Because GCC tool chain as below have removed from android11.

prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9/bin/x86_64-linux-androidkernel-gcc
prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-androidkernel-gcc

you can select one of below ways to fix this issue.
1.  use clang compiler as below which integrated in android11 
prebuilts/clang/host/linux-x86/clang-r383902b/bin

2. use external gcc compiler.
https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm

在2021年1月20日星期三 UTC+8 下午11:37:39<zhaozhi...@gmail.com> 写道:

> I want to build kernel for x86_64, and do as the link 
> https://source.android.com/setup/build/building-kernels tell:
> repo init -u https://android.googlesource.com/kernel/manifest -b  
> common-android11-5.4
> repo sync.
>
> BUILD_CONFIG=common/build.config.x86_64 build/build.sh
>
> Then I met this error:
> make[1]: Entering directory '/home/....../out/common'
> /home/....../common/Makefile:629: include/config/auto.conf: No such file 
> or directory
> /home/....../common/Makefile:685: include/config/auto.conf.cmd: No such 
> file or directory
> make[1]: x86_64-linux-androidkernel-gcc: Command not found
> ***
> *** Configuration file ".config" not found!
> ***
> *** Please run some configurator (e.g. "make oldconfig" or
> *** "make menuconfig" or "make xconfig").
> ***
> /home/....../Makefile:688: recipe for target '.config' failed
> make[1]: *** [.config] Error 1
> make[1]: Leaving directory 
> '/home/zzl/03_kernel/03_goldfish_kernel-5.4/out/common'
> Makefile:179: recipe for target 'sub-make' failed
> make: *** [sub-make] Error 2
>
> Does anyone knows what's the reason?
>
> Thanks
>
>

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