VARIANT=HOST_ARCH=x86_64HOST_OS=linuxHOST_OS_EXTRA=Linux-4.4.0-34-generic-x86_64-with-Ubuntu-16.04-xenialHOST_BUILD_TYPE=releaseBUILD_ID=MRA58KOUT_DIR=out============================================dongqiang@dongqiang-Lenovo-Y50p-70:/media/dongqiang/learn/learn/Android/android-6.0.0_r1$
开始编译
make -j8
Error:
1.frameworks/base/tools/aidl/aidl_language_y.y
Import includes file: out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/import_includesYacc: aidl <= frameworks/base/tools/aidl/aidl_language_y.yprebuilts/misc/linux-x86/bison/bison -d -o out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_y.cpp frameworks/base/tools/aidl/aidl_language_y.y/bin/bash: prebuilts/misc/linux-x86/bison/bison: No such file or directorybuild/core/binary.mk:609: recipe for target 'out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_y.cpp' failedmake: *** [out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_y.cpp] Error 127make: *** Waiting for unfinished jobs....Lex: aidl <= frameworks/base/tools/aidl/aidl_language_l.lframeworks/base/tools/aidl/aidl_language_l.l:55: warning, rule cannot be matchedflex-2.5.39: fatal internal error, exec of /usr/bin/m4 failedbuild/core/binary.mk:646: recipe for target 'out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_l.cpp' failedmake: *** [out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_l.cpp] Broken pipemake: *** Deleting file 'out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_l.cpp'Note: Some input files use unchecked or unsafe operations.Note: Recompile with -Xlint:unchecked for details.Note: Some input files use unchecked or unsafe operations.Note: Recompile with -Xlint:unchecked for details.#### make failed to build some targets (08:18 (mm:ss)) ####
解决方法：
sudo apt-get install bison
接着编译还是错
Yacc: aidl <= frameworks/base/tools/aidl/aidl_language_y.yLex: aidl <= frameworks/base/tools/aidl/aidl_language_l.lprebuilts/misc/linux-x86/bison/bison -d -o out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_y.cpp frameworks/base/tools/aidl/aidl_language_y.y/bin/bash: prebuilts/misc/linux-x86/bison/bison: No such file or directorybuild/core/binary.mk:609: recipe for target 'out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_y.cpp' failedmake: *** [out/host/linux-x86/obj/EXECUTABLES/aidl_intermediates/aidl_language_y.cpp] Error 127make: *** Waiting for unfinished jobs....
2.
/bin/bash: xmllint: command not found/bin/bash: xmllint: command not foundbuild/core/Makefile:34: recipe for target 'out/target/product/generic/system/etc/apns-conf.xml' failedmake: *** [out/target/product/generic/system/etc/apns-conf.xml] Error 127make: *** Waiting for unfinished jobs....build/core/Makefile:34: recipe for target 'out/target/product/generic/system/etc/permissions/handheld_core_hardware.xml' failedmake: *** [out/target/product/generic/system/etc/permissions/handheld_core_hardware.xml] Error 127
解决办法：
sudo apt-get install libxml2-utils
3.
