It is nice to see this resolved for 5.3-rc1.

Excuse my ignorance of the process, but will this patch be (perhaps
automagically) backported so the next iteration of the 5.2 (and maybe
5.1) stable kernels for amd64 and i386 also get generated successfully?

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https://bugs.launchpad.net/bugs/1830961

Title:
  Kernels & kernel drivers fail to build with gcc-9 [error: ‘-mindirect-
  branch’ and ‘-fcf-protection’ are not compatible]

Status in gcc-9 package in Ubuntu:
  Won't Fix
Status in linux package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-430 package in Ubuntu:
  Fix Released
Status in virtualbox package in Ubuntu:
  Won't Fix
Status in xtables-addons package in Ubuntu:
  Won't Fix

Bug description:
  Compiling kernels & kernel modules fails due to these errors:

  ./include/linux/compiler.h:193:1: error: ‘-mindirect-branch’ and
  ‘-fcf-protection’ are not compatible

  (This happens with any kernel modules.)

  This appears to be due to the changes in 9.1.0-3ubuntu1 enabling -fcf-
  protection by default on 19.10's gcc-9.

  Switching to gcc-8 allows compilation to proceed.

  WORKAROUND:

  sudo ln -fs gcc-8 /usr/bin/gcc

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