[Bug 1830961] Re: Kernels & kernel drivers fail to build with gcc-9 [error: ‘-mindirect-branch’ and ‘-fcf-protection’ are not compatible]

[Launchpad Bug Tracker]

This bug was fixed in the package nvidia-graphics-drivers-430 -
430.34-0ubuntu2

---------------
nvidia-graphics-drivers-430 (430.34-0ubuntu2) eoan; urgency=medium

  * debian/dkms_nvidia/patches/disable_fstack-clash-protection_fcf-protection.patch:
    - Refresh for 430.34 (LP: #1830961).

 -- Alberto Milone <alberto.milone at canonical.com>  Wed, 10 Jul 2019
15:27:36 +0200

** Changed in: nvidia-graphics-drivers-430 (Ubuntu)
       Status: Fix Committed => Fix Released

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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:
  Invalid
Status in linux package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-430 package in Ubuntu:
  Fix Released
Status in virtualbox package in Ubuntu:
  Confirmed
Status in xtables-addons package in Ubuntu:
  New

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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