*** This bug is a duplicate of bug 1830961 ***
https://bugs.launchpad.net/bugs/1830961
According to this comment (
https://www.phoronix.com/forums/forum/software/general-linux-open-
source/1113503-linux-5-2-1-released-for-riding-the-latest-stable-
kernel?p=1113668#post1113668 )at Phoronix, the underlying cause is:
"Ubuntu is using -fcf-protection by default now and that isn't
compatible with -mindirect-branch that the kernel uses for retpolines. "
Bug 1830961 appears to be an earllier report, so this is a duplicate of
that bug, as is bug 1836373
** This bug has been marked a duplicate of bug 1830961
Kernels & kernel drivers fail to build with gcc-9 [error:
‘-mindirect-branch’ and ‘-fcf-protection’ are not compatible]
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https://bugs.launchpad.net/bugs/1837036
Title:
Mainline Ubuntu Linux kernel builds failing for >= 5.1.17 and >= 5.2
on AMD64 and i386
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