https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162
--- Comment #32 from deller at gmx dot de --- Fixed in Linux kernel by declaring the extern int32 as char: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c42813b71a06a2ff4a155aa87ac609feeab76cf3