Public bug reported:
[Impact]
linux-riscv-5.8 needs to be built with gcc-10 in Focal otherwise it won't boot.
This was fixed by commit "UBUNTU: [Packaging] Use gcc-10 for riscv 5.8 kernel
build", which adds gcc-10 as "Build-Depends-Arch" and sets a variable "gcc" in
'debian/rules', which is passed down to make by
'debian/rules.d/2-binary-arch.mk'.
The other gcc version dependency is when we generate locally the kernel
configs by running 'make syncconfig', which is called by
'debian/scripts/misc/kernelconfig'. Currently, the syncconfig is called
using the chroot default compiler, which in Focal is gcc-9. So far there
hasn't been any major differences, however with the update of gcc-10 in
Groovy and Focal from 10.2.0 to 10.3.0 some KASAN related config options
are not available anymore, causing some changes on the configs
generated. The problem with non-matching gcc versions being used, is
that there will be a mismatch between the configs being generated during
the preparation of the kernel and the ones during the build.
[Fix]
The proposed fix is to use the same variable defined for the build, passing it
down to 'debian/scripts/misc/kernelconfig' and using it to define the correct
cross-compiler to be used.
[Where problems could occur]
If the environment variables are not set correctly the build can break in some
environment which was not tested.
** Affects: linux-riscv-5.8 (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-riscv-5.8 (Ubuntu Focal)
Importance: Undecided
Assignee: Kleber Sacilotto de Souza (kleber-souza)
Status: In Progress
** Also affects: linux-riscv-5.8 (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux-riscv-5.8 (Ubuntu Focal)
Assignee: (unassigned) => Kleber Sacilotto de Souza (kleber-souza)
** Changed in: linux-riscv-5.8 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux-riscv-5.8 (Ubuntu Focal)
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1933856
Title:
gcc version used for kernel configs doesn't match the one used for
builds
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