接下来还是错：
Device TableGen (gen-intrinsic): libLLVMipa <= external/llvm/include/llvm/IR/Intrinsics.tdclang: error: linker command failed with exit code 1 (use -v to see invocation)build/core/host_shared_library_internal.mk:51: recipe for target 'out/host/linux-x86/obj/lib/libart.so' failedmake: *** [out/host/linux-x86/obj/lib/libart.so] Error 1make: *** Waiting for unfinished jobs....clang: error: linker command failed with exit code 1 (use -v to see invocation)build/core/host_shared_library_internal.mk:51: recipe for target 'out/host/linux-x86/obj/lib/libartd.so' failedmake: *** [out/host/linux-x86/obj/lib/libartd.so] Error 1
【我安装了下下面这些，究竟有没有用还需要试验：】
sudo apt-get install libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-dev g++-multilib
然后在网上搜了下，这个问题的解决方法：
http://forum.xda-/chef-central/android/guide-how-to-setup-ubuntu-16-04-lts-t3363669/page2
注意看这个帖子的15楼，哈哈，这个时候找到解决方法了,再修改art/build/mon_build.mk文件
ifneq ($(WITHOUT_HOST_CLANG),true)
改为：
ifeq ($(WITHOUT_HOST_CLANG),false)
执行：
sudo vi art/build/mon_build.mk/WITHOUT_HOST_CLANG #搜索该字符的位置
在第74行：
# Clang build support.# Host.ART_HOST_CLANG := falseifneq ($(WITHOUT_HOST_CLANG),false)# By default, host builds use clang for better warnings.ART_HOST_CLANG := trueendif
进行修改，然后继续make -j8编译。反复执行几次就可以了。
编译成功
Creating filesystem with parameters:Size: 1610612736Block size: 4096Blocks per group: 32768Inodes per group: 8192Inode size: 256Journal blocks: 6144Label: systemBlocks: 393216Block groups: 12Reserved block group size: 95Created filesystem with 1696/98304 inodes and 138385/393216 blocksInstall system fs image: out/target/product/generic/system.imgout/target/product/generic/system.img+ maxsize=1644333504 blocksize=2112 total=1610612736 reserve=16610880#### make completed successfully (03:39:54 (hh:mm:ss)) ####dongqiang@dongqiang-Lenovo-Y50p-70:/media/dongqiang/learn/learn/Android/android-6.0.0_r1$
进入out目录可以看到编译生成的文件：
dongqiang@dongqiang-Lenovo-Y50p-70:/media/dongqiang/learn/learn/Android/android-6.0.0_r1/out/target/product/generic$ lltotal 1590669drwxrwxrwx 1 dongqiang dongqiang 4096 9月 24 15:02 ./drwxrwxrwx 1 dongqiang dongqiang0 9月 22 23:11 ../-rwxrwxrwx 1 dongqiang dongqiang7 9月 24 10:14 android-info.txt*drwxrwxrwx 1 dongqiang dongqiang0 9月 24 13:14 cache/-rwxrwxrwx 1 dongqiang dongqiang 69206016 9月 24 13:14 cache.img*-rwxrwxrwx 1 dongqiang dongqiang70391 9月 24 11:28 clean_steps.mk*drwxrwxrwx 1 dongqiang dongqiang0 9月 24 13:46 data/drwxrwxrwx 1 dongqiang dongqiang0 9月 24 13:09 dex_bootjars/drwxrwxrwx 1 dongqiang dongqiang0 9月 24 00:31 gen/-rwxrwxrwx 1 dongqiang dongqiang70522 9月 24 15:01 installed-files.txt*drwxrwxrwx 1 dongqiang dongqiang 4096 9月 24 15:01 obj/-rwxrwxrwx 1 dongqiang dongqiang 761 9月 24 11:28 previous_build_config.mk*-rwxrwxrwx 1 dongqiang dongqiang888961 9月 24 13:32 ramdisk.img*drwxrwxrwx 1 dongqiang dongqiang0 9月 24 13:32 recovery/drwxrwxrwx 1 dongqiang dongqiang 4096 9月 24 13:32 root/drwxrwxrwx 1 dongqiang dongqiang 4096 9月 24 13:31 symbols/drwxrwxrwx 1 dongqiang dongqiang 4096 9月 24 14:13 system/-rwxrwxrwx 1 dongqiang dongqiang 1610612736 9月 24 15:02 system.img*-rwxrwxrwx 1 dongqiang dongqiang 576716800 9月 24 13:47 userdata.img*dongqiang@dongqiang-Lenovo-Y50p-70:/media/dongqiang/learn/learn/Android/android-6.0.0_r1/out/target/product/generic$
执行emulator
可以看到打开了模拟器.
