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Wandering Logic
Asked: 2019-05-15 14:25:33 +0800 CST

dkms failure because gcc version is newer than that used to compile kernel

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I have a kernel module that was registered with dkms. When a recent upgrade bumped my kernel to 4.15.0-50 I started getting the below error from dkms. Apparently kernel 4.15.0-50 was compiled with gcc version 7.3.0, but part of the upgrade involved installing a new version of gcc (7.4.0), which is causing dkms to fail. gcc 7.3 is no longer available on my system. How do I install gcc 7.3 in addition to 7.4, or even downgrade 7.4 to 7.3?

DKMS make.log for nvidia-430.14 for kernel 4.15.0-50-generic (x86_64)
Tue May 14 17:08:12 CDT 2019
make[1]: Entering directory '/usr/src/linux-headers-4.15.0-50-generic'
Makefile:976: "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel"
  SYMLINK /var/lib/dkms/nvidia/430.14/build/nvidia/nv-kernel.o
  SYMLINK /var/lib/dkms/nvidia/430.14/build/nvidia-modeset/nv-modeset-kernel.o

Compiler version check failed:

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

gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)

does not match the compiler used here:

cc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
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! ***

/var/lib/dkms/nvidia/430.14/build/Kbuild:182: recipe for target 'cc_version_check' failed
make[2]: *** [cc_version_check] Error 1
make[2]: *** Waiting for unfinished jobs....
Makefile:1552: recipe for target '_module_/var/lib/dkms/nvidia/430.14/build' failed
make[1]: *** [_module_/var/lib/dkms/nvidia/430.14/build] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.15.0-50-generic'
Makefile:81: recipe for target 'modules' failed
make: *** [modules] Error 2
package-management upgrade dkms

3 Answers

  1. Best Answer

    Instead of installing multiple versions of gcc you can pass the following option to the nvidia installer:

    --no-cc-version-check

    Worked for me on Ubuntu 18.04.2, kernel 4.18.0-20 and nvidia 430.14.

    • 9

  2. As per this lengthy Debian report bug enter:

    IGNORE_CC_MISMATCH=1

    before upgrading.

    • 2

  3. I was given the option, in my case, to compile anyways but the installation failed. I think I need gcc 7.3. I was wondering if there was an option with the gcc 7.4 compiler to compile at v. 7.3.

    Somebody else said you need to have the header files, but I received an error message when I attempted to add them.

    As it stands, I would prefer to have the gcc 7.3 compiler, because I don't have much need for the gcc 7.4 compiler. I was not sure how to address this.

    • 0