On Tue, 2025-10-14 at 19:16 +0200, Gregor Riepl wrote: > > > > Well, the bus error is well visible when running the xdelta3 testsuite. > > Well, the bus error in xdelta3 itself yes... but I was referring to the > autconf check. > This one _doesn't_ cause a bus error (as it should), when it's compiled with > optimization. > If it was, configure could detect it and and automatically set > ax_cv_have_aligned_access_required=yes > - which will then set a macro that disables all the code that causes > unaligned access.
Does that mean that the unaligned access is intentional? Why is there an option to disable it? > If the autoconf check script is compiled with -O0, it will cause a bus error, > which is what > I suggested as a solution. I'm not sure how to fix this script so it will > trigger the bus error > even with -Os or -O3. I'm not sure I'm following. Does the code actually trap SIGBUS to determine whether there was an unaligned access and the SIGBUS does not occir with -O0? > The rest of xdelta3 can be compiled with -O3/-Os just fine, as long as the > macro is set. And the testsuite passes as well? Adrian -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer `. `' Physicist `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
