Error while triyng to compile android X86 -- You are building kernel with non-retpoline compiler.

[Franco Palombo]

Hi, I'm trying to compile android x86 with a custom deconfig and im getting this error:

FAILED: /media/ffpp/ArchFranc/android-x86/source1/out/target/product/x86_64/obj/kernel/arch/x86_64/boot/bzImage
/bin/bash -c "make -j2 -j\$(nproc) -l\$((\$(nproc)+2)) -C kernel O=/media/ffpp/ArchFranc/android-x86/source1/out/target/product/x86_64/obj/kernel ARCH=x86_64 CROSS_COMPILE=\" /media/ffpp/ArchFranc/android-x86/source1/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6/bin/x86_64-linux-\"  YACC=/media/ffpp/ArchFranc/android-x86/source1/prebuilts/build-tools/linux-x86/bin/bison LEX=/media/ffpp/ArchFranc/android-x86/source1/prebuilts/misc/linux-x86/flex/flex-2.5.39  bzImage modules"
make: se entra en el directorio '/media/ffpp/ArchFranc/android-x86/source1/kernel'
make[1]: se entra en el directorio '/media/ffpp/ArchFranc/android-x86/source1/out/target/product/x86_64/obj/kernel'
You are building kernel with non-retpoline compiler.
Please update your compiler.
make[1]: *** [arch/x86/Makefile:318: checkbin] Error 1
make[1]: se sale del directorio '/media/ffpp/ArchFranc/android-x86/source1/out/target/product/x86_64/obj/kernel'
make: *** [Makefile:146: sub-make] Error 2
make: se sale del directorio '/media/ffpp/ArchFranc/android-x86/source1/kernel'
ninja: build stopped: subcommand failed.
22:44:35 ninja failed with: exit status 1
make: *** [build/make/core/main.mk:21: run_soong_ui] Error 1

what can i do to fix this

[utzcoz]

Looks like you should update your compiler: https://www.reddit.com/r/Ubuntu/comments/bn50co/how_do_i_update_my_compiler_to_retpoline/en9z7sc/

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[Franco Palombo]

i was on version 9.3.0, so i tried to update to version 10.0.1. It didn't change anything. (i've already checked that i was using gcc 10 by executing gcc --version)

it gives me the same error:

FAILED: /media/ffpp/ArchFranc/android-x86/source1/out/target/product/x86_64/obj/kernel/arch/x86_64/boot/bzImage
/bin/bash -c "make -j2 -j\$(nproc) -l\$((\$(nproc)+2)) -C kernel O=/media/ffpp/ArchFranc/android-x86/source1/out/target/product/x86_64/obj/kernel ARCH=x86_64 CROSS_COMPILE=\" /media/ffpp/ArchFranc/android-x86/source1/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6/bin/x86_64-linux-\"  YACC=/media/ffpp/ArchFranc/android-x86/source1/prebuilts/build-tools/linux-x86/bin/bison LEX=/media/ffpp/ArchFranc/android-x86/source1/prebuilts/misc/linux-x86/flex/flex-2.5.39  bzImage modules"
make: se entra en el directorio '/media/ffpp/ArchFranc/android-x86/source1/kernel'
make[1]: se entra en el directorio '/media/ffpp/ArchFranc/android-x86/source1/out/target/product/x86_64/obj/kernel'
You are building kernel with non-retpoline compiler.
Please update your compiler.
make[1]: *** [arch/x86/Makefile:318: checkbin] Error 1
make[1]: se sale del directorio '/media/ffpp/ArchFranc/android-x86/source1/out/target/product/x86_64/obj/kernel'
make: *** [Makefile:146: sub-make] Error 2
make: se sale del directorio '/media/ffpp/ArchFranc/android-x86/source1/kernel'
ninja: build stopped: subcommand failed.

23:38:49 ninja failed with: exit status 1

make: *** [build/make/core/main.mk:21: run_soong_ui] Error 1

the strange thing is that i compiled a iso_img hours ago with my "custom config"(it seems that i didnt save that one, but now i did the canges and saved them)

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[Huy Minh Bui]

Are you trying to build kernel with Retpoline to patch Spectre and Meltdown ? Then go to devce/generic/common/build/task/kernel.mk or build/core/tasks/kernel.mk (nougat-x86)

Edit this part 

> CROSS_COMPILE ?= $(abspath prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6/bin)/x86_64-linux-

to 

> CROSS_COMPILE ?=

Vào 08:50:56 UTC+7 Thứ Tư, ngày 17 tháng 6 năm 2020, Franco Palombo đã viết:

[Franco Palombo]

Seems to have worked. it didn't show me that error anymore. I wasn't triyng to build a kernel with retopline. i don't even know what is that, but now is compiling. Thanks!

[Huy Minh Bui]

Then you might want to turn it off to save up some performance

[Michael Goffioul]

According to this reference [1], you may also want to check and/or change the value of CONFIG_RETPOLINE in your kernel config.

[1] https://askubuntu.com/questions/1145943/building-kernel-with-non-retpoline-compiler

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[Franco Palombo]

But, disabling retpoline decreases my kernel security, isn't it? Or on Android that does not have effect?

[Franco Palombo]

does that image that i adjunted means that retpoline is disabled?