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

[Gianfranco Costamagna]

This is fixed in the -proposed kernel, so I don't plan to hack
virtualbox sources to drop such flag.

** Changed in: virtualbox (Ubuntu)
       Status: Confirmed => Invalid

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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:
  Invalid
Status in xtables-addons package in Ubuntu:
  Confirmed

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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