On Sun, 2024-10-27 at 03:08 +0000, Thorsten Glaser wrote: > > I think that's overstating the case. Alternatives to rust are available > > and will be for the foreseeable future. Most notably, > > That’s not the point. Google, for example, are aggressively funding > people to throw away perfectly working code and rewrite it in rust, > or to at least add rust to projects. librsvg has been such a case for > some time already, python-cryptography is, but now we’re losing even > freetype (!!!) and, possibly, even the Linux kernel. > > > https://gcc.gnu.org/wiki/RustFrontEnd > > That’s assuming it can build the same stuff the same way so it can > be used in packaging.
Again, it isn't just about Rust. Virtually every relevant project requires 32-bit alignment these days, including CPython. I assume that CPython is nothing that anyone here would call exotic or killing open-source, no? > https://buildd.debian.org/status/fetch.php?pkg=python3.13&arch=m68k&ver=3.13.0-1&stamp=1728344123&raw=0 > > I expect alignment assumptions like that will end up putting more > > platforms in the same predicament in future. > > No, all the other platforms use natural alignment. Yup, m68k is the only port in Debian with these issues. > > "Natural" alignment is meaningless in the context of portable data > > structures, as they exist without reference to any particular integer > > Yeah, but in practice, all we have is ILP32 and LP64; the Windows® > world has LLP64 in addition. And natural alignment just means that > all the data types’ alignment is their size. (Which kind of makes > sense, so you can read them without getting an unalignment trap on > SPARC or so.) > > > Q. What is the size of this struct, assuming baa.b is naturally aligned? > > > > struct baa { > > int a; > > long long b; > > }; > > For ILP32, LP64 and LLP64, it’s 4 (a) + 4 (padding) + 8 (b) = 16 chars. > More importantly, and relevant for Qt, struct baa is also 8-byte > aligned, and malloc(3) results are usually 8‑ or even 16-byte aligned. > Adrian -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer `. `' Physicist `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
