@Po Lu: I have just tested, your proposal and of course it works well (I've used that build version for a while). Btw, I noticed that this crash occurs ONLY for builds where -O3 and LTO are used together. On Thu, 27 Feb 2025 at 14:30, Po Lu wrote: > Eli Zaretskii writes: > > >> Date: Thu, 27 Feb 2025 12:22:36 +0000 > >> From: Pip Cet > >> Cc: Po Lu , marian.iurie@gmail.com, > >> michael.albinus@gmx.de, iura.mail@gmail.com, 76559@debbugs.gnu.org, > >> Stefan Kangas , Paul Eggert > >> > >> > >> "Eli Zaretskii" writes: > >> > >> > I believe we should recommend against using -O3. Too many bad bugs > >> > >> If we do that, can we include link time optimization in that? I find > >> LTO'd code extremely difficult to read, since things like the calling > >> convention no longer apply (even when a function call isn't inlined, LTO > >> can still conclude that some registers survive the call and reuse them > >> even though the calling convention disagrees). > > It's marginally easier to read the RTL (which ultimately becomes no more > than a Lisp-like representation of the assembly but with some tree > expressions and analogous details preserved for reference, > e.g. non-inlined procedure calls). > > > Maybe we should also recommend against LTO. Paul, WDYT about this? > > I think there is no occasion to compile Emacs with any optimization > options besides -O2. >