C/C++ Cyanogenmod How to compile kernel using different version of toolchain?

Question

I am trying to compile kernel for Cyanogenmod 13. I am getting error

ERROR: modpost: Found 2 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
 To build the kernel despite the mismatches, build with:
'make CONFIG_NO_ERROR_ON_MISMATCH=y'
 (NOTE: This is not recommended)

I read it here. That i need to compile my kernel using 4.7. How can i choose the version of toolchain during cyanogenmod build ??

Answer 1

Thanks to @nopasara and his valuable comment.

So i did little research further and discovered that the kernel is compatiable with arm-eabi tool chain not arm-linux-androideabi toolchain. So here is the command i used

export PATH=$PATH:~/android/system/prebuilts/gcc/linux-x86/arm/arm-linux-eabi-4.7/bin/ && export ARCH=arm && export SUBARCH=arm && export CROSS_COMPILE=arm-linux-eabi- && make msm8226_defconfig O=~/android/system/out/target/product/E6790/obj/KERNEL_OBJ

and

 make   O=~/android/system/out/target/product/E6790/obj/KERNEL_OBJ zImage -j4

To do with this Cyanogenmod add following line to your BoardConfig.mk

  TARGET_KERNEL_CROSS_COMPILE_PREFIX := arm-eabi-

and either use

 export TARGET_LEGACY_GCC_VERSION=4.7 

Or edit ~/android/system/build/core/combo/TARGET_linux-arm.mk and set version in

  $(combo_2nd_arch_prefix)TARGET_LEGACY_GCC_VERSION := 4.7

Answer 2

I believe you need to setup gcc version 4.7 and use CC variable to set it as a compiler. E.g. make target CC=/bin/gcc4.7

More information here and here.