[Bug 1868169] Re: Cannot build nvidia driver via dkms because compiler doesn't match kernel

[Chris Newcomer]

gcc package upgraded in 18.04 and new kernel compiled with that version
hasn't been released yet.

** Package changed: gcc-defaults (Ubuntu) => linux (Ubuntu)

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1868169

Title:
  Cannot build nvidia driver via dkms because compiler doesn't match
  kernel

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Bionic:
  New

Bug description:
  The same as this issue https://bugs.launchpad.net/ubuntu/+source/gcc-
  defaults/+bug/1608753 but on 18.04

  
  relevant output from /var/lib/dkms/nvidia/440.33.01/build/make.log:

  Compiler version check failed:

  The major and minor number of the compiler used to
  compile the kernel:

  gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)

  does not match the compiler used here:

  cc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0
  Copyright (C) 2017 Free Software Foundation, Inc.
  This is free software; see the source for copying conditions.  There is NO
  warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

  
  It is recommended to set the CC environment variable
  to the compiler that was used to compile the kernel.

  The compiler version check can be disabled by setting
  the IGNORE_CC_MISMATCH environment variable to "1".
  However, mixing compiler versions between the kernel
  and kernel modules can result in subtle bugs that are
  difficult to diagnose.

  *** Failed CC version check. Bailing out! ***

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