The origin of this bug is the change in the gcc-9 package on 26 May
2019. Shouldn't the fcf-protection change there just be reverted?
As per the changelog:
gcc-9 (9.1.0-3) experimental; urgency=medium
* Update to SVN 20190526 (r271629) from the gcc-9-branch.
- Fix PR libgomp/90527, PR c++/90532, PR libstdc++/90299,
PR libstdc++/90454, PR debug/90197, PR pch/90326, PR c++/90484,
PR tree-optimization/90385, PR c++/90383, PR tree-optimization/90303,
PR tree-optimization/90316, PR tree-optimization/90316,
PR libstdc++/90220, PR libstdc++/90557, PR sanitizer/90570,
PR target/90547 (x86), PR libfortran/90038, PR fortran/90498,
PR libfortran/90038, PR libfortran/90038, PR fortran/54613,
PR fortran/54613, PR libstdc++/85965, PR target/90530 (PARISC),
PR c++/90572.
* Turn on -fstack-clash-protection and -fcf-protection in Ubuntu 19.10 on
supported architectures.
* Fix PR bootstrap/87338 on ia64 (James Clarke). Addresses: #927976.
* Enable LTO builds on 64bit architectures.
* Update libstdc++ symbols files for gcc-4-compatible builds.
* Build the nvptx offload compiler on ppc64el.
* Build the libgomp-hsa plugin.
-- Matthias Klose <d...@debian.org> Sun, 26 May 2019 17:59:59 +0200
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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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