Il dom 21 mar 2021, 16:49 Richard Henderson <richard.hender...@linaro.org> ha scritto:
> What exact version of gcc are you guys using? Something from rawhide that > I can just install? > I am using Fedora 34. I upgraded just to test this bug and it seems stable except that GNOME Shell extensions need an upgrade. However I haven't tried building all of QEMU, only the test case. So far I have failed to compile with gcc master with --enable-lto. Lots of > missing symbols reported at link time. Therefore I've been unable to > actually > test what I intended to test. > > That said, I'm not hopeful that __attribute__((const)) will work. I have > an > idea that early inlining will inline tiny function calls too soon, before > the > attribute has a change to DTRT during CSE. Yeah that's at least plausible. Another workaround may be to avoid compiling exec-vary.c with -flto. I'm > not > sure that my meson fu is up to that. Paolo? > You would have to define a static library. I have filed a gcc bug report: > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99696 > > Hopefully someone can address that before gcc 11 gets released. At which > point we need do nothing in qemu. Aldy? Good point, I can give it a shot too just to see how rusty I am... That would be the best outcome, though we would have to check LLVM as well. If const doesn't work it would indeed be prudent to include Gavin's configure check. Paolo > > r~ > >
