Fix runqemu -q, and complain about O=2

README.md

@@ -141,6 +141,8 @@ QEMU cannot be put on the background of the current shell, so you will need to o
 
     ./rungdb
 
+`O=0` is however an impossible dream, `O=2` being the default: <https://stackoverflow.com/questions/29151235/how-to-de-optimize-the-linux-kernel-to-and-compile-it-with-o0> So get ready for some weird jumps, and `<value optimized out>` fun. Why, Linux, why.
+
 ### Kernel module debugging
 
 Loadable kernel modules are a bit trickier since the kernel can place them at different memory locations depending on load other.

runqemu

@@ -10,7 +10,7 @@ kgdb=false
 nographic=false
 extra_append=''
 extra_flags=''
-while getopts a:dkn OPT; do
+while getopts a:dknq OPT; do
   case "$OPT" in
     a)
       arch=$OPTARG