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. Andreas
