Kbuild: Add a option to enable dwarf4 v2

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.

v2: Use cc-option
Signed-off-by: Andi Kleen <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Signed-off-by: Michal Marek <[email protected]>
2 files changed