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
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