android 编译步骤分析之envsetup.sh

1. cd AP 进入AP目录，如果已经进入到了A目录，可以忽略
2. source build/envsetup.sh 初始编译环境，envsetup.sh里面是一些编译命令，类似于linxu自带的ls cd等指令

 cwm@cwm-OptiPlex-7060:~/work/project/gm/android_p/AP$ source build/envsetup.sh including device/generic/car/vendorsetup.shincluding device/generic/mini-emulator-arm64/vendorsetup.shincluding device/generic/mini-emulator-armv7-a-neon/vendorsetup.shincluding device/generic/mini-emulator-x86_64/vendorsetup.shincluding device/generic/mini-emulator-x86/vendorsetup.shincluding device/generic/uml/vendorsetup.shincluding device/google/muskie/vendorsetup.shincluding device/google/taimen/vendorsetup.shincluding device/qcom/common/vendorsetup.shincluding device/qcom/qssi/vendorsetup.shincluding vendor/dolby/device/sailfish_dax1_sw/vendorsetup.shincluding vendor/dolby/device/walleye_dax1_sw/vendorsetup.shincluding vendor/qcom/opensource/core-utils/vendorsetup.shincluding vendor/qcom/proprietary/common/vendorsetup.shincluding sdk/bash_completion/adb.bash

3. lunch 这个lunc命令执行了第二步以后，在当前环境存在的，选择的是第40个选项 40. msm8937_64-userdebug

cwm@cwm-OptiPlex-7060:~/work/project/gm/android_p/AP$ 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_car_arm-userdebug8. aosp_car_arm64-userdebug9. aosp_car_x86-userdebug10. aosp_car_x86_64-userdebug11. mini_emulator_arm64-userdebug12. m_e_arm-userdebug13. mini_emulator_x86_64-userdebug14. mini_emulator_x86-userdebug15. uml-userdebug16. aosp_walleye-userdebug17. aosp_walleye_test-userdebug18. aosp_taimen-userdebug19. msm8974-userdebug20. msm8610-userdebug21. msm8226-userdebug22. apq8084-userdebug23. mpq8092-userdebug24. msm_bronze-userdebug25. msm8916_32-userdebug26. msm8916_32_512-userdebug27. msm8916_32_k64-userdebug28. msm8916_64-userdebug29. msm8994-userdebug30. msm8996-userdebug31. msm8909-userdebug32. msm8909go-userdebug33. msm8909_512-userdebug34. msm8909_512go-userdebug35. msm8992-userdebug36. msm8952_64-userdebug37. msm8952_32-userdebug38. msm8937_32-userdebug39. msm8937_32go-userdebug40. msm8937_64-userdebug41. msm8953_32-userdebug42. msm8953_64-userdebug43. msm8998-userdebug44. msm8998_32-userdebug45. sdm660_64-userdebug46. sdm660_32-userdebug47. sdm845-userdebug48. apq8098_latv-userdebug49. sdm710-userdebug50. msmnile-userdebug51. msmnile_au-userdebug52. qcs605-userdebug53. talos-userdebug54. talos_au-userdebug55. qssi-userdebug56. sailfish_dax1_sw-userdebug57. walleye_dax1_sw-userdebugWhich would you like? [aosp_arm-eng] 40

4. make -j6 开始编译根据需要选择自己的核数

第2步的envsetup.sh脚本分析之lunch命令


function lunch()
{local answerif [ "$1" ] ; thenanswer=$1  #如果lunch时带参数，那么就执行这条语句elseprint_lunch_menu  #把所支持的平台信息显示在终端，用于平台选择，此函数在下面有分析echo -n "Which would you like? [aosp_arm-eng] "read answerfilocal selection=if [ -z "$answer" ]thenselection=aosp_arm-engelif (echo -n $answer | grep -q -e "^[0-9][0-9]*$")thenif [ $answer -le ${#LUNCH_MENU_CHOICES[@]} ]thenselection=${LUNCH_MENU_CHOICES[$(($answer-1))]}fielseselection=$answerfiexport TARGET_BUILD_APPS=local product variant_and_version variant versionproduct=${selection%%-*} # Trim everything after first dashvariant_and_version=${selection#*-} # Trim everything up to first dashif [ "$variant_and_version" != "$selection" ]; thenvariant=${variant_and_version%%-*}if [ "$variant" != "$variant_and_version" ]; thenversion=${variant_and_version#*-}fifiif [ -z "$product" ]thenechoecho "Invalid lunch combo: $selection"return 1fiTARGET_PRODUCT=$product \TARGET_BUILD_VARIANT=$variant \TARGET_PLATFORM_VERSION=$version \build_build_var_cacheif [ $? -ne 0 ]thenreturn 1fiexport TARGET_PRODUCT=$(get_build_var TARGET_PRODUCT)export TARGET_BUILD_VARIANT=$(get_build_var TARGET_BUILD_VARIANT)if [ -n "$version" ]; thenexport TARGET_PLATFORM_VERSION=$(get_build_var TARGET_PLATFORM_VERSION)elseunset TARGET_PLATFORM_VERSIONfiexport TARGET_BUILD_TYPE=releaseechoset_stuff_for_environmentprintconfigdestroy_build_var_cache
}

