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John Crispin
3cf47c5c17
timestamp.pl decides whether a subdir has work to do. It scans the stamp file and the source directories, keeps the newest, and reports that the work is done when the newest one is the stamp. The scan reads the mtime through the core stat of perl, which truncates it to whole seconds, and the comparison is strict with the stamp scanned first. Two files that share a second therefore count as a tie, and a tie says that the work is done. include/subdir.mk touches tmp/.build at the start of a build and the stamp of a subdir at the end, so the two land in the same second once a build takes less than a second between them. The target install stamp is the last one of a build, roughly 0.4 s before the build ends, so it is the one that ties first: the next build then skips target/install and ships the images of the previous build. Around one build in five was affected once the build became fast enough. Read the mtime through Time::HiRes, which reports the fraction as well. Two touches around a fork no longer share a timestamp. Keep the core stat where the module is missing, which restores the old behaviour rather than failing. Signed-off-by: John Crispin <john@phrozen.org>