https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88462
--- Comment #11 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> --- > --- Comment #10 from Johannes Pfau <johannespfau at gmail dot com> --- > I guess the proper fix to the alignment problem is using > 'https://dlang.org/phobos/std_traits.html#classInstanceAlignment' (or rather > the druntime equivalent) instead of Mutex.alignof + the rounding / slice > assignment fixes? Seems plausible: the current situation is nothing more than a hack to get me further along, and I've only just started reading up on D. > Regarding the ModuleInfo problem: Although ModuleInfo does have a variable > size, _flags ist the first field in the struct. So the whole struct instance > has to be misaligned for some reason? Is the minfo section aligned properly? It is: both minfo sections on libgdruntime.so and libgphobos.so are: libdruntime/.libs/libgdruntime.so: Section Header[28]: sh_name: minfo sh_addr: 0x17b834 sh_flags: [ SHF_WRITE SHF_ALLOC ] sh_size: 0x344 sh_type: [ SHT_PROGBITS ] sh_offset: 0x16b834 sh_entsize: 0 sh_link: 0 sh_info: 0 sh_addralign: 0x4 src/.libs/libgphobos.so: Section Header[28]: sh_name: minfo sh_addr: 0x6ff014 sh_flags: [ SHF_WRITE SHF_ALLOC ] sh_size: 0x224 sh_type: [ SHT_PROGBITS ] sh_offset: 0x6ef014 sh_entsize: 0 sh_link: 0 sh_info: 0 sh_addralign: 0x4 And looking at a statically linked test program (gdc283.exe), I see Thread 2 received signal SIGSEGV, Segmentation fault. [Switching to Thread 1 (LWP 1)] 0x0007c970 in object.ModuleInfo.flags() const (this=...) at /vol/gcc/src/hg/trunk/solaris/libphobos/libdruntime/object.d:1541 1541 @property uint flags() nothrow pure @nogc { return _flags; } (gdb) p this $1 = (const object.ModuleInfo &) @0x12ab33: {_flags = 4100, _index = 0} (gdb) up #1 0x0007d118 in object.ModuleInfo.importedModules() const (this=...) at /vol/gcc/src/hg/trunk/solaris/libphobos/libdruntime/object.d:1580 1580 if (flags & MIimportedModules) (gdb) up #2 0x0008ed74 in rt.minfo.ModuleGroup.sortCtors(immutable(char)[]) (this=..., cycleHandling=...) at /vol/gcc/src/hg/trunk/solaris/libphobos/libdruntime/rt/minfo.d:259 259 foreach (imp; m.importedModules) (gdb) p this $2 = (rt.minfo.ModuleGroup &) @0x12f228: {_modules = { 0x12932c <ModuleInfo for gdc283>, 0x1297ac <ModuleInfo for core.exception>, 0x129acc <ModuleInfo for gcc.deh>, 0x129ae4 <ModuleInfo for gcc.unwind.pe>, 0x12a99c <ModuleInfo for object>, 0x12aafc <ModuleInfo for rt.aaA>, 0x12ab33 <ModuleInfo for rt.adi>, 0x12ab42 <ModuleInfo for rt.arraycat>, 0x12ab56 <ModuleInfo for rt.cast_>, 0x12ab67 <ModuleInfo for rt.deh>, 0x12ab77 <ModuleInfo for rt.dmain2>, 0x12ab89 <ModuleInfo for invariant>, i.e. everything starts off alright, but goes astray from 0x12ab33 <ModuleInfo for rt.adi> onwards.