print_lunch_menu函数分析

function print_lunch_menu()
{local uname=$(uname)echoecho "You're building on" $unameechoecho "Lunch menu... pick a combo:"local i=1local choicefor choice in ${LUNCH_MENU_CHOICES[@]} #LUNCH_MENU_CHOICES保存的是所有平台信息，平台信息收集是通过add_lunch_combo函数doecho "     $i. $choice"i=$(($i+1))doneecho
}

add_lunch_combo函数分析

unset LUNCH_MENU_CHOICES
function add_lunch_combo()  #调用此函数，同时跟一个代表平台信息的参数，此函数会在不同目录下的vendorsetup.sh脚本被调用
{local new_combo=$1local cfor c in ${LUNCH_MENU_CHOICES[@]} ; doif [ "$new_combo" = "$c" ] ; thenreturnfidoneLUNCH_MENU_CHOICES=(${LUNCH_MENU_CHOICES[@]} $new_combo)
}

遍历的目录包含device vendor product

# Execute the contents of any vendorsetup.sh files we can find.
for f in `test -d device && find -L device -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/null | sort` \`test -d vendor && find -L vendor -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/null | sort` \`test -d product && find -L product -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/null | sort`
doecho "including $f". $f
done
unset f

查看device/qcom/common目录下的vendorsetup.sh，加载了以下平台信息

#
#  Copyright (c) 2012, The Linux Foundation. All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are
#  met:
#       * Redistributions of source code must retain the above copyright
#         notice, this list of conditions and the following disclaimer.
#       * Redistributions in binary form must reproduce the above
#         copyright notice, this list of conditions and the following
#         disclaimer in the documentation and/or other materials provided
#         with the distribution.
#       * Neither the name of The Linux Foundation nor the names of its
#         contributors may be used to endorse or promote products derived
#         from this software without specific prior written permission.
#
#  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
#  ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
#  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
#  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
#  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
#  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#add_lunch_combo msm8974-userdebug
add_lunch_combo msm8610-userdebug
add_lunch_combo msm8226-userdebug
add_lunch_combo apq8084-userdebug
add_lunch_combo mpq8092-userdebug
add_lunch_combo msm_bronze-userdebug
add_lunch_combo msm8916_32-userdebug
add_lunch_combo msm8916_32_512-userdebug
add_lunch_combo msm8916_32_k64-userdebug
add_lunch_combo msm8916_64-userdebug
add_lunch_combo msm8994-userdebug
add_lunch_combo msm8996-userdebug
add_lunch_combo msm8909-userdebug
add_lunch_combo msm8909go-userdebug
add_lunch_combo msm8909_512-userdebug
add_lunch_combo msm8909_512go-userdebug
add_lunch_combo msm8992-userdebug
add_lunch_combo msm8952_64-userdebug
add_lunch_combo msm8952_32-userdebug
add_lunch_combo msm8937_32-userdebug
add_lunch_combo msm8937_32go-userdebug
add_lunch_combo msm8937_64-userdebug
add_lunch_combo msm8953_32-userdebug
add_lunch_combo msm8953_64-userdebug
add_lunch_combo msm8998-userdebug
add_lunch_combo msm8998_32-userdebug
add_lunch_combo sdm660_64-userdebug
add_lunch_combo sdm660_32-userdebug
add_lunch_combo sdm845-userdebug
add_lunch_combo apq8098_latv-userdebug
add_lunch_combo sdm710-userdebug
add_lunch_combo msmnile-userdebug
add_lunch_combo msmnile_au-userdebug
add_lunch_combo qcs605-userdebug
add_lunch_combo talos-userdebug
add_lunch_combo talos_au-userdebug

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