How to upgrade gcc 4.8 to a newer version on Ubuntu 14.04 installed on my ARM chromebook

[Mario Marietto]

Hello to everyone.


I've installed Ubuntu 14.04 + kernel 3.13 + kvm on my Samsung Chromebook
ARM "SNOW" model XE303C12. Almost everything works (but not the mouse usb).
My goal is to upgrade Ubuntu (kernel and userland and I want to keep kvm
enabled). So,I've got a new kernel sources from this link :


https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.244.tar.xz


I have unpacked it and I've added at the bottom of the .config file these
lines :


CONFIG_HAVE_KVM_IRQCHIP=y
CONFIG_KVM_MMIO=y
CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT=y
CONFIG_VIRTUALIZATION=y
CONFIG_KVM=y
CONFIG_KVM_ARM_HOST=y
CONFIG_KVM_ARM_MAX_VCPUS=2
CONFIG_KVM_ARM_VGIC=y
CONFIG_KVM_ARM_TIMER=y


I tried to add those lines directly on the .config file editing the file
with nano because as soon as I have wrote "make menuconfig",I saw that the
KVM entries weren't there,as you can see :


https://ibb.co/WcXPTj5


Unfortunately those lines don't stick on the kernel config file. When I
save it and I reopen it,I see that the kvm lines have been deleted. (I'm
trying to compile the 5.4 kernel directly on the chromebook using an SSH
connection). As a second attempt I've used the kernel config file offered
by virtual open systems on their guide here :


http://www.virtualopensystems.com/en/solutions/guides/kvm-on-chromebook/


I've added the kvm entries (this time they stuck) and then I tried to
recompile it with the command :


ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make uImage dtbs -j2


and also :


make uImage dtbs -j2


This is the compiler that I'm using :


gcc --version
gcc (Ubuntu/Linaro 4.8.2-19ubuntu1) 4.8.2


but this is what happened :


root at marietto-Z87-HD3:/home/ziomario/Desktop/linux-5.4.244# ARCH=arm
CROSS_COMPILE=arm-linux-gnueabihf- make uImage dtbs -j4

scripts/kconfig/conf  --syncconfig Kconfig
  CC      scripts/mod/empty.o
  CC      scripts/mod/devicetable-offsets.s
  MKELF   scripts/mod/elfconfig.h
  HOSTCC  scripts/mod/modpost.o
  HOSTCC  scripts/mod/sumversion.o
  HOSTCC  scripts/mod/file2alias.o
  HOSTLD  scripts/mod/modpost
  CC      kernel/bounds.s
  CALL    scripts/atomic/check-atomics.sh
  CC      arch/arm/kernel/asm-offsets.s
arch/arm/kernel/asm-offsets.c:45:2: error: #error Your compiler is too
buggy; it is known to miscompile kernels
 #error Your compiler is too buggy; it is known to miscompile kernels
  ^
arch/arm/kernel/asm-offsets.c:46:2: error: #error and result in
filesystem corruption and oopses.
 #error and result in filesystem corruption and oopses.
  ^
make[2]: *** [arch/arm/kernel/asm-offsets.s] Error 1
make[1]: *** [prepare0] Error 2
make: *** [sub-make] Error 2


I tried to follow this guide because I wanted to upgrade gcc to a new
version :


https://gist.github.com/alexandreelise/192a63e287018ddfc896bbcb70b219d4


unfortunately this repo does not work anymore :


sudo add-apt-repository ppa:ubuntu-toolchain-r/test
Cannot add PPA: 'ppa:ubuntu-toolchain-r/test'.
Please check that the PPA name or format is correct.


-- 
Mario.
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