On Sun, Jul 20, 2014 at 09:23:15PM +0200, Sam Ravnborg wrote: > On Wed, Jul 16, 2014 at 01:16:12AM +0200, Andi Kleen wrote: > > From: Andi Kleen <ak@xxxxxxxxxxxxxxx> > > > > I found that a lot of unresolvable variables when using gdb on the kernel > > become resolvable when dwarf4 is enabled. So add a Kconfig flag to enable it. > > > > It definitely increases the debug information size, but on the other > > hand this isn't so bad when debug fusion is used. > > Would it not make sense to try to enable degug info like this: > First try -gdwarf-4 > If this fails try -gdwarf-3 > If this fails try -gdwarf-2 > And if this also fails fallback to -g > > We could then us a Kconfig option to enable the highest debug level - where 4 for now is the highest. > On the other hand if most people have revent utils then they all have -gdwarf-4 supported > and then it is no big deal. I made it a separate option, because dwarf4 is somewhat bigger than dwarf3 and it's probably only useful for people actively using gdb/crash (and I don't think others users like systemtap/perf probe do dwarf4 yet) If debug fusion was default it would be fine, but right now it would need converting a lot of debuginfo packaing scripts first. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
