[Bug 1830961] [NEW] 9.1.0-3ubuntu1 prevents kernel & kernel module compilation on 19.10 due to enabled fcf-protection

[satmandu]

Public bug reported:

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.

** Affects: gcc-9 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1830961

Title:
  9.1.0-3ubuntu1 prevents kernel & kernel module compilation on 19.10
  due to enabled fcf-protection

Status in gcc-9 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.

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