android :

error-------------------------------------------------------------
make: Entering directory '/home/*/android_code/linux/kernel’
make[1]: Entering directory ‘/home/***/android_code/out/target/product/spectralite/linux/kernel’
CHK include/config/kernel.release
GEN ./Makefile
CHK include/generated/uapi/linux/version.h
Using /home//***//android_code/linux/kernel as source for kernel
/home//***//android_code/linux/kernel is not clean, please run ‘make mrproper’
in the ‘/home//***//android_code/linux/kernel’ directory.
/home//***//android_code/linux/kernel/Makefile:969: recipe for target ‘prepare3’ failed
make[1]: *** [prepare3] Error 1
make[1]: *** Waiting for unfinished jobs…
make[1]: *** wait: No child processes. Stop.
Makefile:146: recipe for target ‘sub-make’ failed
make: *** [sub-make] Error 2
make: Leaving directory ‘/home//***//android_code/linux/kernel’
[ 38% 56/147] Ensure Jack server is installed and started
Jack server already installed in "/home//*//.jack-server"
Server is already running
ninja: build stopped: subcommand failed.
build/core/ninja.mk:148: recipe for target ‘ninja_wrapper’ failed
make: *** [ninja_wrapper] Error 1

make failed to build some targets (12:57 (mm:ss))

為 Android 工程編譯核心失敗，報錯資訊為：

 kernel/ is not clean, please run 'make mrproper'

於是執行 make mrproper 命令，但又報錯找不到 mrproper 目標。
其實我們這時如果在 kernel/Makefile 檔案中搜索 "is not clean" 字串，
就可以找到下面這段程式碼：

prepare3: include/config/kernel.release
ifneq ($(KBUILD_SRC),)
	@$(kecho) '  Using $(srctree) as source for kernel'
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
		/bin/false; \
	fi;
endif

 

這時我們就可以看到，當 kernel/ 目錄下存在 .config 檔案或在 kernel/include/ 目錄下存在 config/ 目錄時，shell 就會列印本段開頭看到的錯誤資訊並退出。相應的，問題的解決方法就是刪除這 2 個物件。 進入 kernel/ 目錄下查詢，不存在 .config 檔案；再進入 kernel/include/ 目錄下查詢，果然發現了 config/ 目錄！進入該目錄檢視發現它竟然是空的（一個空的目錄竟然能導致整個工程編譯失敗，果然細節影響成敗啊！）。刪除掉 config/ 目錄後回到 Android 工程頂層，重新執行 source 和 lunch 命令，重新編譯。編譯通過！

make_ext4fs -s -T -1 -S out/target/product/tb8167p3_bsp/obj/ETC/file_contexts.bin_intermediates/file_contexts.bin -L system -l 2378190848 -a system out/target/product/tb8167p3_bsp/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/tb8167p3_bsp/system out/target/product/tb8167p3_bsp/system
Creating filesystem with parameters:
    Size: 2378190848
    Block size: 4096
    Blocks per group: 32768
    Inodes per group: 8080
    Inode size: 256
    Journal blocks: 9072
    Label: system
    Blocks: 580613
    Block groups: 18
    Reserved block group size: 143
Created filesystem with 2432/145440 inodes and 294508/580613 blocks
Running:  build_verity_tree -A aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 out/target/product/tb8167p3_bsp/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpUJKQZz_verity_images/verity.img
ae67c59cc47ef1c6617ec24fb8e98cec14dd07bfa7fae6db269e31fa368b96ab aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7
Running:  system/extras/verity/build_verity_metadata.py build 2378190848 /tmp/tmpUJKQZz_verity_images/verity_metadata.img ae67c59cc47ef1c6617ec24fb8e98cec14dd07bfa7fae6db269e31fa368b96ab aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 /dev/block/platform/soc/11120000.mmc/by-name/system verity_signer build/target/product/security/verity.pk8
['verity_signer', '/tmp/tmp0Hmlji.table', 'build/target/product/security/verity.pk8', '/tmp/tmpOLmOqV.sig']
appending /tmp/tmpUJKQZz_verity_images/verity_metadata.img to /tmp/tmpUJKQZz_verity_images/verity.img
Running:  fec -e -p 0 out/target/product/tb8167p3_bsp/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpUJKQZz_verity_images/verity.img /tmp/tmpUJKQZz_verity_images/verity_fec.img
encoding RS(255, 253) to '/tmp/tmpUJKQZz_verity_images/verity_fec.img' for input files:
	1: 'out/target/product/tb8167p3_bsp/obj/PACKAGING/systemimage_intermediates/system.img'
	2: '/tmp/tmpUJKQZz_verity_images/verity.img'
appending /tmp/tmpUJKQZz_verity_images/verity_fec.img to /tmp/tmpUJKQZz_verity_images/verity.img
Running:  append2simg out/target/product/tb8167p3_bsp/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpUJKQZz_verity_images/verity.img

[100% 8867/8867] Install system fs image: out/target/product/tb8167p3_bsp/system.img
out/target/product/tb8167p3_bsp/system.img+out/target/product/tb8167p3_bsp/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p maxsize=2466499200 blocksize=4224 total=1207988115 reserve=24917376

#### build completed successfully (16:35 (mm:ss)) ####