building kernel with non-retpoline compiler

Question

I am trying to build rtl wifi driver on Ubuntu and when I use make command, it gives me this message

make[1]: Entering directory '/usr/src/linux-headers-4.15.0-50-generic'
arch/x86/Makefile:156: CONFIG_X86_X32 enabled but no binutils support
arch/x86/Makefile:245: *** You are building kernel with non-retpoline compiler, please update your compiler..  Stop.
make[1]: Leaving directory '/usr/src/linux-headers-4.15.0-50-generic'
Makefile:58: recipe for target 'all' failed
make: *** [all] Error 2

Solution 1

Change CONFIG_RETPOLINE to n.

Run make menuconfig. Navigate to Processor type and features, and uncheck Avoid speculative indirect branches in kernel.

Note that your kernel can be exposed to kernel-to-user data leaks.

Solution 2

Did you try

sudo make 

instead of make?

make gave me that retpoline error. not present with a sudo make instruction.

Comments

[tatsu]

what is your output for cmake --version && build-essential --version && libgtk-3-dev --version && gir1.2-gtk-3.0 --version && libgtk-3-0 --version ?