On Thu, 19 Sep 2019 12:07:54 +0200 Andreas Beckmann <a...@debian.org> wrote: > Control: tag -1 wontfix > > On 19/09/2019 05.52, Celejar wrote: > > Build fails on a Sid system, with gcc symlinked to gcc-9, running a > > kernel built on a Buster system with gcc-8. Based on make.log and the > > The kernel headers store information which compiler was used to build > the kernel, and this compiler is used for the out-of-tree modules, too. > In your case the kernel was built with (unversioned) 'gcc' and that will > be used for the out-of-tree modules, too, even if the symlink now points > elsewhere. (Official Debian kernels are built with versioned compiler > binaries (e.g. gcc-8, gcc-9) only, and the headers have dependencies on > the corresponding packages, to avoid mismatches if the default compiler > changes. (The kernel compiler is usually switched independently from the > default system compiler.) > > Therefore: Always build custom kernels with versioned compilers.
Ah, thanks. Just one question: how do I do that, and where is this documented, either in the Debian kernel handbook or in general kernel build guides? I can't find an option within the kernel config system for versioned compilers. Do I need to use environment variables? Celejar
