". ." <pkejjy@xxxxxxxxx> writes: > On Fri, Jun 5, 2009 at 5:30 PM, Ian Lance Taylor<iant@xxxxxxxxxx> wrote: >> ". ." <pkejjy@xxxxxxxxx> writes: >> >>> (In other words, I think the default for x86(-64) should be packed, >>> but I'll leave it to others to have that flame war.) >> >> The ABI can not change. Changing that now would prevent linking object >> files compiler by different compilers together safely, as they would use >> different offsets for accessing struct fields. > > Yuck -- I see your point. But, there could still be a commandline > switch to pack all structs (like -Os, but for data). No, I don't > expect anyone to actually create this anytime soon, but it would be a > handy tool for manycore optimization endeavors. The command line option is -fpack-struct. Ian
