no, the kernel infrastructure should handle that like any other
hardening flags before.
** Changed in: gcc-9 (Ubuntu)
Status: Confirmed => Invalid
** Changed in: gcc-9 (Ubuntu)
Importance: Critical => Undecided
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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:
Confirmed
Status in nvidia-graphics-drivers-430 package in Ubuntu:
Fix Committed
Status in virtualbox package in Ubuntu:
Confirmed
Status in xtables-addons 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.
WORKAROUND:
sudo ln -fs gcc-8 /usr/bin/gcc
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