I'm working with Jacob to try to resolve an issue where D programs compiled on his Ubuntu box (in 32-bit/32-bit) error out on my Ubuntu box with "Illegal instruction". At first we thought it was because my OS was an older version than his. But he tried compiling on an older OS than mine and it still didn't work. So now I'm wondering if it may really be just like the message seems to imply: an illegal CPU instruction.
So my main question: Does DMD do anything like, say, detecting the CPU at compile time and then enabling instructions only available on that CPU and up? Or does it do anything like always assuming the target CPU has SSE2? Anything like that that could cause differences between our CPUs to result in object code that will work on one of the CPUs, but not the other? FWIW, the CPU on my linux box is i686, so it's not like I'm on some super-ultra-old i586, or anything like that.
