On Sunday, December 9, 2018 10:38:10 AM CET Georg Sauthoff wrote:
Funnily, the img2pdf author uses Debian, and Debian aarch64 zlib.compress() *does* yield bit-identical output (to x86-64). Perhaps the deviating Fedora aarch64 behaviour is due to different compile options/patches (e.g. some Neon optimization or something like that).
This is because we have downstream-only patches related to that architecture, applied/maintained by Peter Robinson and Jeremy Linton (both are in CC). It caused problems at least in qpdf, git and R components so far.
I'm not in favor maintaining the downstream patches (at least as long as upstream considers this not important enough to even react). So for now, please consult with Peter/Jeremy.
Pavel