The -gdwarf2 had a specific reason.
I had not looked at the recent gcc 4.1.x + binutils, but in the gcc
3.x.x compilers when you pass just -g the assembler emitted stabs debug
data on most archs. This not only made the debug object files bigger,
but also the stabs sections were not always parsed correctly in various
versions of gdb. I found the dwarf2 sections to be smaller and more
reliable to allow source level assembly stepping as well as debug frame
info through the assembly linked functions (ie better back traces).
If it is the case that the gcc 4.1.x + binutils all emit dwarf2 as the
default you can use just -g.
I'll also take a moment to mention that in the kgdb branch, I also
modified the top level make file so that you can un-optimize kernel
modules compiled outside the kernel tree. I find this this is useful if
you want to step through significant chunks of code in your kernel
module IE:
make ARCH=i386 -C KERN_SRC_LOCATION M=/my_mod COMPTIMIZE=-O0
Jason.
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