Here's a smørbrødliste: * Non-isolated build environment. This is just asking for all sorts of trouble (users, hostname, network access, etc). * File system t

Here's a smørbrødliste: * Non-isolated build environment. This is just asking for all sorts of trouble (users, hostname, network access, etc). * File system time stamps. * Recording times in the build process (although even gcc supports SOURCE_DATE_EPOCH since version 7). * Usage of CPU-specific instructions, e.g. -march=native to GCC.