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

[Daniel van Vugt]

linux (5.2.0-8.9) eoan; urgency=medium

  * linux: 5.2.0-8.9 -proposed tracker (LP: #1835700)

  * Miscellaneous Ubuntu changes
    - [Packaging] replace zfs and spl build with zfs 0.8.1-1ubuntu1
    - SAUCE: test_bpf: remove expected fail for Ctx heavy transformations test on
      s390
    - SAUCE: add -fcf-protection=none to retpoline flags
    - SAUCE: usbip: ensure strings copied using strncpy are null-terminated
    - SAUCE: usbip: add -Wno-address-of-packed-member to EXTRA_CFLAGS
    - SAUCE: perf jvmti: ensure strncpy result is null-terminated
    - update dkms package versions
    - add removed zfs modules to modules.ignore

  [ Upstream Kernel Changes ]

  * Rebase to v5.2

 -- Seth Forshee <seth.forshee at canonical.com>  Mon, 08 Jul 2019 07:13:41
-0500


** Changed in: linux (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:
  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:
  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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