WORKAROUND:

sudo ln -fs gcc-8 /usr/bin/gcc

** Description changed:

  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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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]

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